there seems to be alot of 318 which are 3.91 bore being bored to 4.00 which is .090...

a 340 is 4.040..you will need another .050 for a total of .130....that is ALOT.

If you want to bore that 318 larger then say .040...you should find a machine shop that can sonic test the thickness of the cylinder walls to determine how much of an overbore you bore can take safely ...

Last edited by 70AARcuda; 02/20/10 10:50 PM.
Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)