1nasty86

iTrader: (63)

looking at my pushrod checker it seems to like the 7.300 length. does this seem right for a 5.3 with 243 heads shaved .030 with a .040 head gasket???

Sales2@Texas-speed

iTrader: (5)

How did you measure?? Are you using Comp's 7702-1 pushrod length tool? How many turns did it take to get from your zero lash length back to the fully screwed-in length? 7.300" isn't out of the realm of possibility, but it's not terribly common either.

1nasty86

iTrader: (63)

yes im using comp. length checker. the 7.400 is way too long. turning it a full turn down gives me 7.350 correct? as the rocker arm is torqued it compresses the spring a little bit. so i tried another 1/4 turn which gives the 7.325. still tries to compress the spring. another 1/4 turn gives should give 7.300. it just does touch the rocker arm. does this sound correct?

Sales2@Texas-speed

iTrader: (5)

So you're using a known 7.400" pushrod and using the .012" per 1/4 turn on the rocker trick? Or are you putting the lifter on the base circle and running the checker tool out to zero lash with the rocker arm torqued to 22ftlbs, and then counting how many turns on the tool it takes to get back to the short length of 6.800"??

1nasty86

iTrader: (63)

im turning the checker to the specified length then torqueing the rocker arm down.

vettenuts

iTrader: (4)

Based on what I think you are describing, the 7.300 is a little loose and the 7.325 is more then snug, you need to add in the preload of the lifter so the final number is going to end up around 7.375"-7.400".

1nasty86

iTrader: (63)

i was told by john at texas speed that he thought id need the 3.750 pushrods... becuase the 7.400 are WAY too long

1nasty86

iTrader: (63)

twisting the length checker to 0 lash is 9 1/2 turns... that equals 7.275....

1nasty86

iTrader: (63)

bump for some info.

Sales2@Texas-speed

iTrader: (5)

7.350" will set you up with right at .075" preload. That should work fine for the GM lifters, if that's what you're running.