Offshoreonly.com - More Torque out of a 496?

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Quote:

Originally Posted by Holy Smokes (Post 4757774)

I recall way back they had their own racing division just using the HP3 Vortec engines. For testing, Merc strapped a test boat down and ran it for hours & hours on end just trying to break them.

It'd be nice to get my hands on pair.

Here they are. Yes the 496 was the only BBC to last the 300 hour dock test. 300 hours WOT. 55 minutes WOT 5 minutes idle.

I have the HP3 heads. They have 108-109cc head chambers. Raylar says they flow as good as his aluminum heads. I have to agree.

https://cimg7.ibsrv.net/gimg/www.off...4ff87d2e0.jpeg
https://cimg8.ibsrv.net/gimg/www.off...b41a41911.jpeg
https://cimg9.ibsrv.net/gimg/www.off...26960980b.jpeg

How did they get those flows? Is that based of a stock head with CNC? I heard the jackets were .020 away from going thru....

Quote:

Originally Posted by Keith Atlanta (Post 4757781)

How did they get those flows? Is that based of a stock head with CNC? I heard the jackets were .020 away from going thru....

thicker casting head, PSI uses them now.