Generation IV Internal Engine - What should the compression ratio be?
06-14-2010, 12:04 AM
Can anyone tell me what the compression ratio should be on a 408 with -12cc reverse dome pistons and 70cc (L92) head chambers? and what the compression gauge should read with a VTC-3 cam set up at a 105 ICL, with that compression?
06-14-2010, 10:13 AM
With a GM MLS gasket and assuming your pistons are 4.030" bore and zero deck you'll be right about 9.9:1 static.
06-14-2010, 01:07 PM
Thanks, yes the bore is 4.030, using Cometic .051" head gaskets, block was decked too, best I can remember the piston height is 0.000".
06-14-2010, 01:27 PM
Yea, with the .051" gasket it's a tad closer to 10.0:1, but no big deal :)
06-14-2010, 04:41 PM
06-14-2010, 04:53 PM
Anytime man! Let us know if we can help with anything down the road!
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