Big problems need help

1SILLYGT · 07-27-2001, 10:22 PM

I just dropped a rebuilt 302 bottom end in my 90 GT and put a pair of GT-40 heads on it. I have a 160 thermostat in it, but whenever she heats up I lose oil pressure. Can someone please tell me whats wrong.

exgmguy · 07-28-2001, 05:14 PM

This post will get moved to Windsor Power by Kevin.

How much does the pressure drop when it gets warm? It it idles at 50-60 psi cold, then idles at 30-40 hot that is nothing to worry about. If you warm idle oil pressure is around 25 psi or lower on a brand new shortblock, you have problems. Too much bearing clearance.

You do have a mechanical gauge, and are not going off the factory dash unit right?

07-27-2001, 10:22 PM	#1
1SILLYGT Registered Member Join Date: May 1999 Location: sloatsburg NY Posts: 28	Big problems need help I just dropped a rebuilt 302 bottom end in my 90 GT and put a pair of GT-40 heads on it. I have a 160 thermostat in it, but whenever she heats up I lose oil pressure. Can someone please tell me whats wrong.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
what if any problems with your Modular Model Gt/Cobra?	fixer	Modular Madness	18	04-03-2005 09:18 AM
HELP: Problems after Paxton Novi 1000 install	Meatman	Windsor Power	3	10-17-2002 06:03 PM
Sick 88 Gt Computer problems?	ziggy_2k	Windsor Power	5	06-02-2002 10:33 PM
'65 - Pull Away Problems - Action Plan	geordie	Classic Mustangs	0	05-14-2002 01:43 PM
Cooling System problems	1973Mach1	Classic Mustangs	7	06-25-1999 10:33 PM

07-28-2001, 05:14 PM	#2
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	This post will get moved to Windsor Power by Kevin. How much does the pressure drop when it gets warm? It it idles at 50-60 psi cold, then idles at 30-40 hot that is nothing to worry about. If you warm idle oil pressure is around 25 psi or lower on a brand new shortblock, you have problems. Too much bearing clearance. You do have a mechanical gauge, and are not going off the factory dash unit right?