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what headers to use?


machattack
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Hello, 

I'm currently having my 71 351c rebuilt. Went with a edelbrock predator intake for a holly 700 carb. Mid range cam with original 2v heads.

My question......... what headers do I use? I know nothing about headers so I could use your expert help please. The engine build is almost done so the builder will need some exhaust manifolds to Dyno test and calibrate the engine. 

 

Old manifolds are cracked in several places otherwise I would weld them up( nickle rod) and use them for the Dyno test. That would be just throwing money away when I tossed them in the garbage after the test.

Please dont be afraid to use mfg name and model #s

 

Thanks Guys/Gals!!

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I'm running same headers as Not A T5, no issues with clearance at all. They fit pretty well, and go in easy from the bottom - so really a relatively easy install. I did discover that when I went to aluminum heads, it changed the position enough I had to slightly ding a primary tube to get by the steering box (raised ports). But with stock 4V heads, they fit with no alterations. I am assuming the exhaust port is the same location between 2v and 4v.

Black 1971 Mach 1

351C/FMX/TrickFlow Heads/Lunati Retro Roller Conversion

Classic Auto AC, Manual Front Discs, Upgraded Springs/Shocks/Close-Ratio Steering

 

IMG-2977.jpg

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The hooker competition fit nice as do the Headmans.

73 Grande H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

 

- Jason

 

 

082-hot-rod-power-tour-2017-1970-1970s.jpg

 

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I just had Hooker Competition black ceramic coated headers put on this spring. Got about 1000 miles on them and still look brand new. They fit very well and don’t hang to low.

John - 72 Q Code

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Hooker Competition headers for 2V heads: 6921HKR

 

https://summitracing.com///parts/hok-6921hkr

 

 

I prefer the Hookers, as 1) they are the only sub-$500 headers that work with a factory clutch linkage for the manual transmission, 2) they fit great and don't hang too low and 3) the collector flange is welded to the header. This keeps the collector gasket from leaking, as the exhaust isn't trying to saw through the gasket every time the engine is running. 

 

If you are planning on having the engine dyno'd or need to break in the cam, do NOT buy coated headers. Using them for those purposes will cause the coating to fail and void the warranty. Buy the bare headers, do your running in and then send them out to be coated.

 

 

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I used my original exhaust manifolds to break my engine in on a test stand. Maybe you can weld up your originals or do like Hemikiller said. If you don’t want the coated headers then of course you don’t have to worry about it. But I gotta say the coated ones really do help to keep under hood temperatures down, plus they should last longer too.

John - 72 Q Code

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