Tweet
Everyone:
Looking for a bit of help here, now that I'm hip-deep in my engine build.
A bit of background......picked up a 47K mile 3400 long block and my builder has it almost completely torn down. Insides were a bit nasty with oil/sludge, but the crank tuned fairly easily.
I am building it up with a 1280 cam, and a totally awesome set of street/strip heads that Ben did for me. Flowmatched, cc match, stainless valves...the full monty. Plus a ported LIM to match. Already have 65mm TB, ported plenum, headers, etc.
Now, since I have the thing apart, do I just go for broke with a 1.00mm (.040") overbore? CR calculator says my compression ratio goes up by about 2 tenths of a point, from 9.88:1 to 10.09:1.
Or do I just wait for the machine shop to let me know the condition of the cylinder bores? I'm betting on new rings at the very least, but if the piston skirts are scratched up, likely the cylinder walls are too and it'll have to be machined anyway.
Oh, and I'm going to have the machine shop balance the rotating assembly, which obviously can't happen until we get pistons.
New 1.00mm overbore Sealed Power pistons and rings are about $350 from Rock Auto.
Thanks in advance for your opinions/advice.
Looking for a bit of help here, now that I'm hip-deep in my engine build.
A bit of background......picked up a 47K mile 3400 long block and my builder has it almost completely torn down. Insides were a bit nasty with oil/sludge, but the crank tuned fairly easily.
I am building it up with a 1280 cam, and a totally awesome set of street/strip heads that Ben did for me. Flowmatched, cc match, stainless valves...the full monty. Plus a ported LIM to match. Already have 65mm TB, ported plenum, headers, etc.
Now, since I have the thing apart, do I just go for broke with a 1.00mm (.040") overbore? CR calculator says my compression ratio goes up by about 2 tenths of a point, from 9.88:1 to 10.09:1.
Or do I just wait for the machine shop to let me know the condition of the cylinder bores? I'm betting on new rings at the very least, but if the piston skirts are scratched up, likely the cylinder walls are too and it'll have to be machined anyway.
Oh, and I'm going to have the machine shop balance the rotating assembly, which obviously can't happen until we get pistons.
New 1.00mm overbore Sealed Power pistons and rings are about $350 from Rock Auto.
Thanks in advance for your opinions/advice.
Comment