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Both are better than mast. Seen a LS3 Mast headed 440 LSX at LS Fest. It rained like ****.... but that's not my problem.
Mast is a RIP off....
https://ls1tech.com/forums/generation-iv-internal-engine/1891305-mast-black-label-head-failure-20k-motor-destroyed-need-help.html
Last edited by Tuskyz28; Sep 11, 2018 at 05:38 AM.
I did the same thing I bought a used set the only way to tell is by getting the hand engraved number from under the rocker arm pedistal Idk if its on both heads or just one. Then call texas speed they work better that way trust me lol. You can barely see it in the pic because its so fine and the flash hid it. I believe it was a 5 digit number.
I don’t remember. Mast had something about it a few months ago. Quite a bit quicker than TFS cars
Been on Google looking. I'm starting to think you need a diaper on cause you full of **** cause I see nothing. A link or a picture of the car would be helpful.
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PRC Heads ?? 
