WhiteDiamond

For the few in here that have done the PRC LS7 heads on their LS7, can you comment on what pushrod length you ended up with? Stock is 7.8", I believe, and I have heard 7.750 from a few for the PRCs.

Michael_D

I would advise against asking others what they use and check it youself. Then order the correct length to get your desired pre-load.

LS9Drew

Using the stock cam I used the stockers. But I would wait and measure to make sure what exactly u need

Unreal

Measure.

I'm running 7.8125" on stock unmilled PRC 285ccs with a comp cam.

If they are milled you will need shorter. If they are unmilled it will probably be close or a bit longer than stock.

WhiteDiamond

I plan to measure(or may have them installed at a shop and they will), but I was just trying to get a feel for the reality of having to wait for custom length pushrods(longer install time) versus being able to bolt on and go. Looks like I need to figure a few extra days to get the right pushrods.

Undy

I bought the Comp Cams pushrod length checker and measured the required length for my 0.030" milled PRC 265s. I came up with a 7.75" long pushrod requirement. This length provided me with the Katech specified optimum lifter preload, 0.070". The stock length pushrod almost completely compressed the lifter (waaaaay too much preload).

Ben01C5

Undy, What cam are you running?

08VRZ06

When I had WCCH do my heads and milled them .030 I used the comp cams push rod checking tool and with the CHE rockers and the cam lobes set to base circle I got .070 - .080 with the stock push rods....

Mark

Undy

Katech torquer 110

LoneStarFRC

Mine shipped with 7.75"

briancb1

Smith Bro's Pushrods offers a next day turnaround on custom length pushrods, as long as you order by 10am PST.

I needed a 7.760" 3/8" .120 3 piece pushrod to get the .060" preload I was aiming for... called at 9 am, got them overnighted and the car was on the dyno the next morning.

LoneStarFRC

That's some fast service right there.

briancb1

OP: If you need 7.800" pushrods, PM me as I have a set of 3/8" .120" wall Manton's I'm selling.

WhiteDiamond

I was thinking about having mine shipped with that length as well, but I think I am going to measure and just order once.



PS: Your Avatar scars me.........

2k Cobra

LoneStarFRC

Smart move. That's what I would do too.



And me as well.