ok thanks for the dyno where do you get a desk top dyno. and to get hp and tq you need a good top end heads,cam,intake,and carb have you heard of any news about rhs heads from summit racing hear is the part number 35301-01 tell me what you think.

 

Yes, it's all about the combo, parts that complement each other. I have nothing on the RHS heads though...

 

Tri-State Cylinder Head - Chevy, Ford, Small Block, Performance, Aluminum Cylinder Heads

Tri-State Cylinder Head - Chevy, Ford, Small Block, Performance, Aluminum Cylinder Heads

If you don't want to spend a wad of money in heads.

 

Hmmm... A little less HP than the book listed, but the torque is right on. My desktop dyno is pretty crappy and I haven't spent much time with it, or gotten any cam software for it. It usually specs out a little more HP than reality, IMO.
I hadn't thought about running that build through my desktop, but when I did it spit out the torque curve that looked exactly identical to yours, but about 410 HP at a little higher rpm peak.
I have to plug some pretty generic stuff into mine, (especially the cam and heads) but between your dyno and mine, I can believe the 390ish HP they claimed is possible.
I have also thought that was a little high for the parts, but gave them the benefit of the doubt. They actually listed a XE282H as well, but listed the XE262H and referred to another build with the XE262H as the same cam, so it's possible that it should be the XE282H and that may boost the HP on your dyno.
It's obvious that one of them was a typo, but maybe it was the 262. If you have some time to kill and feel so inclined, try punching in the XE282H and see what HP it pops out.
In case this doesn't make sense to you, this is the build I cited in the "HOW would you build a 351W" thread.

Oh- and try punching in open headers, I doubt they ran mufflers on the dyno.

 

If you're at all serious, you'll go with a stroker crank and a roller cam. I didn't see what RPM you wanted to make this horsepower at, but because it's a truck, I'll assume you want it at the lowest possible RPM. A 408 stroker can make 350 HP and better than 400 ft/lbs of torque.

GT40p heads aren't going to be the best choice. I'd be looking at C9 or D0 heads or similar and I'd be doing a home port and putting in 2.02 valves.

You can do it, but you have to be smart about it. Again, a retro-fit roller cam is the way to go. Get your heads and displacement figured out and then get a custom cam designed for the head flow.

 

That's the problem with this program, it's based on Chevy motors so you won't get accurate results for a Ford unless actual head flow numbers and cam specs are used. I entered flow numbers I found on the web, I have seen several examples posted for many of the Ford heads so I think they are close enough to be considered valid. But even then there is enough variation between the real castings(heads and intakes) to make considerable difference to the final result, so it can only be considered accurate to within +-10%.

I'll give that a go when I get the chance. That cam above is the XE262H, so I expect the XE282 will indeed make more hp but at the expense of low rpm TQ.

 

There is no XE282H.. but there is an XE284H. It produces 380hp on the same combo above. Maybe you mean the XE282HR.. which is a roller cam?

 

That's always a problem with book stuff, you know somethings wrong, but you can't tell for sure what. In the description it says; "like our 395hp 351W it has a 10.5:1 compression ratio and a Comp Cams Extreme Energy 282 like we used on the 450hp 302. The Extreme Energy 282 is an aggressive, hydraulic flat tappet camshaft with a tolerable idle and brute torque right off idle." In the list of parts under it, it lists the cam as a XE262 hydraulic flat tappet.

The 450hp 302 lists a Comp Cams Extreme Energy 282 hydraulic roller in both the description and parts list.

The 395hp 351W lists an "aggressive flat tappet hydraulic camshaft from Comp Cams" in the description and "Competition Cams, specs unknown, Aggressive hydraulic" in the parts list.

 

ok I am going with the 393 stroker kit now I am prbably going to bore th cylinders .030 over. for the top end I was going to use eldebrocks power pachage top end kit 400 hp 412 FT. LBS. OF TOURQE PART NUMBER EDL-2092 now would this be a alright. I would like to see what the numbers would be like on the desk top dyno but I dont have . well tell me what you guys think and info will help.

 

o by the way would a 650 carb be ok with this or should I go bigger.

 

I think you'll like it.....

 

It will probably be on the small side, but not extremely so. A larger carb will help a little more on the top end, but will cost more to run as an everyday driver.

Most carb sizing charts will list 600-650 CFM for 400 ci. for stock to mild performance and 700 CFM+ for racing.

 

yeah that dyno is nice just what I wanted but I would like the peaks to be in the lower rpms like the 3500 to 4000 rpm is there a way I could do that or not ? Or how would you go about making the torqe and hp in the lower range of rpms?

 

That's the cam, it's a bit much for a truck application IMO, let me see how it responds to a cam with a bit less duration..... Back in 10 minutes..

 

OK here it is, I used a couple of the preloaded cams in the software with 262 and 268 advertised duration, versus the 290 duration of the Edelbrock cam. Both these boosted and flattened the TQ curve and lowered peak HP to about 5000rpm.