90mustang5.8

what the compression on a stock 351 windsor?

the new nos/man

about 125 / 145 psi

90mustang5.8

is that close to like 8:5:1 or no?

atomsk680

really depends on what year and what car thew block came from, remember, the 351 was made from the 60's to the 90's, thats 30 years

90mustang5.8

72

H Dean

i'd still think it would depend on what the engine came out of. some of the HO 351's had higher compression. Some in the trucks were lower.

I got mine from a 1986 ford f150. it came with a holley and had an air cleaner that said 351 HO. I'm assuming that it had higher compression and would guess it was still below 10:1.

I've got 10.25:1 now.

what are you doing with the motor? My guy said that i can not 'blow or nos' my motor as it stands due to head gaskets and compression being bumped over 12/13 to 1 will be a problem.