Posted by P and R Pete on September 29, 2008 at 15:53:19 from (205.238.236.103):
In Reply to: Re: Super A pistons posted by Vic Hayes on September 29, 2008 at 11:10:37:
Do you know the history of your heads? Would suck to find out the valves are hitting the pistons after all the work of a rebuild. I believe there's a way to check clearance with clay. I'll defer to an expert. I also wonder what would be a fair figure to assume, (from anybody?) in horsepower gain, from flat tops to firecraters? I did my SA in the Spring, new sleeves and pistons, (a ytmag kit), and kept with flat tops. I asked the advice of a friend who is a Chrysler auto mechanic. Here was my tongue-in-cheek question, and his tongue-in-cheek reply... ___________
P and R Pete: "So what do you think about swapping the flat pistons for domed? I'm thinking it will bring the original 20 horsepower up to what? Fifty to sixty??"
Mitch: "Nah, maybe 22 or 23. In an engine like this, increasing the compression ratio ain't gonna do much more 'n cause you problems. Ya can't just swap out pistons without having the cylinder bores checked for out of roundness. If after you remove the carbon on to of the cylinders where the top ring stops, you see a little groove in the cylinder wall that ain't carbon, then the engine will need bored and oversize pistons installed. The secret to more power is a straight round bore, good rings properly sealed to the bore, cylinder head gasket and valves that can hold the compression in until the cylinder fires.
I would doubt you have much wear in the cylinders. If anything, maybe a little groove on the thrust side. But yeah, we could punch 'er out .030 over, put in the high domes with file fit rings, take between .040 to .060 off the head surface, bigger intake and exhaust valves, a little porting under the valves to blend in the larger size valve into the existing runners, match the intake and exhaust ports perfectly to the gaskets, making sure not to remove any short side radius off the intake ports, put in a 480 lift cam, new intake manifold for the Holley 4 bbl, and of course a header, that should get 'er up to about 30 hp. *wink*" _________
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