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Wally · 10-04-2002, 12:06 PM

Well let me start off by saying HI to everyone. My friend picked up an 87 5.0 HO to put in a 66 Bronco that he’s doing a frame up restoration on. We thought we would do a compression test to see what shape the motor was in before we started. The Mustang that it came out of was rolled and was upside down for a while so one cylinder shot oil a crossed the garage. The compression test went from 140 psi to 190 psi. on one side and 180 psi to 195 psi on the other. I haven’t seen a stock motor have that kind of compression of I figured I would ask the 5.0 experts here on the board.

What should the stock motor have for compression?

I’m thinking the motor has a lot of carbon built up on the pistons that it causing the high compression.

Thanks for your input.

10-04-2002, 12:06 PM	#1
Wally Registered Member Join Date: Oct 2002 Location: Santee CA Posts: 1	Stock compression for an 87 5.0 HO??? Well let me start off by saying HI to everyone. My friend picked up an 87 5.0 HO to put in a 66 Bronco that he’s doing a frame up restoration on. We thought we would do a compression test to see what shape the motor was in before we started. The Mustang that it came out of was rolled and was upside down for a while so one cylinder shot oil a crossed the garage. The compression test went from 140 psi to 190 psi. on one side and 180 psi to 195 psi on the other. I haven’t seen a stock motor have that kind of compression of I figured I would ask the 5.0 experts here on the board. What should the stock motor have for compression? I’m thinking the motor has a lot of carbon built up on the pistons that it causing the high compression. Thanks for your input.