You gotta see this ......
I was also under the impression that the stock Valvetrain could be used with the Edelbrock RPM heads. I just bought a set and I will be running the xe268H cam.
The stock valvetrain will bolt on and work but it is just a question of the rocker push-pocket strength.
The XE cams have fast ramps so that is going to put more force on the rocker arms and other valve train parts, when you increase the RPM's. But the maximum lift of that cam is only .47-.48" so that keeps the full open valve spring force lower; it will be around 275 lbs full open, which is moderately strong, but not super high.
You might be OK. You just have to try it.
For those running the stock valvetrain parts on these heads, I would like to hear:
- What cam is being used and the lift?
- If the Edelbrock supplied valve springs are being used?
- What peak RPM's do you run?
- Are the stock rockers just off 'some engine' or did you get the heavier ones like from Mancini?