justhereforinfo

These roller rockers are coming off stock mustang heads and going onto my GT40p's (hopefully). Are they interchangeable?








I know they're both 1.6's but Im just double checking. I've found an instructional diagram on how to install them. Does this sound right.....?


Manually rotate engine until I find the tdc of the compression stroke for each cylinder(when both pushrods are at their lowest point and even). Remove and install new rockers and hardware. Tighten to accommodate for specific preload. Repeat for each cylinder.

I'll be using a TFS stage 1 cam(.510 lift), TFS spring upgrade (.542 max lift), these 1.6 rr's, and Gt40p heads. Sound good?

justhereforinfo

Actually, I should mention, I'll be installing the stock GT40p's rocker arms onto the stock E7 heads using the directions above. Once I remove the Roller rockers, I will be putting them onto the GT40p's and eventually into my car. Should I assemble the rr's onto the gt40p's now, or will I need to follow the same directions when I install the heads? Might as well leave them off, right?

Note: I've never installed rocker arms or heads.

projectresto83

The rockers in the lower pic are not 1.6 rockers. They are 1.5's, note the 5 stamped on them. At least this is what I am told. I had a set on my car and swaped them out for the stock rockers off a H.O. motor and did feel a small difference.

justhereforinfo

The rockers in the lower pic are stock GT40p rockers. I thought they had 1.6's in them. Well, even if they are 1.5's, are they interchangeable?

mjr46

if using stock stamp steel pedastal mount rockers just bolt the suckers down!! no need to be technical for stock ones, trust me!!

projectresto83

Exactly ^, and yes they should be interchangable.

Joel5.0

Nope.... stock stamped rockers are 1.6 ratio.

justhereforinfo

Really!? Wait, let me be clear.... right now Im uninstalling the blue roller rockers from a set of stock E7's that are installed on my friends car. Once they are off, I will replace them with stock GT40p rockers. Do i need to manually rotate the engine to relieve pressure from the pushrods/rocker/springs?

Second question. When I install the GT40p's, can I have the roller rockers attached to the head? Or should I rotate the engine manually and install each cylinders rockers when there is no pressure on them after the head is on?

projectresto83

Thats what I was getting at. I changed the ones that were on my 306 with stock EFI ones. The H.O.'s had what looked like 6's stamped on them. Either way roller rockers are the way to go regardless. I need to get myself a set.