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Car Craft did an article a few years ago on a 700hp big block Chevy. They tried 7 different sets of headers and found that even the smallest header ( 1 3/4 ) was within 30 hp of the 2 1/8 headers. The 2 1/8 headers were dyno specific headers the had 3 inches of straight coming out of the port...

I measured it 4.350 bore 3.38 stroke .041 head gasket 86 cc chamber (actual measurement) .080 piston depth (another actual observation)

I had an identical motor to what your proposing in my 68 Road Runner with a 727 and a 3.55 rear. The short block was an NOS crate motor from Mopar and I put refreshed unported 906s on it with a TM6 and a 750 DP. It had a 2200 stall and the car was fully restored on BFG radial T/As. It ran a best...

My Swinger had a 7 1/4 in it for a year behind a 400 horse 360. It had 205s on it and ran 12.90s with no traction. It had 3.23s in it and i eventually broke it. Total hamburger when i took the cover off, it look as though the carrier broke. My friends and I still laugh hysterically at the...

Lol! Good luck it should sound and run great.

I would remove the inner springs, your right. I had a comp 306 magnum solid flat tappet go flat and I had done everything right except remove the inner spring. I would also use the zinc/sulfur additives that are out there. Flat tappets aren't what they used to be and need all the odds stacked in...

Are to talking about valve spring retainer to valve guide clearance? Piston to valve clearance? The only way to know is to measure as all motors are different. Inner spring needs to be removed for break in with todays junk parts and oils. I learned that lesson the hard way. With cams this big I...

I would go with one of the 440s he has at his disposal. Leave it stock as can be and put a pretty big cam in it. I would put some money in the heads. Mill, valve job, etc. Then I would pick up a set of used 440 Hooker fenderwell headers, last set I bought were $75 dollars. He could also go the...

I would check with TTI or Proparts or Schumaker.

What bore and stroke to achieve 512?

IMHO You can run 10 to 1 on pump gas all day long.

Turbos are awfully tempting as a quick and easy fix for low HP. Anyone that has owned a turbo car, other than a factory one, is a major undertaking. Seems easy at first but it really requires a lot of engineering to get it right. Turbos have their advantages but you have to pay for it. A kit...