i have a lq4 with stock 317 heads and looking to boost up the compression. which is the best route to go mill the 317's down .30 or run with i think its 214 with the smaller combustion chamber??
i have a lq4 with stock 317 heads and looking to boost up the compression. which is the best route to go mill the 317's down .30 or run with i think its 214 with the smaller combustion chamber??
243s or mill the 317s
1969 Chevy RCLB C10 350/TH400 SOLD
2007 Chevy RCSB 4.8 4x4 LS SOLD
2008 Chevy RCSB 5.3 4x4 LT SOLD
2010 Chevy CCSB 6.2 4x4 LT SOLD
2005 GMC CCLB DRW 6.6 Duramax 4x4 191,000 and counting
2013 FORD CCSB F350 6.7 Powerstroke 4x4
which ones will flow better and make more compression and what would my compression beOriginally Posted by pl4yboy
stock 243s with stock head gaskets give you a 10:3:1 roughly
mill them .020-.025 thats 10:5:1 roughly. they flow better than those 317s
if your wanna spend 300+ on stock heads plus another 150-250 on mill work, cleaned heads an such then go 243s but id rather just mill the 317s .030 or whatever to give you w.e compression you want. be careful not to mill too much or youll have problems making your intake fit
2008 GMC CCSB 6.2/6L80e swap
Gen IV 5.3/60e swap 1994 ecsb W/T
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