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I presume it's a blueprint engines crate motor? if so, it should have OEM magnum heads...cam looks to be a MP .474" cam. a cam change to a comp XE285HL with a spring change to hughes #1110 with hughes retainers would probably open up a lot of power...

that said, the RHS head flow ~25-30 cfm better than OEM magnums, so I'd swagger with no other changes you'd see a 40HP increase with the heads. the cam is the limiting factor right now, IMHO.

The cam is a comp grind it has a split duration. Correct they use oem magnumheads however the block is an LA style not a magnum "directed to the OP". Best thing to do before you evenpurchase heads for this engine is tear it down. I along with other members of this board have had and found many problems with this engines.

Heads came with stock springs and worn out guides. Even though advestised for matching springs.

The piston rings have been found to be the wrong sizes installed.

Plus the fact they don't stand by their warranty.

If the motor was built correctly to begin with it should have been close enough a tad over a 400hp engine.

that said the RHS head are a great upgrade