Head Gasket question
#6
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.
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#8
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
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; 11-23-2018 at 08:59 PM.
#10
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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
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.