Where should my compression be at ?

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04-09-2015, 07:35 PM

1973 STEP A SIDE

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Where should my compression be at ?

How much compression should my 5.3 be at ? This is what I have .

1 150 psi
3 150 psi
5 150 psi
7 150 psi
2 147.5 psi
4 145 psi
6 147.5 psi
8 147.5 psi

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04-10-2015, 04:41 AM

Doug G

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Not knowing combo, cam overlap, and such...guessing stock comp. with a slightly larger cam ?
I'm sure there is some formula out there ???

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04-10-2015, 07:38 AM

speedtigger

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Consistency is generally what you look for when the engine specs are not known and your numbers are all very consistent.

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04-10-2015, 06:34 PM

dogsballs

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As above, same or similar across cylinders

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04-12-2015, 05:37 PM

1973 STEP A SIDE

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As always Thanks !!!

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04-15-2015, 01:08 PM

RabidStreetRacer

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http://www.rbracing-rsr.com/compstaticcalc.html
This site will get you your static compression ratio.

You need to know your Cams ABDC number to calculate your dynamic compression ratio