5.7L high oil pressure

Asked by Apr 18, 2016 at 12:31 PM about the 1996 Chevrolet C/K 1500 Silverado Extended Cab Stepside RWD

Question type: Maintenance & Repair

I have a 1996 Chevy K1500 4x4 pick-up with a 5.7L   
I purchased a GM crate engine from Jegs and did
the swap myself. The engine runs great except for
the fact that it is running 60-80 psi oil pressure. The
high oil pressure is causing oil to travel up the
distributor chamber and is being pushed out the
distributor gasket. I've changed the oil filter and
removed and inspected the oil filter housing area.
I've also used low compressed air to blow out the
lines going to the oil cooler. (The radiator is also
new). I've been in touch with Jeg's tech support
and due to previous lawsuits they are no longer
authorized to give answers to problems. They gave
me a case # and told me to get my truck to my local
dealer. I am reluctant to do that because I have read
in many cases the GM dealers do not want to work
on warranty items that they themselves did not
install. Have you ever uncounted this problem or
have any idea what may be causing the excessive
oil pressure. Thanks for your time.

4 Answers


is the block/dist. surface true...is there any oil getting into the inside under the cap.... the pressure you have is good... keep us posted

1 people found this helpful.

What about the oil filter housing adapter? Is it used? There is a pressure release valve in there that may be plugged up. Also having the right gasket for the housing, on my engine I had to cut it out to open up the cavity. As Kelly stated 60 to 80 lbs. oil pressure is good. Sounds like there is a high volume oil pump installed. The say the motor should be broke in with an original oil pump first, then change out to the high volume oil pump. Also check the mating surfaces of the distributor and intake. Make sure the gasket is good by pulling out the distributor.


Im also having a problem with high oil pressure, just droped a new jasper 350 long block in a 1998 gmc start ups great but the oil pressure reads between 70-80. hooked up a pressure guage thinking the sensor was off but the guage also reads 70-80

1 people found this helpful.

Bellini, My Z71 is the same way. I had a Jasper rebuilt motor put in less than a year ago. It runs great. I guess everything is so tight it holds the pressure in. I haven't had any problems about oil backing up on me.

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