Quote

Lawrence, to quote the thread -

"I just give the facts and try to avoid the big debate.

Greg Gach took a Clevo and put 5 oil pressure gauges on it. One near oil pump above filter, one in rear top of block and the other 3 were between the lifter bores drilled into the oil galley.

He ran the engine hard and watched the center oil pressure gauges drop compared to the end ones. He then added an external oil line and ran it hard again. He saw the oil pressure equalize on all 5 gauges.

He now runs an external oil line on EVERY Clevo he touches wether it be street or strip."

And another -
"I talked to Greg, the guy that hooked up 5 oil pressure gauges.
Yes he had them all plumbed seperately inside the car. Yes he could see as well as a passenger just what each gauge was reading at various rpm's.
He did this because he was always loosing no.3 ano.7 clyinders when he revved OVER 8000rpm. I asked exactly where did you hook the gauges. He showed me a bare block and pointed it out. Very simple. He put 3 gauges on the right side (passengers side) lifter oil gallies, one in the center of the left side galley and one in the normal location on the top of the block.
I'll explain more precisely. If you look at the block where the lifters bores are, you can see a space between each set of lifter bores. He drilled and tapped each space on the right side and the center space on the left side. The gauges were reading the pressure present at the lifter galley oil feed in the block.
At high rpm while drag racing the center two gauges would drop oil pressure. The higher he revved past 8000 the more pressure would fall. The other 3 gauges were OK, just the center two which is the exact center of both left and right lifter galleries.
He then plumbed the external line. He drilled and tapped the "normal" oil pressure hole out to 3/8" pipe size. He ran a steel 3/8" brake line from the block fitting near the oil filter to the enlarged hole in the top of the block at the rear of the manifold.
He went drag racing and ALL GAUGES WERE EQUALIZED ! Including the center two. He doesn't loose 3 and 7 any more. "