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Original Message
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RE: Please read this slowly and carefully. |
By Ed - 12/13/2001 8:56:53 PM; IP 64.12.105.158 |
Hey Guys - lets not get into a battle over this - I dug out a old original 428SCJ piston (which is the same compression height as the 410 per the my Ford Muscle parts supplement #1) book along with a original 390 Ford piston and slid a wrist pin through the pair. The top of 390 piston is .100 taller than the top of the 428 piston. Assuming I'll be using a 428 crank (3.98 stroke) and if I use a 390 piston, at TDC the piston will protrude above the deck by approx .100. The pin location in a 410/428 piston is .100 nearer the top of the piston as per the Muscle parts book. The way I see it I'll need a 410 piston if I use the 428 crank in the 390 block. I think the point Royce is making that its OK to use a 410 piston with the 390 crank in the truck motor, but the deck height clearance will be approx .115-.130, resulting in a lower CR which was acceptable in the era of smog motors. Thanks to all for your suggestions - Maybe its just easier to find a good 428 block! Lets all play nice! Ed |
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