GMPP 1.6 Roller Rockers....

How much of a 'seat of the pants' increase, if any, do a set of 1.6 roller rockers add? Anyone? Found a screamin' deal on a new set and wanna pull the trigeer but haven't yet.

I've been told you'll feel it, but you wont' REALLY feel it until you upgrade the rear end to something like 3.73's.

See my 'wanted' add......hehehe!

It's not a huge SOTP increase. However, with new upgraded valvesprings you will definitely notice a huge improvement in the upper RPM.

You talkn' LT4 springs? The generic Z28 springs? Any reccomendations?

the LT4 springs are way too weak. Go with beehives (26915), patriot gold, or crane.

Crane:
ALUMINIUM CYLINDER HEADS:
Use 10308-1 Spring and Retainer Kit
Contains: Valve Springs 99893-16
Retainers 99951-16
Valve Locks 99097-1
Spring Shims 99050-1
IRON CYLINDER HEADS:
Use 10309-1 Spring and Retainer Kit
Contains: Valve Springs 99845-16
Retainers 99914-16

Thanks!

As you install 1.6 rr on your iron heads be sure to check that you push rods clear, mine did not. Therefore I have 1.5 rr installed until I can switch heads.

Tim was your pushrod slot too narrow?
Jim

yes and I did not notice when I first installed. It was ticking a bit so I removed the valve covers and saw the wear on the pushrods. Then when I watched the re-install I saw the pushrods bend as I tightened the rr. Pulled them all off and went to a 1.5.

I have used Comp Cams Pro Magnums and Ultra Pro Mags but I have a set of the GM I am going to try if I ever get to do my heads!!

Tim, was this with a stock camshaft ? What springs and at what height had you installed them ?

jasonlachapelle wrote:

Tim, was this with a stock camshaft ? What springs and at what height had you installed them ?

what he said!! pushrods don't bend enough that it can be seen with the naked eye,. and if they do,.they don't have a memory so they stay bent,.


Nick

I have never heard of someone having problems with 1.6 on stock cam.

Sorry I just noticed these responses.

I put a set of CM618 springs I bought used from RJI on the other forum. They were drop on springs so I did not measure height. It was a totally stock motor. When I first installed the 1.6rr I did not even look, but noticed they were noisier than usual. I removed the passenger side cover and began to play, I saw that as I tightened them the push rod bent to go into place in the rocker. There was some wear on the hardened push rods as well.