what you think about my compression readings? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

weider1717 · 03-11-2016, 08:51 PM

Bought new plugs figured I would check the compression on my 87 only got half of them and my battery died and didn't charge and it's a new battery…anyway here they are. 87 350 5.7 69K miles.

BTW these were taken by my OTC compression test gauge supposed to be a nice unit so I assume readings are accurate.

cylinder #1- 172.5, 2nd test 174

cylinder #3- 175, 2nd test 175

cylinder #5- 175, 2nd test 179

cylinder #7- 180, 2nd test 180

Plug #7 the back one was a bit oily black wet other 3 were dry and looks pretty good. First test I have done been wanting to try out my test set any input on these readings? good? bad? so so? Also what should they be?

03-11-2016, 08:51 PM	#1
weider1717 Registered User Join Date: Apr 2011 Location: greenville sc Posts: 558	what you think about my compression readings? Bought new plugs figured I would check the compression on my 87 only got half of them and my battery died and didn't charge and it's a new battery…anyway here they are. 87 350 5.7 69K miles. BTW these were taken by my OTC compression test gauge supposed to be a nice unit so I assume readings are accurate. cylinder #1- 172.5, 2nd test 174 cylinder #3- 175, 2nd test 175 cylinder #5- 175, 2nd test 179 cylinder #7- 180, 2nd test 180 Plug #7 the back one was a bit oily black wet other 3 were dry and looks pretty good. First test I have done been wanting to try out my test set any input on these readings? good? bad? so so? Also what should they be?



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