CoBIZZLE

I got a 98 z-28 and bent half the pushrods on a missed shift. I have tried to order new ones twice and have been given the wrong length both times. I been told it is 7.4". Does anyone know???

mrr23

iTrader: (3)

7.400 is correct.

bigdsz

iTrader: (1)

Try 7.38". That's why you frequently have to buy aftermarket 7.40" when you install an after market cam, due to the smaller base circle.

mrr23

iTrader: (3)

my mistake. they are 7.380.

PREDATOR-Z

7.40 will work on stock motors. Your preload will increase by .02 but that is still well within the acceptable range of the stock lifters.

98A4LS1

iTrader: (1)

Seems like there was a thread about two months ago, stock PR's removed from 98 Z and were measured at 7.40.

redtail2426

iTrader: (10)

the rumor of 7.38 is not correct i had a set micd by a machinist on 2 machines and they average 7.395.The longest was 7.398 and the shortest was 7.393.i dont know where this 7.38 came from but its not right

PREDATOR-Z

Wel as you said yourself, you had variations in 1 set.
I measured one from my 01 and it was 3.84
So we can conclude that they range from 3.8x> 3.9x (must depend on where they were made or since they are not hardened, that they stretch.)

redtail2426

iTrader: (10)

yeah they must have been made in a different plant or something.you can see the variations in the tips of the pushrods that makes one longer then the other.the hole n some of them is off center a little bit making it a hair longer.I bet when they are installed the height difference has much less variation.you will see what i am talking about if you really look close at the tips.

davered00ss

iTrader: (4)

Get a set of hardened 7.40's.

Z06er

7.400

mrr23

iTrader: (3)

well then, i guess i'll retract this statement until further verify-able proof exists.

camaroguy26

iTrader: (21)

you're best off getting a tool and measure the actual length you need, just rent one from autozone or something, you gotta tear the car apart anyways right? The stock pushrods are weak and were all machined to one size so they could have been shorter or longer than being perfect.