oil pressure problem

79transam · 03-04-2012, 08:45 PM

I have a 434 sbc. with a motown block. i ran this car last year and when i let off at the end of the track my oil pressure would drop to 10lbs. so i put a new pump in this year with a copper gasket and it wouldnt hardly carry any pressure at all when it warmed up. so i put another new pump in and removed the gasket. same problem still. i was using a bolt on pump screen, so i removed this pump and brazed the screen. i dont think its sealed 100% but its prob pretty close. so today i take it out and it will carry 60lbs of pressure for a good while, if i get on it or cont. quick reving it it will drop down to almost 0 then climb back up to 20lbs and may hit 40 but if i rev on it it drops down as soon as i let off the throttle. im stumped. i run 20/w50 lucas oil with a wix racing filter. and yes ive tried a different gauge. any help will be greatly appreciated

03-04-2012, 08:45 PM	#1
79transam Junior Member Join Date: Aug 2011 Posts: 22 Likes: 0 Liked 0 Times in 0 Posts	oil pressure problem I have a 434 sbc. with a motown block. i ran this car last year and when i let off at the end of the track my oil pressure would drop to 10lbs. so i put a new pump in this year with a copper gasket and it wouldnt hardly carry any pressure at all when it warmed up. so i put another new pump in and removed the gasket. same problem still. i was using a bolt on pump screen, so i removed this pump and brazed the screen. i dont think its sealed 100% but its prob pretty close. so today i take it out and it will carry 60lbs of pressure for a good while, if i get on it or cont. quick reving it it will drop down to almost 0 then climb back up to 20lbs and may hit 40 but if i rev on it it drops down as soon as i let off the throttle. im stumped. i run 20/w50 lucas oil with a wix racing filter. and yes ive tried a different gauge. any help will be greatly appreciated