[grandville455]

Originally Posted by slowbird

60lb Melling Select

This is what I'm using.

http://stores.precisionoilpumps.com/...psi-race-pump/

[mgarblik]

I would think .060" restrictions would still provide plenty of oil to the top, either in the lifter bore or pushrod restrictors. But I am not any kind of expert on extended street use of race engines. I can say just at electric drill speed in a priming scenario, you get lots of oil through the rocker arms with a .060" restriction. Good luck with your build.

[slowbird]

I know my bushed Crowers and a .060 restricter didn't get a long.

[BADDTA]

Originally Posted by grandville455

Brian
Do U guys have any restrictor's? What brand of lifters u guys running? What size lifters? Lifter bushings in block also/ U also run a vacuum pump too correct?

No restrictors, Calvin’s “mystery” brand lifters, (which I think I figured out who’s they are), .842 diameter, no bushings in the block and yes we run a 4 vane moroso pump.

Brian

[grandville455]

Originally Posted by BADDTA

No restrictors, Calvin’s “mystery” brand lifters, (which I think I figured out who’s they are), .842 diameter, no bushings in the block and yes we run a 4 vane moroso pump.

Brian

Standard cam journals too? Pm me your number, I don't have it anymore.

[grandville455]

Originally Posted by mgarblik

I would think .060" restrictions would still provide plenty of oil to the top, either in the lifter bore or pushrod restrictors. But I am not any kind of expert on extended street use of race engines. I can say just at electric drill speed in a priming scenario, you get lots of oil through the rocker arms with a .060" restriction. Good luck with your build.

What's the stock feed hole size in a stock block?

[mgarblik]

I think they are .250". Allot probably had to do with not breaking drill bits when you are making hundreds of thousands of blocks and 16 holes per unit. The factory essentially let the lifter provide the restriction, which the lifter manufacturer loves too. That way, their lifters get all the oil they possibly can by the lifter design. This is fine for a stock engine. But in my opinion, in race form, the Pontiac engine is barely adequate. Large mains, lots of bearing speed, small internal passages, non-priority oiling to the mains, they need help. Probably to 500-600 HP, nothing in the oiling system needs to be touched. Some improvements can be made if you are going to make big power.

[beargfr]

I'm Steve's friend who's in the process of putting my stock block 461 back together. I'm using the Crower cutaway HIPPO needle bearing solid rollers with a cam that has .4300 lobe lift. What has me confused/concerned over this whole oiling question is that when the lifters are down on the cam base circle, the oil bands are definitely below the lifter bore feed holes. Seems to me like that's going to greatly restrict if not completely cut off the oil flow to the needle bearings until the lifters get far enough up on the cam lobe to expose the bore feed hole. This is a 99% street build so I really don't want to have any oiling problems. I sure don't understand why these lifters are made like this, with the oil bands so low...

Rob

[73 TRANSAM]

This is where the bushing for the lifter bore shines. They can have a cut in the OD of the sleeves and then have two holes intersecting on the flat on the OD of the bushing.

[Jack Gifford]

Originally Posted by mgarblik

... I think they are .250"...

For whatever little it's worth- they are somewhat under .250", since they can be tapped for restriction by drilled 1/4-28 setscrews. (.213" or so?)

[AG]

I use needle bearing Crower SR HIPPO lifters and restricted pushrods and an 80 PSI pump. The springs still get plenty of oil and the lifters get full flow. With main clearances 0.003"-0.0035"oil pressure is 40 psi hot at idle.

[Vince GTO]

Originally Posted by AG

I use needle bearing Crower SR HIPPO lifters and restricted pushrods and an 80 PSI pump. The springs still get plenty of oil and the lifters get full flow. With main clearances 0.003"-0.0035"oil pressure is 40 psi hot at idle.

What pressure at high RPM?

[AG]

85 psi fully warmed up.

[grandville455]

Here's my thoughts thus far, I'm thinking I will leave the restrictions open, but rotate the cam bearings like mike said to the 5 o'clock position and not line up with oiling hole?
I will also discuss this stuff with my engine guy when he gets the block and lifters in hand also.

[Hooter]

Take a look at the cam bearings from Mark Luhn also.

[grandville455]

Originally Posted by Hooter

Take a look at the cam bearings from Mark Luhn also.

Brad, Aren't these similiar to Marks?

GMP-55T

[Hooter]

Heck, I don't know if same or not. Been running these in my motor since new with good results.

http://www.luhnperformance.com/ponti...shaft_bearings

[grandville455]

Looks like a similiar design just another option for the standard journals instead if not using the 55mm , has the groove all the way around n three holes just like the ones for the bigger journal

[Kelvin Poe]

I ran Calvin Hills bushed solid rollers in my aluminum IA2 with no restrictors and with a vacuum pump in my Grand Prix during drag week 2016, no problems. I'm running a different set up now, though. I've gone to a turbo and a hyd roller cam.