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12-21-2015, 12:01 AM | #1 |
Registered User
Join Date: Aug 2011
Location: Lebanon TN.
Posts: 20
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Question about raising compression ratio
I built a 77 454 .030 over, 781 heads 3 angle valve job, port mached and cleaned up. Stock bottom end, 870 street avenger carb.
Lunati 60203 cam. The pistons have a 10 cc dome and heads and block have been milled to true up. I have not driven the truck it is not road ready yet but, I have ran it a lot. After thinking about it I should have went with the 30cc dome Pistons because I don't even think I have the recommended Minimum compression ratio for the cam I am using. I built the motor a few years ago and I have no idea what I was thinking when I went with the 10cc pistons. My question is would it be worth it to put a set of the 30cc dome Pistons in. I could do for less than $500 and it would be a lot easier To do it before I put the front sheet metal on. I don't detect any issues with it now just wondering if it would be a substantial power increase with higher compression ratio. Thanks Jim |
12-21-2015, 11:39 AM | #2 |
Registered User
Join Date: Apr 2014
Location: Sumrall, MS
Posts: 381
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Re: Question about raising compression ratio
Just change the heads. Go down to a smaller cc in the heads and get some aluminum ones while you are there. It will wake it up. It will cost a little more but you won't have to pull the engine. Jmo
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1967 c10 3OTT with R10 overdrive. 385 Stroker, 373 posi FITECH EFI, Vintage air, York 210 OBA, 4/6 drop with riddler 20x8 and 20x10 1957 S5T Leslie Supertyfon train horns and EMD bell "No bolt left unturned" |
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