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427 so compression test readings 427 so compression test readings
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Old 12-27-2004, 09:43 PM
HSSS427's Avatar
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Join Date: Jul 2004
Location: Alpharetta, GA
Cobra Make, Engine: ERA #414 427 s/o w. Shelby Aluminum heads, Edelbrock Performer RPM Intake, Mighty Demon 750, Tremec TKO 600
Posts: 714
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Question 427 so compression test readings
Did a compression test yesterday on my 427 so and all the cylinders came out with readings of about 120 PSI. How do I tell if this is good, bad or indifferent? What type of readings should I be expecting? Bought the car from someone else and they indicated it had 9.5:1 compression. It has an Isky cam (250 duration, valve lift of .525), Shelby aluminum heads, TRW 10:1 pistons and Lemans rods and NASCAR crank. At least the readings are consistent, but am wondering what type of pressure I should expect.

Also, is there any easy way to verify the 9.5:1 compression ratio?
Thanks!
Scott
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