I am doing a simulation with desktop dyno and have looked all over for stock specs on the 88 351w. I know that it has a 8.8 to 1 CR and that it has 69cc combustions chambers. But for the life of me I cant find out what the stock gasket bore is, the gasket thickness, the deck clearance (top of cylinder to top of piston @ TDC) and whether or not the stock pistons had any kind of dish or were flat or even domed. I need this info for the simulation. I fudged the numbers so that the CR came out to 8.8 to 1 but I dont know if this is ok or not. Also, I was wondering about the opinions on my combo. I put in the sim that I would have edelbrock performer RPM heads with a roller cam that has a lopy to moderate idle, 700 CFM carb and a edelbrock performer intake. When I go to the high rise edelbrock performer RPM intake and the same carb and everything else, the HP and torque drop like a rock. Why is this? Is it because you need a higher CR to take advantage of it? By adding the RPM heads with 60cc chambers, it bumps the CR up to 9.64 to 1 with stock bottom end. This ends up putting out 470 HP @ 6000 RPM's and 449 ft*lb @ 4500 RPM's and still maintains 340 ft*lbs at 2000 RPM's. Is this a bad idea with stock bottom? The motor has around 30-35k on it. Thanks for any input.

Ryan C

 

my guess on the intake is that its for high rpm and isn't matched for the combo. i don't know the specs but i give give a general idea. head gasket thickness .038, head gasket volume 8.14cc, total clearence volume 91 cc, deck height clearence .0475, compresion height 1.739, and those are very rough ideas. They are for a 1972 351w. Its guaranteed to be off but its something to work with.

 

was looking at some other stuff and stock compression is 8.3 to 1. compression height of 1.739 again, piston/deck height .035. so this combined with the head gasket thickness and volume should work. nevermind the total volume of upper post since the 1972 had 61cc chambers.