Identify an FE crank
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So what is involved in finding “deck hight” and that number is how far down the piston is in the hole correct? So when you say zero the piston is even with the cyl head?
what about valve clearance here? How is that calculated? And correct me if I’m wrong but 9:1 compression is the usual max for regular unleaded standard gas right?
what about valve clearance here? How is that calculated? And correct me if I’m wrong but 9:1 compression is the usual max for regular unleaded standard gas right?
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FE OEM deck height is 10.17".
1/2 of stroke + rod + compression height of piston is the combination that must add up to be equal or less than the deck height. You can fudge it a few 1/1000s but you can't have the top ring pop out of the bore.....
Valve clearance depends on piston height vs. deck at TDC, valve lift, cam timing and a few other items.
"Zero deck" is the piston flush with the top of the block. Some pistons have domes which will protrude, but most FE pistons are flat or dished.
1/2 of stroke + rod + compression height of piston is the combination that must add up to be equal or less than the deck height. You can fudge it a few 1/1000s but you can't have the top ring pop out of the bore.....
Valve clearance depends on piston height vs. deck at TDC, valve lift, cam timing and a few other items.
"Zero deck" is the piston flush with the top of the block. Some pistons have domes which will protrude, but most FE pistons are flat or dished.
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So here’s what I know: have been learning some more about this. If I use the 390 crank, 352 con rods then to get to zero deck I can have a maximum piston comp hight of 1.740
oversize 302 pistons are an option but the comp hight for a standard 302 is 1.605. Wouldn’t have the compression lower than a standard 352?
Looks like a Windsor has close to the compression hight at 1.739
oversize 302 pistons are an option but the comp hight for a standard 302 is 1.605. Wouldn’t have the compression lower than a standard 352?
Looks like a Windsor has close to the compression hight at 1.739
Last edited by 1966F100SC; Apr 22, 2021 at 11:49 AM.
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You seem to be assuming that a piston is a piston. You need to consider where are the valve reliefs and for what size valves, what size is the piston pin, are they offset? More to it than just buying a piston.
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I may just scrap this idea all together and over bore the 352 .030 over keep it simple and save a few $
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When I looked into it many years ago I found 352 pistons to be a little pricey if you wanted any compression. Going the 390 route is probably the best as far as bang for your buck goes. You can make it a 360 as well.
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A 360 was made with long rods and short 390 car spec pistons. The piston is over .100 down the hole. Worked for Ford, but power and economy suffer. If you found .050 over 352 pistons you could probably get a 9+ CR out of those.
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Nothing wrong with that at all. Add shorty headers and you'll be able to reach into the 300+ hp range pretty easy.
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Sounds good, looked into the pistons and they are not terribly expensive, a good set of Keith Blacks .030 over run about $250, yes more than 390 but with that comes the extra machine work and crank/rods that go with that.
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