Brett350
Member
In the middle of a tear down on my 383 after breaking a skirt on cylinder 4. Found out piston selection is pretty scarce for the 383. Ended up ordering the kb400s which is a 6cc dome to try and bump compression. This is what I plan on running:
1967 383 bored 30 over
Edelbrock Performer rpm intake
915 heads 78cc chambers 2.08/1.60 valves
Lunati flat tappet 226/234 @ .050 .494/.513 lift
Kb400 pistons
Had crank turned and rods resized.
Block has not been decked
Was shooting for basically 9.5-1 compression or slightly more if I can get away with it while still running 91 octane.
Seems the compression height of these pistons are lower then factory at 1.908 so taking that into account I'm hoping when I get them mocked up in the block that I will be sitting somewhere under 10 to 1. I ran numbers on a compression ratio calculator and I figure I should be somewhere close but not sure if I might be running the risk of detonation. Not opposed to running different heads or pistons if I really had to but this is what I have and I'm hoping to make this work. Any thoughts? Thanks in advance.
1967 383 bored 30 over
Edelbrock Performer rpm intake
915 heads 78cc chambers 2.08/1.60 valves
Lunati flat tappet 226/234 @ .050 .494/.513 lift
Kb400 pistons
Had crank turned and rods resized.
Block has not been decked
Was shooting for basically 9.5-1 compression or slightly more if I can get away with it while still running 91 octane.
Seems the compression height of these pistons are lower then factory at 1.908 so taking that into account I'm hoping when I get them mocked up in the block that I will be sitting somewhere under 10 to 1. I ran numbers on a compression ratio calculator and I figure I should be somewhere close but not sure if I might be running the risk of detonation. Not opposed to running different heads or pistons if I really had to but this is what I have and I'm hoping to make this work. Any thoughts? Thanks in advance.