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Original Message
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| RE: Replace them with what, and why? |
| By Gerry Proctor - 12/31/2004 4:37:32 PM; IP 216.12.192.71 |
You'll get your compression with those C8AE heads. Again, those heads were used on a variety of engines including the 390GT/IP engine. They have 72 cc(nominal) chambers and you can run the numbers if you know the rest of your displaced volumes to find the true compression ratio. You'll very likely find that the factory ratio spec is a bit generous. You'll probably end up in the high nines as a true compression ratio. Though with iron heads, the tuneup gets real touchy over 9:1 on pump gas.
The heads flow just fine up to about 400 hp. The exhaust port is about .25" lower on these heads than most '66 and earlier heads which can pose some header fitment problems, depending on how you go. If you can use the manifolds that came with the heads then you're golden.
Your only other options are a set of C8OE-N Cobra Jet heads, Edelbrocks, or a set of ported heads from '65 and earlier. |
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