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#1
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r raise my compression "help" ' help
the car,a 68 charger.The motor 74 440.I built the engine about 2years ago.I installed a summit engine kit in it had trw pistons at about 9:1 comp. If anyone knows the exact advertised comp. that would help. I think it's 9.23:1 but I'm not sure. I ordered 10:1 but they sent me the 9:1 I wanted to get the motor together so in they went,now I wished I'd waited.I want to raise the comp. as much as I can without pulling pistons.What changes can I make,and about what can I expect from each change. I have 906 heads and I don't think they have been shaved. How reliable are those .020 head gaskets? Brian addressed this a while ago but I can't find it,I know you guys can help thanks.
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#2
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whats the part number on them trws??? if there 2266 you have more like 8.1 if their 2355s you would have close to 9.8.. if their 2266 mill the heads 60 and use the steel M/P head gaskets, they work just fine... but dont spay them with n2o... you need felpro 1009s for that........
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#3
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Lee do you know what kind of gains I'd get?I don't have the numbers on the pistons but I'm going to look.
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#4
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1967 915 Heads will raise the compression as they are a closed chamber head.
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#5
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If you can measure the distance the piston sits below the block deck at TDC, then we cam probbly estimate compression ratio a bit easier. Knowing the head volume we could probbly tell you fairly accuratly the compression ratio when using different gaskets or milling the heads.
Other options are milling the block, or offset grinding (stroking) the crank will also increase compression. |
#6
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sundrop ... 60 off the heads with 19 thou steel head gasket will get you close to one full point of compression.... about the same as adding 67 close chamber heads.....Lee....
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#7
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Im going through the same issue,my 440 checks to have 145 PSI cranking which works out to 8.75-8.9.This was with the.040 head gaskets.We calculate that the .020 gaskets will go approx.to 9.15-9.24 or 160-165 cranking psi.We at this time will wait to see what our deck is and possibly cut the heads as well since we want more cr with our 292/509 cam change.
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#8
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Lee, this may sound stupid, but when you say 1 full point do you mean 8:1 to 9:1? Or 8.2 to 8.3????
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#9
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Quote:
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#10
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Thanx alot guys, if I can get one full point, thats enough for now!!! (awhile anyway) I can put my money elswhere for performance rather than pistons.
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