Amc dogleg heads. Fender Exit Header Build Kits: AMC Dogleg Head V-8.

Amc dogleg heads Quote Reply Topic: 390 square port heads verses dog leg heads Posted: Jan/14/2017 at 2:11pm I have one 390 square port head and a set of 401 doglegs and looking to future build witch head flow better square port or the dogleg heads I have run dog leg headers on square port heads. May 24, 2022 · Indy Cylinder Heads makes two different aluminum heads for AMC packages. If you use the cast iron manifold, you'd be better off re-drilling the late heads for the early manifold. Product features on this system includes: Made for the AMX, Javelin, Rebel Machine, and other related platforms Designed for the dog-leg style port that works with Edelbrock or factory iron heads Flanges are 3/8 thick and CNC machined to clear the spark plugs and head bolts Excellent tube routing for a great fit and to maximize performance Hand Let's make this simple. valleyhead. Some of the heads in the 72 ish time frame did have dog leg ports and rocker studs that made using roller rockers easier, and in that time fame there were 55(??) cc camber heads also, I don't remember the combo's that were made or pre 72 exact years, as they are to hard to find I heave read where several people have used dogleg port headers on rectangular port heads. Jun 12, 2019 · In 1968, he got a call from AMC, and in 1970 the dogleg head would become the only head available for the new larger-displacement (with a taller deck height) AMC V-8. Replaces cracked, warped, or damaged originals; All-new heavy-duty high-flow castings patterned after originals; T-304 stainless steel exhaust manifold bolts and steel air injection plugs Fits all 1970-91 AMC 304, 360, and 401 V-8 engines with dog-leg port cylinder heads Remflex Exhaust Gasket 1001; Graphite, Dog Leg for 70-93 AMC 304/360/390/401 (For: AMC) Opens in a new window or tab PerformanceParts - Right Parts, Right Price, Right Away I found a set of AMC dog leg Heads Casting #3216090-1 ready to go for a good price. 500” lift), 0. Made for the AMC V-8 engines with rectangular port cylinder heads Premium 100% T-304 USA made mandrel-bent 18-gauge stainless steel Available in 1-3/4”x3", 1 7/8"x3", or 1 7/8"x3. 740 Rectangular Single, Special from Crane Engineering AMC 327 engine is from a completely different design. 022" for fit up? On early vs later dogleg heads the nominal improved flow of the later model heads over the 1970 heads is so small that it would be difficult to offset the power drop from the lower compression. I have 2 68/69 390s with dog-leg heads. ) P/N 7530 RPM Air-Gap AMC (non-EGR, for 1970-91 304-401 c. d. All AMC v8's went to the dogleg head in 1970. So with the '70 heads on the '69 390 block I will need to elongate the center mounting holes and face the manifold flanges 0. I have a set of nascar heads that have been welded and had the bolt spacing widened. Both heads have the superior dogleg exhaust port and studded rocker arm mounts. If you use square port gaskets, the headers will leak because of a void right at the dogleg. 60" valves in the 304 cylinder heads and hope that we can get the flow numbers to come close to a stock 360/401 head. Iron head has the same issue and the Trap heads have the exh. 65-inch exhaust valves. bolt spacing widened. And if you unshroud the valves in the 1970 heads then the difference is reduced to almost nothing. Rare, let you decide: 390 68-69, 50. It also offered screw-in studs. Pretty simple, all AMC V8 360/401 heads were ~ the same after ~72(ish) all were dog leg, and had 58(?) cc cambers. The idea is to use the chevy 2. Square port and dog leg heads have basically the same intake port location and size. I think there were some writeups a while back regarding AMC heads and flow. At lower rpm's there is almost no difference in power. You would not be restricting the exhaust flow with a 290 and 2-1/2" pipes bolt right up to the freeflow flange. The ported dog legs that I will be using flow 168 cfm with no stub. The heads are designed with the “Dog Leg” exhausr port. This header build kit has everything you need to bring that Fender Exit AMC Dogleg custom header together. Any dog leg port head will fit free flows. The name of his shop is "Valley Head Service" 818 993-7000 www. What you lose in compression is more than made up for in flow. These heads were proven to flow 20% better on the exhaust side than the 1966-1969 rectangle port heads. This is not to say all racers used the rectangle port heads, you had to be someone in the inner circle. 