Thread: 427 Top Oiler

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Originally Posted by Lord Antagonism

So, am I going to start an argument if I ask what people think is the best size restrictor to use in the oil ports in the heads under the rocker shafts for a mostly street driven engine? It seems like every person I ask gives me a different answer...

A: You don't need them if you have good shafts and rockers that don't have a sloppy fit.

B: Always put in .090 restrictors regardless of the intended use.

C: .060 restrictors should be fine for street use and helps force more of the oil where it needs to go.

I've had people suggest to me to use Holley jets, cut up sections of 302 pushrods, just make my own out of steel rod, etc.

this mod is intended to keep the pressure on the bearings and not bleed of to the rockers. Because the stock opening at the top is quite large, you could experience oilstarvation at the narrower oilling openings at the crank and cam bearings, but only at high rpm's (5000++)

in many cases this mod is done while at the same time swapping the stock oilpump for a HV Melling type...

if you intend to drive it sain and at regular low rpm's, you don't need either mod, but i would recommend the swap of the stock oilpump driveshaft wich is prone to breaking in old/stock FE's.

If you do like to put the pedal to the metal at some time and run it in the 5000-6000 rpm-range, i'd make the mod on both the pump and the topside restrictions...(I myself have a restriction wich leaves a 3mm hole, but a 4 or 5 mm hole will do just fine also!)

Tom

ow...I threaded the original size opening and put in a bolt wich i bored out (bore it while the head is still on, that way you can clamp it easely, then cut it's head of)