Speedmaster heads

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Whosprim

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May 15, 2022
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Texas
Hello everyone. New here. I'm rebuilding a gen 6 7.4 454 for a customer. I'm more a LS builder but doing this for a friend. Got the short block done with a new crank, resized rods, new bearings and piston rings. We bought a set of Speedmaster heads PN PCE281.2033. Also going to run a mild CC Thumper cam. 283th. Just realized the stock rocker blot is smaller thread than the ones on the new heads. I'm thinking the new ones are 7/16. Haven't really tried to figure that out just yet. Either way I'm sure I will have to use screw in studs and roller rockers the measure for correct pushrod length. Just wanted to see if anyone is running these heads. Further in the build we plan to switch to some kind of custom intake setup and a 411 PCM.
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