660” max lift, 354 lbs/in Stock stamped 1. And then I cut the piece of the flange that connects the 3 sets of ports. On the 290 2-1/4" pipe is likely a better size depending on the HP you can produce and should definitely go down in pipe size after the mufflers to keep the Made for the AMC V-8 engines with dog leg port cylinder heads (manufactured from1970 & newer) Premium 100% T-304 USA made mandrel-bent 18-gauge stainless steel Available in 1-3/4”x3", 1 7/8"x3", or 1 7/8"x3. Oct 17, 2012 · i will find out on the second set, the first set are 291 Oct 19, 2005 · There are Indy and Edelbrock heads available for the AMC, but Tichnerwanted to use the stock dog-leg heads. Designed to fit the AMC 304, 348, 360, 390 & 401 engine with the dog leg head. It fits the port reasonably well. In other words if your intake side is equal to or less than the capacity of the rectangular port heads then doglegs will make little if any improvement in performance. More information in pictures. Head is assembled with 2. Basically, there are two different design cylinder heads — before and beginning of 1970 and up. Casting #3196291, are suppsed to produce the best flow rates, and are a 70 Head used on the 390 I beleive, however they are still a Dog Leg port and hard to find. 025 1. Is a conventional type intake gasket (see photo) a good template to use for determining where to slot the two center holes on the underside of 1968 intake. Mar 9, 2020 · With the number of cracked 360/401 cylinder heads that I have been finding lately, I thought I would try to use 304 heads with bigger valves in them for the full size Jeep 360's that I build. Fender Exit Header Build Kits: AMC Dogleg Head V-8. etc. Good, well not as good as the dog leg. 5" sizes NASCAR style merge collectors & scavenger spikes 3/8” flanges are CNC machined to clear the spa Oct 13, 2003 · It's been rumored that the "dogleg" port heads flow a little better. Oct 17, 2012 · i will find out on the second set, the first set are 291 --All Dog Leg Exhaust Port Heads use 1/2 inch Head Bolts and move the two inner intake manifold bolt holes closer together. Sep 24, 2000 · AMC Cylinder Head History When the AMC V-8 first appeared in 1966, it had square port heads. They changed out the camshaft or camshaft and rockers to something like 0. They have a hybrid head, which is a 440 Chrysler cylinder head made to fit an AMC block with a Chrysler exhaust flange pattern. a set of untouched 3196291-c heads (52cc dogleg heads made in 1970). And unless you use 291C heads lower compression may offset any potential gains from the heads. all come into play. Personally, I wouldn't change valve size. 10-inch intake valves and 1. The other major engineering change in 1970 was the upgrade to the famous “dog-leg” heads. There are 2 desirable subtypes of AMC V8 heads. The AMC techs realized in 1970 that they could open up the runners a little and greatly increase flow. 60 valves and an 185cc intake volume. All heads including the 3196291 were $100 per pair. I did it on my 290 Javelin many years ago and the headers sealed OK for me using dogleg gaskets. 025”, 30 degree seat, 3/8 stem Exhaust valve: 1. of 1970, being an automatic, I don't remember EVER using the emergency brake. That's 5 years after the dog leg became the standard production head. Back to the dog leg heads and manifold matching for a minute I like the concept of the air gap manifold, especially since the average day temps in Woodland Hills, CA are around 80F. , Inc has the most complete header builder kit on the market. The two critical reasons for the flow increase were that the area of the port is larger, due to the dogleg and second, and the shape of the port Oct 8, 2003 · Early heads (Pre 70) were not Dog Leg Ports, 70 and up (Late Heads) were Dog Leg ports. But I might just stick with the square port heads for now if im going to have to machine a intake to fit the 343 with dogleg heads. It’s more like the original head with a dogleg exhaust Feb 22, 2016 · Heads: Cast Iron AMC dog leg, late model Intake valve: 2. also the heads do have the x cast into them. Also, the later heads have 1/2 head bolts and the earlier Stainless Headers Mfg, Inc. I'm considering the dogleg heads myself and picked up a 1968 390 intake, so it sounds like the same mating concern as for the OP. Hedman is one, I have never used them but I know that others here have. This is information widely available on the internet and not of my own research. So you have to decide if you want a noisy performance car, or a quiet and civilized cruiser. I have a '69 AMX with a 390 / 4spd and on the Hot Rod Power Tour I talked with an Edelbrock Tech about using their shorties on my '69 heads. i. There is some loss of flow running rectangular port headers on dog-leg heads, but unless you're racing there isn't a significant loss. Pontiac even machined their combustion chambers for years and were still 2 or 3 cc's off. Use the 993's. ok here's the next part, the block casting number is 3190806 which should be and is a 7/16 head bolt block. 60 CC, 2. The cork in their design is theintake runner and the exhaust-port-to-header match Mar 6, 2014 · The whole point of this was to continue on with the S/S models’ competitive edge by running the cars with new AMC dogleg heads. (Compiled by Clark Rempel; as reprinted in the April, 1998 Alamo AMC News) Flow much better than rectangular ports. 