Thread: Just bought a new engine the other day.

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the older 454 were 330 hp and had small o port so it very well could be O ports need the numbers off them had may not have rocker studs could just used the bolt stands and not ajustable that needs to be rework by using the kit they sell or drill and tap them to the old 7/16 top and bottom rocker stud . arp sells a studs that are 3/8 bottom and 7/16 tops i like just to drill the head out for 7/16 bottoms studs and you will have to go roller rockers or the older mark 4 rockers the