Quote:
Originally Posted by 5851a
What model are the 400 manifolds from? Several manifold configurations that bolt to C heads. Most are to do with 2V or 4V heads and what body style. If you use 4V manifolds with 2V heads you will have a leak at the rear of all the exhaust ports
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All the 400 manifolds are 2v Cleveland size at the head. These I think are from a 77 pickup with a 400. The profile is larger, interior space is larger and exhaust exit ends of the manifolds are larger than the 351c 2v. So they should flow better than the 351c 2v manifolds being they were built to handle emissions of 400 CI instead of 351 CI. No 4v parts involved in this one except the aftermarket intake and carb.
I have a cam on the bigger end of the spectrum because engine machinist (Wheeler Racing Engines out of Blaine MN) said it would need the overlap to bleed off a little compression. The 1970 Cleveland even in 2v version was higher compression than the later engines. Allegedly 10:1 which is too high for iron heads these days without really good fuel.