Thread: recomended rebuild, i have 225 heads

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Originally Posted by jrod9989

The motor has no bottom end

Yeah, I'll bet. Heads with 225cc intake runners and a Thumpr cam on a 350 with 3.08:1 gears? No surprise here.

If you start windin' that 350 to try to take advantage of those huge heads, you're just gonna start breakin' a lot of stuff. You not only need a tough bottom end, you need a tough valvetrain as well. More revs equals more Shekels.

Admit to yourself that you made a mistake and start over.
383, 9.5:1, 230-240 degree cam ground on 110 degree LSA, 1 3/4" long tube headers, RPM or Stealth manifold, 195/200/205cc heads, 3.73-4.11 rear gears, 2500/3000 stall converter, 750 vacuum secondaries carb.

One of the fellows on another forum came up with what I think is a realistic match for heads to cubic inches. He said that if you multiply cubic inches by 0.5, you'll have the correct runner size for a street/strip driver, multiply by 0.55 for a comp motor. Now, these are not hard and fast scientific laws, but they will give the average rodder a pretty good idea of where he needs to be with head choice. Also realize the the higher you go in static compression ratio, the more head you will need.