OSO member "WETTE VETTE" did over 1000hp with a N/A 632 I believe.

is it a pump gas engine?

Yes. But not for the faint of heart. He put together himself but of course need a good pocket for what was done. Think he ran well over 120mph in his single engine cat.

Do a search...you'll find it. I believe 598cid or some where around there.

Bbc_598 Craig Miscowicz
10.78:1 true pump gas 598.

Years ago I did a back to back run with and without my flame arrestor. I gained 0.00 mph by removing my flame arrestor. This was on a 500hp 502. But, my arrestor was the wire mesh kind which is the type I would recommend.

This is the one I had:
http://www.hardin-marine.com/p-14180...-arrestor.aspx

I really like mine.. pretty unrestricted.

That's what I'm talking about. Who makes that?

How much power did that thing make? And why the coated pistons?

[ATTACH=CONFIG]520490[/ATTACH]

These particular flame arrestors supported 1200 on the dyno. Installing them on, for the last pull, the engine lost like 4hp. Wasnt my engines in the pic that made that kinda power, but i wish!

On a max effort-ish N/A deal, you'll want to pay attention to the entry into the carb. Messing around on the dyno, I've seen a decent HP loss from those long flat flame arresters, even with the screens removed. There's even a considerable difference from just using different bases with no tops, with the flat ones being the worst. Air flow hates right angles.. If you imagine what the air looks like being forced into the carburetor, it's easy to visualize the difference between a nice tapered radius vs a flat plate and 90 deg edge.