Large valved 273

oldkimmer said
The 2.02 will cause reversion because of the air bouncing off of the deck. If u want a 273 to perform build it like the old D dart with a modern cam and 302 heads. Kim

Now I'M not following the reasoning here ???? (But hey, nothing new there!) The 273's 3.625" bore is so small that even with a 1.88 or 1.94 valve, that's gonna happen. That bore is smaller than the head chamber and you're gonna get this effect to some extent or another. Even 675 heads for the 273 and 318, does not change that; the chamber overhangs the deck. I would have to check to see if a 302 chamber did the same but I am pretty darned certain that it does.

See here for a 675 chamber on a stock 273 bore; you can see the shadow line of the overhang of the chamber. (The white disc is a simulated 2.02" valve head.)