why 3.92? I am sure it isn't what you had laying around...

I bought an Ilmor supercat spec engine. It came with a 4000 dollar crank and Carrillo rods with CARR bolts.
At that point, I built the engine around the block, crank and rods I had.

I worked woth CP on a set of pistons with the proper compression height as the supercat pistons had a good sized dome on them. (Something like 12.5:1 CR)

ilmor or had those cranks made in the oddball 3.920" size in part so they could run a larger bore and still make the 510CI spec. That's what I was told by someone familiar with the program back in the early 2000's when they were doing supercat stuff.

Now to find out if my cylinder heads will support the overall power output that I desire. I know they flow pretty good to .600" shouldn't have to lift much more than that. Current cams lift to .598" and .610". Who would be a good choice for doing a valve job on my merlin 3's and mild porting? Thanks for all the input guys, as always it is greatly appreciated!

I got a good head guy for you if you dont mind driving up this way.

Sweet! I bought all my stuff from Teague over 5 years ago, coming up on 200 hrs of run time now with no problems whatsoever. We can just call this SecretFormula repower 2.0.

"If" I go the solid roller route looking at crane stock grinds. Part #138781 246/254 on a 114 with .615"/.636" looks good. I like that for the duration it has it doesn't lift a ton so should be easy on valve train.

Scrapped this build after pricing oiling system and exhaust for TRS capable of 6500 rpm..Gonna stick with the imco's and stock style oil system and keep the revs below 5500.

tyler,a 509 [4.500 bore 4.000 stroke]a crane 168741 hyd roller cam and your heads will exceed 600 hp.i just finished the same combination but it has a set of the engine quest heads.it is going to the dyno next week,i will post the results but i am expecting 625 + or - 10.

Mike, would there be any reason not to use a little more bore with 4" stroke if using the world blocks? I'm a big fan of the 4" stroke in a 9.8" deck block. Thanks for your input!

a note of caution... bowtie or dart/merlin block if you're planning to go 4.560 most gen IV/6 blocks will not sonic test acceptable for wall thickness in a marine application I would strongly suggest sonic check of any block used over 4.530 to verify proper wall thickness, I've seen some crazy chit in my years...