86HOGT

Yeah before it sounded like you said you cranked the adjuster all the way down which isn't how you set it.

Are you running Comp rockers? Cause in AFRs instructions it says that you have to get longer pushrods to run with a certain roller comp rocker.

Also, did you take each stud out, seal, and torque it to 60lb ft when you first got the heads? Because you need to according to AFR.

silver91gt

my crane lifters say 1/4-1/2 turn past 0 lash will give me the correct lifter preload
I think its 0.020-0.060

maverick771

i dont belive a broke rocker will make your oil pressure drop

Mustangkiler

was the car wanting to die out or running bad when the pressure went to zero or is it still running fine and reading 0?

knucklefux

what oil pan do you have? how about the pickup tube? at higher rpm, the oil pump is pulling huge quantities of oil out of the pan, and if the pickup tube is too far off the bottom of the pan, you will lose oil pressure due to lack of oil above the pickup tube. you may have some restriction in the oil return system that is causing the oil not to return to the pan properly as well.

just my 2cents, it can only be caused by certan things. you must approach these things logically.

Grimace5.0

By the sounds of things there are two problems here. One has no effect on the other....

Rocker studs break because something is in a bind. What cam is in it? What push rods? What valve springs? What in the installed height? What rockers? Coil bind?

Oil pressure deal..
Pump could be leaking between the block and the pump, or the pick up tube and the pump. Also could be that the pick up is too close to the bottom of the pan.

Preload on a HYD lifter cam is 1/4 turn past zero lash, 1/2 turn max.

silver91gt

I did torque the AFR studs before installing the rockers.
my AFR instructions said nothing about needing longer pushrods,
I used stock length hardened pushrods. 6.25" long


springs are stock AFR springs
I set the preload at 1/2 turn.

there is no coil bind on the springs, I am running the motorsport B-303 cam with comp cams 1.7 rockers. the lift is only 0.510"


I am running a stock oil pump, pickup and pan, if the pickup was too close to the pan, would the oil pressure have problems from day 1 of driving it, or can it be a progressive problem?

I am guessing the oil pressure problem was due to the stud splitting leaving some clearance between the pushrod and lifter, making the oil spray out there losing oil pressure.
then it completely broke.
I may have floated the valves too, I have been driving it to 6200 RPMs at the track.


anyways, I noticed that my rocker arm locks were only screwed on mabye 5/16", so I got some ARP studs that are 1/4" longer.

I put the new studs in today, and it runs fine (for now)
I have to do a compression test tomorrow to see if I bent a valve.

I did notice that I have less vacuum now than before.
before I had 12 vac with 1/2" preload
and now I only have 10 vac with 1/4" preload

thanks for all the replies.

90Mustangfan

what are your mods to give you 305hp? and is that 305hp to the wheels?

silver91gt

afr185 heads, b-303 cam, rpm2 intake, full msd, 70 TB, 73 MAF, fenderwell CAI,1.7RR's
yes it is RWHP.

sgt_pepper17

I don't see how that would cause an oil pressure drop. Oil pressure drop almost always means bottom end, cam bearings, oil pump assembly, or oil pan. I'ld stick to those if I were you. The gauge is gonna read from those, because once it hits the lifters, it doesn't matter where it goes from there. It could blow out the side of the block as far as the pressure gauge cares...