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Old 01-22-2005, 20:58   #1 (permalink)
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Compression for 351 Clevo

What is a good compression reading for a 351 clevo.
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Old 01-22-2005, 21:19   #2 (permalink)
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Re: Compression for 351 Clevo

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What is a good compression reading for a 351 clevo.
With a stock camshaft -> 145-155psi.

[edit]My book says 100-650kpa but as long as they are even it's okay.

If you start to modify things it changes everything. Modifying things inc just a camshaft change.

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Old 01-22-2005, 21:23   #3 (permalink)
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Re: Compression for 351 Clevo

No it has big camshaft,tfc manifold,4v heads
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Old 01-22-2005, 21:28   #4 (permalink)
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Re: Compression for 351 Clevo

Anywhere between 155->215psi is where you'd be at roughly. I've got a static of 11.2:1 and have 185psi cranking with a 248@50 cam.

My mate has 10.5:1 static and 215psi cranking with 238@50 cam.

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Old 01-22-2005, 21:45   #5 (permalink)
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Re: Compression for 351 Clevo

215 wow. Isnt that a bit high.
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Old 01-22-2005, 21:47   #6 (permalink)
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Re: Compression for 351 Clevo

Doesn't seem to be.

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Old 01-22-2005, 22:00   #7 (permalink)
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Re: Compression for 351 Clevo

Iv'e got 130 pounds with 10.7:1 and 246/256 50th duration.(good nos motor. lol)
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Old 01-23-2005, 02:06   #8 (permalink)
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Re: Compression for 351 Clevo

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Iv'e got 130 pounds with 10.7:1 and 246/256 50th duration.(good nos motor. lol)
Sounds like it would be good with an 6/71 blower out the bonnet Dion.............i would do it if i had the means.
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Old 01-24-2005, 06:08   #9 (permalink)
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Re: Compression for 351 Clevo

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Sounds like it would be good with an 6/71 blower out the bonnet Dion.............i would do it if i had the means.
Hey, i finally got around to picking up my mates Snap on Tools gauge to recheck. I did a quick test on one cylinder only(#7) and after about 6 compression strokes it read 190psi.
I did the 6 strokes as all the plugs were in, and it wasn't winding as fast as that last test i did with em out. All should be ok.
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Old 01-24-2005, 06:21   #10 (permalink)
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Re: Compression for 351 Clevo

Your rings probably hadn't seated correctly? I had similar happen to mine. Your not using chromoly rings are you? Took awhile for mine to bed in.

190psi's where you want to be at. I still reckon that dyno's lying but ah well. s**t happens. Your video's shows how the engine is stout. It never sounded like an unhealthy clevo anyway.

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