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393c stroker -> RE: 400 cleveland (1/4/2006 1:06:52 PM)
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In the early 70's, I think 1973, Ford retarded their cam timing to satisfy the EPA. That along with lower compression killed the horsepower ratings of their V-8's. If you put a new timing chain in one of the early 70's engines, make sure you have one that puts the cam straight up on TDC and it makes a world of difference in the stock engine. You can find Austrailian "Cleveland" 2v heads with "quench" combustion chambers and bring the old 8.6:1 engines up almost 2 points and really wake the old engines up. The Aussie's made 302 and 351 Clevelands up into the 1980's. From what I understand the Cleveland engine is as common there as a small block Chevy is here. The "M" heads do not flow well at all as the ports, especially the exhaust are really restricted due to the built in emission passageways in the head. These heads are all stamped "M" on the top corners beside the valve covers. These heads are very prone to crack and are not performance items at all. The American Cleveland heads will have a 2 or a 4 cast on top, referring to 2v or 4v port and valve size. The only quench chambers the US made were 4v's, as the Aussie's made them in 2v. The US did make a few 400's early on that had regular "Cleveland" 2v heads on them, but that would be a very rare find these days.
393c Stroker
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