Quote: I am also considering a 4.125 crank for my fully ported SB edddie heads. What I'd like to know is would it be cost effective to replace my 4" crank 10:1 motor with a 4.125 crank and 11.5 motor? The heads aren't ideal, but would they still build more HP on a bigger CI motor? The extra compression and cubes will allow for a bigger cam. My hydraulic roller is all done at 6000RPM anyway. In my mind, a 40-50HP bump would justify the expense. I just don't know if we're at the law of diminishing returns with the eddies and these big cranks. Tom
I think you would see some gain but doubt it would be 50hp with those heads.
Quicktree Are you the one that has 360-1 heads ? I like to upgrade my ported Eddy heads on my 418. If their was a gain to them or switch to a 4.125 4.250 crank set up .
Anybody just made either change head or crank to hear true et changes not dyno numbers .
My 418 ,callies crank,compstar rods ,probe pistons,eddy headed solid cam ,seems to run good compare to what I see in a w5 headed combos or even 360-1 .
Where is gain more cubes ,more stroke ,more heads .?
Its hard to compare without hearing just the combos . Thanks Don
