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I have a 69 350/350 with 11:1 compression ratio. What should the PSI on a compression test read?
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Send PMHot Springs, AR - USA
Joined: 4/24/2004
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Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
150 PSI with no more than 20PSI variance
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Ideally, not more than 10% variation between cylinders. If you are up to 20%, the car will run okay, but not quite right. You may not notice.
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Lifetime Member
Send PMHot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
| kstyer said: Ideally, not more than 10% variation between cylinders. If you are up to 20%, the car will run okay, but not quite right. You may not notice. |
which is pretty consistent with the maximum 20 PSI allowable variance which equals 13%
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in Forum: C3 Engines, Driveline and Handling
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