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I'm doing something wrong because I can find both videos.
The first one is "Ford hybrid LS cylinder head". The second is "Ford 351 Cleveland Headed 300 6 cyl, 500 hp, by Bruce Sizemore, saw Lee Shepard smile as he passed"
Seems like it would have been only marginally more work to cut a deep V in the heads, weld everything back up and then re-bore those two head bolts you just filled in the process? It's not like having a plate in there makes it any easier to seal since you're just trading head to head sealing issues with heat to plate sealing issues.
He didn't address the fact that the pushrods angle out beyond the block. The top of the lifter valley has to be notched where the side cover gasket normally sits. A custom pushrod cover needs to be made to that not only covers the pushrods, but it must cover the bottom of the head that extends out beyond the 300 block deck.
The bore spacing on the LS block is 4.400" versus 4.480" for the 300 six. If you center the LS head over cylinders 2 and 4, the combustion chamber offset is .080" not .020" as stated in the video. The large spacing difference actually shows when he places the head gasket on the head.
It takes a three piece head to keep the valve away from the cylinder walls.
He didn't address the fact that the pushrods angle out beyond the block.
If you're already sending the block to be decked you may as well just build a triangular steel box around where the push-rods will go and let the head seal it from the top (drop a bead of RTV where the gasket isn't it's just crankcase pressure after all). But he didn't say he did that so he probably just hasn't figured it out yet.
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