Push rods length for GT9 blower cam?

[T-r3x]

Hey guys!

How's everyone?
I'm going to install GT9 blower cam
What's the right length for the push rods with this cam?
According to COMP's customer service, I need a longer push rods than the stock 7.400" in my LS3

Thank you

[kevint]

Only way to tell for sure is to buy a pushrod length checker.

[T-r3x]

Originally Posted by kevint

Only way to tell for sure is to buy a pushrod length checker.

Will my geometry be different than the others? even with the same cam?

[strych9]

Originally Posted by T-r3x

Will my geometry be different than the others? even with the same cam?

Unless you've done something with the heads, the geometry should be unchanged. You still need to use a length-checker to be sure.
EDIT: I re-read your post. If Comp is telling you that different length pushrods are needed, then the base circle on the cam must be different. You would be wise to listen to them.

[T-r3x]

Originally Posted by strych9

Unless you've done something with the heads, the geometry should be unchanged. You still need to use a length-checker to be sure.
EDIT: I re-read your post. If Comp is telling you that different length pushrods are needed, then the base circle on the cam must be different. You would be wise to listen to them.

I must buy all the parts together, so I can't measure first :(

[DieselMD @ Futral]

If you knew the base circle of the cam, then we could tell you what you'll need.

[T-r3x]

Originally Posted by DieselMD @ Futral

If you knew the base circle of the cam, then we could tell you what you'll need.

215/247 duration @ .050 lift - .629/.656 lift with 1.7 rocker 121 CL

That's all I know

[BFASTNOTLAST]

Originally Posted by T-r3x

215/247 duration @ .050 lift - .629/.656 lift with 1.7 rocker 121 CL

That's all I know

What Diesel is trying to tell you is you have to measure the cam with dial calipers or a micrometer. You want to measure to the smallest number you come up with while rotating the cam to find the smallest point.(don't bother with the nose of the cam) For instance my stock cam was 1.503 and my replacement cam was 1 .430. It has a smaller base circle. This is what you need to figure out. This should get you in the ball park, but you need to properly measure with a pushrod length checker at 0 lash. Also verify by the number of turns on the rocker bolt from 0 lash to torqued at 22 ftlbs. should be in the 1 1/2 turn range. Search around there are plenty of threads on this. Take your time and measure twice.

[T-r3x]

Originally Posted by BFASTNOTLAST

What Diesel is trying to tell you is you have to measure the cam with dial calipers or a micrometer. You want to measure to the smallest number you come up with while rotating the cam to find the smallest point.(don't bother with the nose of the cam) For instance my stock cam was 1.503 and my replacement cam was 1 .430. It has a smaller base circle. This is what you need to figure out. This should get you in the ball park, but you need to properly measure with a pushrod length checker at 0 lash. Also verify by the number of turns on the rocker bolt from 0 lash to torqued at 22 ftlbs. should be in the 1 1/2 turn range. Search around there are plenty of threads on this. Take your time and measure twice.

I will!
Thanks