I always thought I had a pretty powerful truck for what it is. But it never really put out the performance that I thought it should....

I've been talking to a guy that has computer dyno software. We've been working on getting all the details put together and getting a more accurate number. But so far, the estimates have been disappointing. My 351C is only putting out around 260HP, and somewhere around 340TQ.

Seemingly low, but beliveable numbers when I think about it.

I'd love to get 350-400HP pumping out. With 400+ torque. Gaining 100 hp or more would make me happy. We'll see what happens. Probably nothing, as it runs and does what I need it to. But maybe something. I might swap some parts, or I might even build my spare engine. 393 stroker????

 

What software does he have ? shoot me all your specs , the more the better and i'll run them through Desktop Dyno 5 . I have to install it on my new laptop so it might be a day or 2 .

 

4.030 bore, flat top Pistons with 2cc valve reliefs, about .040" down in the hole. 79cc head chambers.
Edelbrock 600 carb
Edelbrock performer dual plane intake
Summit racing 5200 cam(edelbrock copy)
http://m.summitracing.com/parts/sum-5200
Factory exhaust manifolds with dual exhaust.

Anything else you need?

 

cam # or specs for cam

 

Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:1,200-4,500
Intake Duration at 050 inch Lift:204
Exhaust Duration at 050 inch Lift:214
Duration at 050 inch Lift:204 int./214 exh.
Advertised Intake Duration:282
Advertised Exhaust Duration:292
Advertised Duration:282 int./292 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.486 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.512 in.
Valve Lift with Factory Rocker Arm Ratio:0.486 int./0.512 exh.
Lobe Separation (degrees):112
Computer-Controlled Compatible:No
Valve Springs Required:Yes
Camshaft Manufacturers Description:Smooth idle, low-end torque, towing, good fuel economy in stock engines. Good camshaft for turbocharging

 

got it , i'll have results by Monday , gotta find keycode for DD5 to put on Laptop.

 

Hey Garret. Those .040 down pistons. What compression ratio was advertised with those?

 

With the big open heads, about 8.75:1. I didn't think about that when I bought them. I was just building a stocker engine. If I was gonna do it over again I'd get some that would do 9.5 or 10.

 

I have a set of Australian heads with small closed chambers. Those would bump me up to over 10:1. But they are totally bare, and I estimate $600 to get them in running shape. I want to, but don't really want to spend that much money right now. Maybe later this year I'll swap heads and get headers. That would get me up around 300+

 

Ah. There lies your problem grasshaappa.

 

As Elwood said, "so it'll run good on regular gas"

 

ohhhh 8.75 cr can you use thin head gaskets to bump it alittle ?

 

Shave the heads and shorter pushrods?

 

Ok found software and license , after a little tweaking to get program to work with Win 8

 

this was done with 8.75cr I played with CR in DD5 from 8.75 to 9.5 no big change in HP/TQ i then put CR back to 8.75 and changed exhaust to headers and dual exhaust 50hp difference !! so I'd say ditch the stock manifolds and get a 2.5 dual exhaust hooked up . I'll post the rerun so you can see the actual difference