Quote:
Originally Posted by NeighborsComplaint
Already called it after the first motor broke. It's the rockers.
Interesting tidbit ... assume for the moment the OP was running the Lunati 712 cam in the ill-fated motor. With 1.7 ratio rockers his lifts were .606"/.623" (I/E). If the rockers were 1.8 ratio, .642"/.660" (I/E). If the cam was the 713 , then .634"/.640" (I/E) w. 1.7 rockers and .671".678" (I/E) w. 1.8 rockers.
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Good point, however I believe this time 64speed is using the 041 cam with .470" lift (with 1.5 rockers). With 1.7 rockers lift would be around .533". Many cams have that lift with 1.5 rockers so I think this time he might be OK with those rockers. But I would not go that route. I would investigate the problem Gach mentions in post #1491. I believe Pontiac engineeers knew the limits of their block and didn't exceed the 1.65 ratio rockers. FWIW