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PAC 1218's with a F13???? are they enough spring or would you go with something else?? 1518? |
230/232 and .595/.585 on a 112 LSA are the 1218's enough or would you go 1518's? Will also be swapping in a set of 243's off a c6 vette. Would like to know how much I can shave off to raise the compression a little when I clean them up and install the valve springs at the machine shop. I was thinking .005-.010??? The 243's have 64.45cc chamders stock and I would like to take them down to a little over 60cc. might need a 114 lsa to clear??? |
1218s will work fine, as well as 1518s would be even better, however I would check installed heigth. |
Originally Posted by 01ssreda4
(Post 12877519)
1218s will work fine, as well as 1518s would be even better, however I would check installed heigth. |
Originally Posted by LTX355
(Post 12877833)
it has probably been done many times but i would chose option 2 to b on the safe side;) plus 1518s will live way longer because they will always b further away from coil bind... I found this on performancetrucks.net So you want to figure out how much to mill: It takes about .005" milling of the block deck to remove 1cc of volume. It takes .007" milling to remove 1cc from an LS1 head Simple Milling Math: You have a stock 66cc chamber and you want to get down to 63cc 66-63 = 3. You have to remove 3cc's .007 x 3 = .021. So to get your 66cc chambers down to 63cc you'd have to mill ~.021. You can also do the reverse, say you want to mill a head .030 to figure out how many CC's that removes you take .030 / .007 = ~ 4.28. Milling a stock 5.7 head .030 puts your chamber at ~ 62. |
1218 = 1518 1518's are just nitrided and polished..among other things ;) They're rated .650 because the nitriding allows for higher stresses (on a spring, highest stresses are on the surface). |
Even though they may be rated to .650 I would run a double because the lobes are so aggressive..... |
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