Does any one think that the TPIS ZZ-409 can make 480 fwhp in a 383? The heads are AFR lt4 195cc that have been cnc ported. I was looking at Golen Engine service and they have a 383 that they claim will make this kind of power under 6000rpm. The cam is 226/226 .520 .520

I would think the cam is too small, but I'm not a cam expert by any means. I'm interested in everyones opinion. Thanks--Rob

 

With stock heads and bottom end I made 351hp at the wheels with mods in my sig. Assuming 20% drivetrain loss(automatic) it equates to 422fwhp.

 

Any one else?

 

I made 486 flywheel on a 381 with a 230/242 114LSA 0.590/0.590.

Why are you looking at single duration cams? The LT1 seems to like a split duration with at least 6deg extra on the exhaust side.

 

A 383 should make over 400 at the rear wheels and a good bit of torque with a cam similar to that. I'd go with a custom grind.

-Mindgame

 

This is esentially a $6500 "crate " motor(long block). I like the idea of one stop shopping. It seems like a pretty good deal compared to what it would cost to build your own, the AFR 195 competion ported are like $2200 alone. So a forged bottom end stroker for $4300+/- seems pretty reasonable. Am I way off here???? The cam seems small to me, but wouldn't this be pretty decent for a torquey street motor?

 

ttt

 

I agree.

You can then get a cam which will optimize your 383 for what you want it to do. If a torquey street motor is really what you want, the correct cam is essential.

FWIW, and IMO, that's a lotta ($) bottom end for 500 fwhp @6000. Unless you plan to add LOTS of nitrous, a good Scat cast crank would be more than enough when combined with reasonably priced forged rods and pistons.

My $.02