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08-28-2010, 11:12 PM
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78 chevy 350 heads to a.....
i have cracked 78 350 block and i want to put the 305 heads(from a 87 monte ss) cam and intake on a 92 5.7 tbi truck engine, is this posible?
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08-29-2010, 12:40 AM
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The 305 Heads are 58cc, 350 TBI Heads are 64cc Chamber. This will increase your compression ratio about .5 or 1/2 a point. May or may not require higher octane fuel. I'm not sure how the TBI computers respond to more Cr, someone will know.
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08-29-2010, 02:44 AM
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i have done this previously, i put 305 h.o. heads on a l98 engine to raise compression and it backfired. my compression ratio was ridiculously high causing pinging and the engine was sucking at higher rpm's. i would get smaller chambered 350 heads.
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08-29-2010, 05:53 AM
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The SSMonte HO305 Heads also have smaller Intake valves @1.84"
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