How would the 454 R work on a mild 454 that dyno at 460 hp at 5400 ? Have stock alum Merc dual planes with Eldebrock 750 Marine carbs. Would low end suck? Most of time cruise at 3400-3800 rpm. Has good hole shot now.

Weiand Stealth, a dual plane manifold that will run in the higher rpm range like having a single plane. best of both worlds.
I had the floors on my rectangle port intake welded up 1/4" to match my wedged heads to increase velocity. my 468's made 590HP with this manifold.

http://store.summitracing.com/partde...8&autoview=sku

What cam, head and exhaust?

Interesting. Looks like the same of the Merc intake. I know that inside designs differ. Looks alittle taller than the Merc. Thanks for the info.

The Weiand Stealth was THE intake that was used back in the day when A and B class engines were limited to dual plane manifolds.


Cam ultradyne in. 252 ex 264 @ duration @ 0.50, lift 0.630 in., 0.630 ex
Heads: JimV (Valako race heads) fully ported and wedged Merlin rectangle iron heads 2.30" in. 1.89" ex. (most improtant ingrediant to the build). 9.6:1 forged JE SRP pistons, Holley Barry Grant 750's.(I need 850's to make 620HP) Stainless Marine exhaust.
570HP @ 5500, 590HP @ 6250