question on horsepower amount
 

i am about to start building a 408 to put in my mustang. i am running a 4.0 crank, 6.2 rods, keith black pistons that have two valve reliefs that are 6.5cc. i am looking at getting edelbrock aluminum heads from summit that have 2.05 1.60 valves with a 60cc combustion chamber. put it in this formula thing and it will be right at 11.9:1-12:1 compression ratio. so my questions with a healthy cam choice good for the road what kind of power do you think i will be making?

There's a lot of variables that come into play here that make accurately predicting power output a pretty tall order (typically always is).

Cam choice will be a big factor ... carb or efi will make a difference, as will the exhaust.

Don't forget that the only numbers that really matter are on the time slip not the dyno sheet ;)

oh i know. streetable too. i am prob going to be looking for a cam with high 500s low 600s for lift, will stay efi with i am figureing 42s just to not put a strain on a 255 pump. maybe a 100 shot just for the track later down the road

Get a dished piston if you want to run pump-gas. Also, use a spider-style intake (converted to EFI) with a throttle-body/elbow on top. With the right cam, and a little work on those Victor Jr. heads, it could make well over 500hp. On pump gas.

well i have an edelbrock performer upper from the 302 and i just have to get a base for the 351

A Performer Intake?! On a 408?!? :think:

then you need to add another choice: 350-375hp. :nono:

Ditch the Performer. It won't perform well in that application.

302 parts on a 400+ cube stroker will make 302 power, If you use an Eddy Performer on a 408 its going to be done about 4500rpm. 2 words, Cross Section!


So far 1sicklx and Matt are dead on!

HP prediction: Too many variables to make a prediction, But the way youre headed it would be fun in a tow truck or daily driven 4X4.

Camshaft: There is way more to a cam than lift and duration, Lift and duration are a by-product of timing events and lobes chosen. A good cylinder head needs good clean charge of fresh air, This means little to no overlap and the use of faster ramps. Advertised duration and duration @ .050 gives you an idea of how fast or slow a ramp is as does LSA. Cubic inches, Total combo and desired operating parameters dictate the cam needed. Optimal for a "Streetable" application is a wide Tq curve, This means you have to be careful picking your parts or the camshaft will have to crutch a poorly chosen combo.

Streetability: This is like asking opinions because everyones perception of "streetable" is different, Mine is if it will idle its streetable.

Intake: Dale has my old Probe/CHP EFI Spyder and I think he is looking to sell it, It is new and is not a Chinese knock-off(original Eddy Vic Jr.).

:hmm: for a tall-deck motor(351W)? :think:

Yep, Fits a 9.5 deck block.

I agree with the others.

Cam decision will decide whether it makes 370 to the wheels or 550 to the wheels