LSXHawk

iTrader: (27)

Is anyone running these? Would like to know the power ur making and what bore size are u running

Patron

Would be around the same as any typical aftermarket Ls3 or Factory ported heads depending on who's Cnc program. They all are pretty close in terms of power.

KW Baraka

iTrader: (7)

Just know that if you go with these, you will either have to run OEM rockers or TSP's rockers,.....or you can take a chance to have someone further cut them to make shaft rockers fit.....and good luck with that.

KW

LS1MCSS

iTrader: (18)

The PRC 260 heads don't have the valves in the stock location. Because of this, they have the rocker stands machined into the head. You can use stock rockers without the factory rocker stands. Any direct replacement roller rocker will also work, if the intake and exhaust rockers are not connected with a shaft. I have a set of these that I plan to modify so I can run Harland Sharp adjustable rockers and an LLSR cam from Cammotion.

A.R. Shale Targa

iTrader: (2)

Buddy of mine runs the PRC 255 on an 11.25:1 417" In a Grand Sport Vette with facrory induction (intake/TB/injectors) and a 239/254 Tooley stick
Makes 549/500 on a Mustang through an M6 trans

blake b

iTrader: (11)

I had a set on an LS3 block with 4.070 bore. With a Ysi, cam was 235/260, and 22lbs, I made 1026whp. The heads were 68cc.