icedenali

I have set of 1.8 rocker arms from PRW. but I tried several time trying to put them in. but everytime I tried engine doesn't start. it just spin out and after couple tries engine does not build compression in the piston. I have LQ4 ported heads with LS6 cams. using comp cam 7.400 harden pushrod.

here's my Q I have seen adjustable push rod. that can measure it.
but my mechanic and other sources telling me it might be too short that I need 7.500.
need some answer to put my rocker arms in it's been giving me nothing but headache

mvvette97

iTrader: (18)

I was always told that with the 1.8 rockers it requires shorter pushrods. If your pushrpds are too long then it will be holding your valves open.

vettenuts

iTrader: (4)

Exactly. I am not familiar with these rockers, but with the Cranes the rocker requires a shorter pushrod for a stock setup, and they are 7.250".

Are these rockers fully adjustable or when you bolt them down do they seat? If fully adjustable, then you also need to check your wipe pattern because the pushrod length will determine the final preload and wipe pattern simultaneously. Can you provide any photo's or something to see what they look like?

GuitsBoy

iTrader: (4)

get the adjustable pushrods, measure it, then add .75 to .100 extra length to th epushrods you order.

icedenali

hm....so i should get adjustable pushrod first, and hm....i was thinking 7.300?
since it's stock7.400.

thehammer69

iTrader: (2)

Stop guessing and get an adjustable pushrod that you can use to measure the exact length you need to order. The Adjustable pushrod is only around $22 from Summit.

Hammer

vettenuts

iTrader: (4)

Unless its adjustable, then he needs to verify the wipe pattern too. I used stud depth to figure out wipe, made the pushrod length easier to figure out.