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Its a LQ4 am rebuilding which will be bore 030 over. I'll be utilizing the original 317 heads until i can upgrade if needed at a later date. Am concentrating on a good bottom end which will include a Wiseco pro tru piston kit. Not sure which head gasket to use due to the new bore size and i'd like to be at pump gas compression ratio.
This is the WISECO piston kit specs, depending on the correct head gasket will determine my compression ratio.
With your recommendation it appears a 10.5 ratio....am good with that if this is the head gasket? GM12622033
Part Number:WISESCO-PTS523A3
Bore (in):4.030 in.
Bore (mm):102.362mm
Piston Styleome, with two valve reliefs
Piston Material:Forged aluminum
Compression Height (in):1.335 in.
Piston Head Volume (cc):-4.00cc
Last edited by Ecrod103; Nov 23, 2018 at 08:59 PM.
This is the WISECO piston kit specs, depending on the correct head gasket will determine my compression ratio.
With your recommendation it appears a 10.5 ratio....am good with that if this is the head gasket? GM12622033
Part Number:WISESCO-PTS523A3
Bore (in):4.030 in.
Bore (mm):102.362mm
Piston Styleome, with two valve reliefs
Piston Material:Forged aluminum
Compression Height (in):1.335 in.
Piston Head Volume (cc):-4.00cc
I would take that with a grain of salt. It’s likely less than what is shown due to the head gasket bore, which is larger than the piston bore and often lowers compression.
A ls9 gasket has a bore of 4.100.
Your compression is likely closer to 10.0:1 but should perform well.
Nov 23, 2018 | 03:34 PM
ome, with two valve reliefs
