I want to get some opinions on expected power numbers. I'm waiting on the turn around time for my long tubes and then this thing will finally be done. Here's the combo:

393ci 351w
9.7:1 CR
Fully forged rotating assembly
Trickflow TW 205's
Trickflow R intake
75mm throttle body
90mm MAF
42lb injectors
255lph fuel pump
Comp camshaft, .580/.580 lift, 236/248 @.05 dur, 114 LSA
1 3/4" Accufab long tubes
3" exhaust

Take a couple guesses and let me know what you guys think.

 

Maybe 400-425.......
That low compression is hurting the cam.
I'll run a program on it tomorrow and see........

 

ditch the 75mm tb, no reason to bottle neck it there, that may hurt it a tad

 

Thats what I was thinking. I was thinking of having the heads milled, theyve got 65cc combustion chambers right now. Is that the best way to raise compression?

 

The intake has a 75mm opening. Should i get a smaller maf?

 

Don`t change the size of the TB a 75mm can support that kind of air demand easily! It can actually help with intake airspeed....

You could use a 76mm MAF and keep the induction airspeed up thru the entire system!

I will be re-using my 76/75mm combo on my 351 stroker!

Take the venturi sizes from a 750 or 850 carb and compare the numbers to the 75mm tb not much difference in combined size!

I once posted the cfms on the different sizes of TB`s on here idk if it is still on here, numbers from the R&D from a major manufacturer of throttle bodies.


A 75mm tb can support upwards of 450 cubes unless your all out racing!

Do the common since rule here if your intake opening is at max 75mm anything over that just before it is a waste!

If you did want to run anything bigger and do it right you need to swap to the box-R upper then you can go to 90mm on the Tb.

Oh and my guess on the power is 404 rwhp!

 

let us know how well that works for ya'

 

^^^ sure thing!

 

OK, I ran the new program that I have on it but it's real new to me so I may have fed it some garbage (lol).
I had to use a CFM for airflow of the induction so I used 750.
I got the thing @ 487 HP @ 6000 with 485 FT/LB @ 4500.
Just a little stronger than I thought it was going to be.
I've run a lot of programs on my own carbed car and I know my numbers are just fine for the MPH it runs so I think these are at least close.......

 

This info is flywheel numbers BTW..........