Quote:
Originally Posted by Fast355  The Aluminum heads have a different intake bolt angle on the middle 4 bolts. The cast iron heads swap right over. ...
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IIRC the later version of the 113 heads (1987+) have the same middle bolt angle as the iron heads. So those heads would be a bolt-on swap onto the LO5 ... but they won't flow that much better than what you have now,
stock vs stock. Ditto for the 083 iron heads from the Fcar L98 (identical bolt pattern to your 193 heads, not much difference in flow). So the gains in power in using the 113 aluminum heads won't be much due to airflow, and as Fast355 said, the CR will probably be too high for a heavy car (more easily loaded engine at all speeds). So the biggest benefit in using them is the weight reduction.
IMO and in a thift sense, using 1.6 stamped rockers, keeping your L98 cam, adding duals and CAI is where you should start.... followed by DIY ECM tuning. That should yield 240+ fwhp. If you ported the heads you have and did nothing other than those mods, you'd gain another 30. That would be a combo quicker than a stock 3.08 LT1 Impala SS. HTH.
