Thread: 427 so compression test readings
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Old 12-27-2004, 10:30 PM
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SCOBRAC SCOBRAC is offline
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Location: Northern California, CA
Cobra Make, Engine: -Sold- Contemporary 427S/C # CCX-3152 1966 427 Med Rise Side Oiler, 8v 3.54:1 Salisbury IRS, Koni's.. (Now I'm riding Harleys)
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Well... The good news is they are all the same. The bad news is they are very very low. factory specs are 160 to 200. A good tight FE should run 180-195.

I'd go get a new or different gauge, warm it up, pull the plugs and try it again... Compression tests should always be done hot. but even cold they should be close to 175.

Is it possible the thing was set up for a paxton or a roots blower? I'd pull the heads and deck the block. It will likely be a huge miscalculation on which piston the builder used or the volume of the heads.

Is it new? it is feasable (but unlikely) you will see low compression for 1500 to as much as 3000 miles. But if it isn't a fresh rebuild someone messed up.

FYI Lemans rods are too narrow for a NASCAR crank journals the two are not interchangable
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Last edited by SCOBRAC; 12-27-2004 at 10:57 PM..
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