70 455 motor
#1
70 455 motor
I have a rebuilt 70-455 motor..030 over with E heads.The machist took .100 tousandths out of the 10.5 to 1 pistons.The deck and heads have a clean up cut on them.Would anyone know what the compression would be roughly after the machining?
#4
A few things you'll have to obtain to make a good calculation: Piston to deck height at TDC, Combustion chamber volume, head gasket thickness (crushed), any valve recess or dome in the piston, Although the factory advertised 10.5:1, that was blueprinted specs with a steel shim gasket. Good luck with your engine build.
#5
So the pistons are now .135" in the hole instead of .035" stock? What brand pistons are being used? I'm assuming with the information given, it's now a flat top piston?
4.155 bore
4.250 stroke
flat top pistons (now)
77cc combustion chamber
.038 compressed gasket thickness
.135 deck clearance
9.18:1 but 8.9:1 with 80cc combustion chamber which is probably more realistic
4.155 bore
4.250 stroke
flat top pistons (now)
77cc combustion chamber
.038 compressed gasket thickness
.135 deck clearance
9.18:1 but 8.9:1 with 80cc combustion chamber which is probably more realistic
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