351W Compression Ratio

02-16-2001, 01:10 PM

I have a '69 351W with stock heads (I need the Performer RPM heads BAD, but no $$$), a Performer RPM intake, a 750 Edelbrock carb, a Performer RPM cam/lifters/valve springs. I need to figure out about what my compression ratio is. Do any of you have a guess? I'd also like to know about what my horsepower is at the flywheel and what it is at the rear wheels. If possible, I would just go to a dyno somewhere. But there is not one in the town I live in and I have no clue as to where the closest one is. So I'm kind of stuck. Any replies would be greatly appreciated. Thanks everyone.

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'69 Coupe with 351W
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Edelbrock Performer-RPM intake manifold, Edelbrock Performer-RPM cam, Edelbrock lifters, Edelbrock 750 cfm carb, Accel coil, Moroso Blue-Max spark plug wires, Hedman headers, 2 1/2" pipe, glasspacks, Edelbrock double roller timing chain, Edelbrock valve springs, Flex fan, C4, Lakewood traction bars, 3:1 open rear-9" 3.89:1 posi coming this summer
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Mach 1 · 02-16-2001, 01:59 PM

compression ratio isnt something anyone can tell you. there is a formula for it, with many variables involved. Im sure you could find it on the web. Try corral tech info. i think they have the formula.

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1993 GT/AOD
'93 Mustang GT

pro88 · 02-16-2001, 10:23 PM

I have a '69 Windsor in my '88 and I did a lot of research about these motors. What I found was the 2 bbl motors were 9:5.1 comp. and the 4 bbl motors were 10:7.1. Mine started out as a 4 bbl motor and I had the 1.84 / 1.55 valves in the heads with flat top pistons. That's how I knew it was a 4 bbl motor. My Windsor is now .030 over with forged pistons, ported/polished stock heads, screw in studs w/guideplates and a .536 - .293 solid lifter cam. I'm running a victor intake with a 750 double holley. Runs excellent. 11.40's so far in the quarter with 2500 stall, and 3.73 rear gears.

02-16-2001, 01:10 PM	#1
BennyBoy Guest Posts: n/a	351W Compression Ratio I have a '69 351W with stock heads (I need the Performer RPM heads BAD, but no $$$), a Performer RPM intake, a 750 Edelbrock carb, a Performer RPM cam/lifters/valve springs. I need to figure out about what my compression ratio is. Do any of you have a guess? I'd also like to know about what my horsepower is at the flywheel and what it is at the rear wheels. If possible, I would just go to a dyno somewhere. But there is not one in the town I live in and I have no clue as to where the closest one is. So I'm kind of stuck. Any replies would be greatly appreciated. Thanks everyone. ------------------ '69 Coupe with 351W ========================= Edelbrock Performer-RPM intake manifold, Edelbrock Performer-RPM cam, Edelbrock lifters, Edelbrock 750 cfm carb, Accel coil, Moroso Blue-Max spark plug wires, Hedman headers, 2 1/2" pipe, glasspacks, Edelbrock double roller timing chain, Edelbrock valve springs, Flex fan, C4, Lakewood traction bars, 3:1 open rear-9" 3.89:1 posi coming this summer =========================

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02-16-2001, 01:59 PM	#2
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	compression ratio isnt something anyone can tell you. there is a formula for it, with many variables involved. Im sure you could find it on the web. Try corral tech info. i think they have the formula. ------------------ 1993 GT/AOD '93 Mustang GT

02-16-2001, 10:23 PM	#3
pro88 Registered Member Join Date: Dec 2000 Location: roseburg, oregon Posts: 87	I have a '69 Windsor in my '88 and I did a lot of research about these motors. What I found was the 2 bbl motors were 9:5.1 comp. and the 4 bbl motors were 10:7.1. Mine started out as a 4 bbl motor and I had the 1.84 / 1.55 valves in the heads with flat top pistons. That's how I knew it was a 4 bbl motor. My Windsor is now .030 over with forged pistons, ported/polished stock heads, screw in studs w/guideplates and a .536 - .293 solid lifter cam. I'm running a victor intake with a 750 double holley. Runs excellent. 11.40's so far in the quarter with 2500 stall, and 3.73 rear gears.