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302 cylinder compression PSI

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Old 12-21-2009, 11:35 PM   #1
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Default 302 cylinder compression PSI

What is stock cylinder compression for a 302 c.i. ? As long as we're on the subject, how about a 300 c.i. also?
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Old 03-02-2010, 10:34 PM   #2
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1987-1995 302
9.0:1 Compression
4.0 X 3.0 (Bore X Stroke)


1987-1995 300-06
8.8:1 Compression
4.0 X 3.98 (Bore X Stroke)

old subject but i got board and sniffed thru old posts :-D
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Old 03-02-2010, 10:56 PM   #3
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Originally Posted by grilljames View Post
1987-1995 302
9.0:1 Compression
4.0 X 3.0 (Bore X Stroke)


1987-1995 300-06
8.8:1 Compression
4.0 X 3.98 (Bore X Stroke)

old subject but i got board and sniffed thru old posts :-D
Keep sniffin! They're compression ratios, not cylinder compression. Where did you dig up this thread? I don't even remember posting it!

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Old 03-02-2010, 11:02 PM   #4
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ohhhhh i read it backwards..... :-D
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Old 03-02-2010, 11:08 PM   #5
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ohhhhh i read it backwards..... :-D
? c.i. 302 a for compression cylinder stock is What
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Old 03-02-2010, 11:14 PM   #6
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You talking about compression test.
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Old 03-02-2010, 11:15 PM   #7
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is that a trick question? HAHA
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Old 03-02-2010, 11:22 PM   #8
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Originally Posted by ymeski56 View Post
? c.i. 302 a for compression cylinder stock is What

the lowest reading should be with in 75% of the highest reading
Example: If your highest reading is 150 PSI then your lowest reading should be no less the 113 PSI. (113 PSI = 75% of 150PSI ) I found it in the fine print of my chilton... hard for old guys to read i know.
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Old 03-02-2010, 11:42 PM   #9
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Originally Posted by grilljames View Post
the lowest reading should be with in 75% of the highest reading
Example: If your highest reading is 150 PSI then your lowest reading should be no less the 113 PSI. (113 PSI = 75% of 150PSI ) I found it in the fine print of my chilton... hard for old guys to read i know.
I know that drill too. To be more specific, I get 179-182 psi on all cylinders (302 c.i.) I'm wondering if my gauge is wacked, because it seems kinda high. I didn't disconnect the fuel pump, so I'm also wondering if i should consider these dry or wet readings.
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Old 03-02-2010, 11:46 PM   #10
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id try it dry but i doubt that little of fuel would push it up and i was once told 300-6 r high comp. engines i dont have the slightest clue.... i got an idea
EVERYONE POST YOUR COMPRSSION READS ON HERE SO WE ALL HAVE SOMETHING TO GO OFF OF and ur year, mileage, and motor
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