I don't want to go down to a smaller cam, this is the reason that i am sticking with this 041 cam. More duration and higher lift works well with my up jetted tripower carbs.
This YK code 1967 428HO is one of 1,024 made in 1967 with special equipment. Is it special in that it uses the 524886, cam or is it because of the Y-branch manifolds? I have the partial vin on the block number but have yet to learn from PS what vehicle it was in. All I know is a moonshiner in the Carolinas used it and it was pulled out of a truck. The man who sold me this 1979 TA has passed away, and that is his story.
This motor has d-port heads and 10.75 compression. The 1966 tripower intake and carbs belong to 389 or 421 motor. My engine YK code is automatic and 4 barrel carb, so how did this motor get the tri power set up? is that what makes it special equipment? It was produced early in 1967 and Pontiac had stopped installing tripower in 1966, could my motor be one that was on the shelf prior to the gm tripower ban? The 524886 cam is #6 1956-62 tri power cam, 283 112 .407 60 293 116 .407, it’s between the 067 and 068 cams but i found it is the only cam designated for tripower out of the entire list. That is why in my own personal trial that it works perfectly in sync with the kick down, torque converter and tri power secondaries. At the time i had one inch phenolics under each carb.