Compression for 5.0 HO

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09-15-2009, 10:04 PM

92hatchLX

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Compression for 5.0 HO

What are the stock compression numbers for a stock headed, stock sized gasket, stock piston and stroke 5.0 HO? Did a compression test tonight and I'm trying to see how my numbers compare to what they're supposed to be.

09-15-2009, 10:43 PM

92hatchLX

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Looks like my results are goofed anyways. I only let the motor warm up to about 160 degrees and I didn't have the throttle body wide open when I was cranking the motor. Any answers would still be appreciated.

09-15-2009, 11:08 PM

mjr46

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9 to 1 and close to 150 is good some may vary 130-140 depending on altitude

09-16-2009, 01:06 AM

5.0stang123

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Ya i got 135 ish to 140 ish, almost 200 000km. Runs good even though i beat on it.

09-16-2009, 07:41 AM

92hatchLX

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Quote:

Originally Posted by mjr46

9 to 1 and close to 150 is good some may vary 130-140 depending on altitude

I thought these motors were 8.5:1? Eh either way doesn't matter. I'm hoping for 150+ compression numbers after I re-do this when I get home. Depending on the compression numbers, I'll be order my Quarterhorse this evening or more 408w parts.