650 stainless steel valves, chrome moly steel retainers, 7/16 studs, 5/16 guide plates, seals and bronze guides. Made for the AMC V-8 engines with dog leg port cylinder heads; Premium 100% T-304 USA made mandrel-bent 18-gauge stainless steel Available in 1-3/4”x3", 1 7/8"x3", or 1 7/8"x3. It fits a rectangular port very well, but of course does not match the dog leg head. I ported/polished the 360 dogleg heads on my 360 and there was definitely a difference in the engine from the get-go. The only exception in square port heads would be the 1969 Crane AMX/SS 390 heads- those are bad-ass, if not the best flowing head ever made from the factory. All stock AMC and aftermarket intake manifolds will fit. Plenty of intake options, here are a couple to kick off with: RPM Air-Gap AMC (non-EGR, for 1967-69 290-390 c. 1968 amx with dog leg ports on 360 engine, I need your advice on what headers to get that fit They build them to whichever head (square or dogleg) that you Header #3: 1 3/4 dog leg Hooker pn 7105. 6 and 1. Likely 090's but not positive. Above is a modified port and a stock port. The dog leg exhaust port heads are much better and flow about 50% more air than the square ports. You will see the ports on the Edelbrock heads are smaller in size when compared to the 291-c heads in some areas, larger in others but offer a smoother port. Great for building that set of fender exit headers for any roadster, racing, or performance application. Use a new steel valley pan gasket as a template. Great for building that set of headers for your AMX, Javelin, Matador, Ambassador or Rebel. --Pivot Rocker Design Heads use a hemi-spherical shaped washer on a 7/16 I would use the early 304 Dog-Leg heads along with the Free Flow manifolds or headers. At the Westech flowbench with a 4. The 291C heads are dogleg and do need a few things done to make the fit, you will need step dowels to locate them since they take larger 1/2" head bolts, the middle intake bolt holes won't line up with the corresponding holes in the heads, hence the need to either slot the intake or drill and tap additional holes in the heads and you will have to change over to dog leg exhaust manifolds or Here is a free-flow Dog leg port exhaust manifold kit for your 1970-91 AMC V8. These were on Craigslist, along with a couple of other AMC heads he was selling. The casting number of those heads ends with 291-C and they are one year only for the 1970 390. 390, 401 crankshaft, dog leg heads, flowed 279/210. Makes them more flexible and easier to match up bolt holes, and makes access to the spark plugs easier. I believe there is a forum member making big tube headers for AMC, but I don't recall which one offhand. Feb 19, 2010 · Even the performance book AMC printed in the early 70s states that the dog-leg head exhaust port flows "50% better" than the 66-69 343/390 rectangular port head, but someone was smoking something that day! The port is no more than 15% bigger. This placed a "notch" in the exhaust port, and they were called "dogleg" heads. You could always weld up the dogleg in the flanges, but several have reported running dogleg headers on rectangular heads with no issues, and vice-versa. The other cylinder head Indy offers is more stock, in that it uses AMC exhaust ports. So I guess the answer to your question is you couldn't simulate the trapezoid shape unless you moved the header flange hole over about . Dec 17, 2007 · They are an aluminum design using an exhaust port similar to dog-leg heads you've heard about with 2. See why Stainless Headers Mfg. Was that before or after letting the emergency brake off Mike? Alex, since I purchased my 69 AMX brand new in Jan. Sep 24, 2018 · Indy Cylinder Head has two AMC performance aluminum cylinder heads available. Head casting numbers will let you identify what kind/where a head came from. Header #5: 1 5/8 rectangular Hooker pn 7104. 5" sizes; NASCAR style merge collectors & scavenger spikes; 3/8” flanges are CNC machined to clear the spark plugs and head bolts I was speaking to owner named Larry Ofria about doing work on my 390 amx. 680”, 45 degree seat, 3/8 stem Springs: 121 lbs seat, 298 open (0. Designed to fit the AMC V-8 dogleg heads. The problem was NHRA wasn’t having it. It fits the port absolutely terrible, way smaller than the port exit. Jul 13, 2003 · 1969 and earlier AMC V8s used square exhaust port heads and those heads pretty much suck. Image Contributed By: Tom Larson. 150 bore, they Typical stock exhaust flow for an iron dog leg AMC is about 155 cfm with no stub, so stock manifolds are well designed for stock heads. » AMC, ALL AMC V8s: DOGLEG HEADS Products for: Engine Make: AMC; Engine Family: ALL AMC V8s: DOGLEG HEADS Heck, even Edelbrock heads rarely match up to their advertised specs. com He said that he and his staff helped design and build the dog leg heads for AMC when they were trans am racing. 