I have a few questions for you, Grumpy...
I have heard a few things about chevy main bearing caps. Maybe you can help me separate the BS from the facts.
I've been told that factory 4-bolt mains are only marginally stronger (~7-8%) than two bolts and that aftermarket splayed-bolt caps on a two bolt block are ~25-30% stronger. Is this true?
Also there is alot of conflicting info on the 400 sbc. Some claim the webbing is too weak for the extra holes on a 4-bolt and therefore, 2-bolt 400s are stronger. Is this true? And if it is, does it apply to adding splayed bolt caps to a 400? Should I abandon the 400 for a 350? I was told this engine is a '73 and it is a 2-bolter.
I have the motor out of my car (400/t56/3.90) and have been contemplating aftermarket rods and forged pistons, in anticipation of turbocharging it in the future. (I am blaming my insanity on PaulR and Turbomeister.)
I have no specific horsepower goals. I was thinking (hoping?) for 500ish hp and 600ish lb/ft. Basically, I do want to be able to bust 'em loose at 60mph.
Also any thoughts on factory steel 400 cranks? (trash? keep? test?)
Or on power expectations for a N/A 400 with only 8-8.5 compression? (smog heads and TPI. My plans are megasquirt, then better heads, then turbos. (Oh yea, insert; Buy winning lotto ticket between heads and turbos...hence my curiosity about the low CR. It is 9.8:1 now.)
Oh, and a better intake and EDIS, after I master megasquirt.
Thanks, Eric