I am looking for a link to a website and/or spreadsheet that will help me estimate the HP in my engine. The motor isn't anything too radical but I have done enough to it that I am gettin' curious about how much HP it has.

BTW - It is a Chevy engine.

post your specs. im sure a lot of us could get pretty damn close, plus Ill feed it through my dyno software.



edit: by specs I mean cam lift, intake and exhaust, duration @ .050, lobe sep, compression as close as possible, what heads, casting number preferably, valve size, any work done to them, headers, exhaust, intake, carb, EVERYTHING.

I mess around with desktop dyno 2000 alot. It seems to get some crazy ideas sometimes though. For instance it thinks increasing compression 3 points will make more power than running a blower with 10psi boost.

Charlo

this is true. I use it more for hp and torque curves than anything else.

post your specs. im sure a lot of us could get pretty damn close, plus Ill feed it through my dyno software.

edit: by specs I mean cam lift, intake and exhaust, duration @ .050, lobe sep, compression as close as possible, what heads, casting number preferably, valve size, any work done to them, headers, exhaust, intake, carb, EVERYTHING.

Here is my best shot at everything.

It is a Chevy 350 bored .30 over
ported and polished old school small chamber "camelback" heads (63cc I think) with 1.94 valves
Harland Sharp Roller Rockers
Edlebrock performer Rpm cam - Prt #7102 (http://www.edelbrock.com/automotive/index.html)
Edlebrock Performer Rph Manifold - Prt # 7101
Edlebrock Performer Carb (600 cfm) Prt # 1406
Hooker Headers
Stainless exhaust (no cat's) with two 50 series 3 chamber flowmasters
& lots of pretty aluminum stuff.

I appreciate the help - it isn't a BB or even an that amazing of a SB but I am curious. It feels strong. Let me know if I missed something.

Things like actual head flow numbers and your compression will make a difference but with a generic head and 9.5:1 yields a max hp of 328 hp @ 5500 in the old desktop dyno and 371 lb-ft at 3000 rpm. Should be a good low end torqey motor. This is under optimum conditions. depending on heads and what kind of tune you have on it it could be more or less but thats a pretty good estimate. Your good number is the torque. peak hp at 5500 doesnt mean a whole lot in a 4x4 unless your mud bogging. What you want is off idle torque because its a heavy blazer. You're doing pretty good. I had a similiar setup except a lesser head, and intake but in a 406. with 3.73's and 33" tires in a 3/4 ton pickup I could boil my rear drive tire (one legger).

I appreciate the help. I did a little more research on the heads today.

My heads are the "double hump/ fuelie" style of SB Chevy heads. They are not tapped for accessories. I pulled the valve cover and looked up the casting # on my heads. It is #3782461. According to my casting #'s book that means that they came off of one of the following vehicles:

A 61 Corvette (275 or 315 hp)
A 62 Corvette (300, 340, 360 hp)
A 62-64 "passenger" (HI PERF)
A 62-67 Truck (Light Duty)
A 63-66 Corvette (all 327's)
A 64-66 Chevelle (4 BC, HI PERF)
A 65-66 Chevy II (4 BC HI PERF)

They are also stamped with a "64" and a "C 10 5". It is my understanding that they C = March, the 10 = the 10th day of the month, and the 5 = 1965. However, I have also heard that the "64" = 1964. I am not sure what the heads are but if I was guessing I would bet that they are from the 275 horsepower 327 that Chevy made a bunch of from 66 to 68.

I have been told by a machinist and a friend that have been around my engine that they both feel that it has 10:1 (or higher) compression. However, I have never had it tested. I can hear a slight ping and I only run premium fuel.

If its pinging I hope to god your pistons are forged. Even then You wanna do something about that. retard the timing a little. You dont want any pinging. it will slowly eat the tops out of your pistons and if they're hypereutectic they'll damn near shatter like glass under bad ping. Hypers HATE ping.

If I plug 10.0 compression into my software and throw some "mild port" type stock heads into it it yields 364 hp and 404 lb-ft. Again these numbers could be way off but they dont sound out of the question to me at all. If the port work is decent in your heads and and everything matches up, a good tune could get this kind of hp out of a motor like this. This is a typical street rod type street motor, Ive wrenched on many like this. Thats a great cam for a 4x4. its got about 230* of duration @ .050 and thats almost perfect for maximum torque potential. The only other true way to make a lot of torque is with cubic inches.... or... NAWZZZZ DAWG!

It it is pinging, get some fawking better fuel in that and back it off a very little bit! You will lunch your pistons right now. Even forged slugs don't like pinging, but will take much more of it.

It it is pinging, get some fawking better fuel in that and back it off a very little bit! You will lunch your pistons right now. Even forged slugs don't like pinging, but will take much more of it.


What options are out there for better fuel? I already run premium.

what is your timing at?

Only choice for better fuel is if you can buy 100 at the pump but thats almost 4 bucks per gallon down here in CA. You could try additives but that gets expensive also. cheaper than a tank of 100 though. might try it.

Pull a couple degrees of timing out of it and see if it likes it better.

I am at 8-9 degrees BTDC.

What are some of the additives that you know give good results?