625 Rectangular Single, 390 69 SS/AMX 58. He said that Amc had retired one of their engineers and this engineer was living You could also think about dog leg freeflow cast manifolds on the 290. 580" lift, bumped up compression and ended up with a 500 HP engine. The larger chamber heads can be found down right reasonably priced. 100 x 1. 200 Edited by Hurst390 - Mar/08/2015 at 7 This header build kit has everything you need to bring that AMC custom header together. The vendors make stepped dowels to position the head and you can use 7/16" head bolts. The 401-SR heads are offered for street applications and feature 61cc combustion chambers, 105cc exhaust ports and a 235cc intake port. AMC Dog Leg Heads - Car Engines & Engine Parts - Odessa, Ontario | Facebook Marketplace Going to loose some compression vs the original 51CC heads, and there's no advantage to running dog leg heads unless you tailor the camshaft intake and exhaust lift and duration to take advantage of the exaust port on the later heads otherwise it's going to be a wash as far as performance, as tuning can be done to take advantage of the higher I wouldnt, there are other companies that make headers with the proper shape port for the dogleg heads. Valve seat wear, valve face wear, valve head shape, casting variances, machining variances, etc. did AMC raise the deck height on some of the late 7/16 head bolt blocks. No, the manifold doesn't have to be milled but you will have to elongate the center 4 mounting holes to match up with the 304 heads. 68/69 390 heads will not fit because the ports are square rather than the 1970+ dog leg ports. The engine only made 322 HP, wasted $$$. but with the heads bolted on the block the narrow (68-69) intake is too narrow. Not really an issue that "limits your options". The total number of rectangle port heads bearing "dog leg head casting numbers" will never be know, AMC employees suggest 2 or 3 groups of 24 to 48 may be the numbers. FYI, in 1970+ motors the 360 and 390/401 heads are identical, at least in 4 barrel applications. Hi All, On the 3196291 heads, I was ready to hop in my car and buy them, but the seller got back that he had already sold them. But the real reason the prices are high is that this is the head the restoration crown needs for their 1970 MD Javelins, Javelin, The Machine and AMX. 6 rockers (roller rocker upgrade next winter, both 1. The heads are offered bare or assembled with stainless steel 2. ) P/N 7531 Torker for the early engines 2935 Torker for the later engines 2930 I gained about 10mph in high gear by installing dog leg heads and an R4B manifold on my otherwise "stock" 69-390 AMX. The 993's will be more pump friendly. roll 10. 7 ratio are available) Head flow: Lift / Int / Exh In a nutshell, the smallest combustion chamber offered in a "dog-leg" cylinder head for 360-390-401 was the "291" cylinder head for the 1970 application. Mounted a 1968 intake manifold on 401 dog-leg heads on a 1968 390 block. Cylinder heads produced from 1970 have a dog leg exhaust port while 1968-69 cylinder heads have a rectangular exhaust port. Header #4: 1 5/8 dog leg Hedman pn 98310. 02" / 1. 5" sizes NASCAR style merge collectors & scavenger spikes 3/8” flanges are CNC machined to clear the spark plugs and head bolts Hand p Also, maybe just me, but I would match the exhaust header to the heads (rectangular to rectangular, dog leg to dog leg). 02/1. The 1970 to early-71 heads with 51cc chambers (casting number 319-6291), and the mid-70 to mid-73 58cc heads (casting numbers 321-2993 and 321-3948). Any dog leg head will fit on the 360 block. Yes they can. Contrary to popular belief, the rectangle port heads are not junk. One of the posts above someone said they ran free flow dog leg manifolds on their square port heads. You will need dog-leg exhaust manifolds or headers, and the 2 center holes on each side of the intake manifold will need to be slotted, or the heads drilled and tapped for the earlier manifold. 080 1. Year, body style etc is unimportant. Intake volume is 235 cc with a 61 cc combustion chamber. One was from the writeup on the AMC V8 oil bypass mod. As expected the center two holes on each side do not line up. Jan 1, 2005 · Factory dog-leg cylinder heads flow better out of the box than most competitors, and if one used a closed-chamber 401 head on an earlier 343, and fly-cut the pistons for piston-to-valve clearance AMC Dog Leg Heads from a 1973 Javelin 401 engine. Check the head flow comparison chart elsewhere in this AMC v8 Repair site. In short, all 1970+ AMC heads are externally identical and fit the same intakes, free flows, headers etc. 00 CC, 2. Nov 2, 2006 · Here is a set of Edelbrock Performer RPM heads for the AMC V8 vs. cyblvob caqkcoj skim fqekn yymi dszd ydve uiruot dgfpohd wikvhiz