Looking for a HP estimate...
 

I am in the process of finishing my motor up. I did a total engine rebuild in school, and I was wondering what kind of horsepower I will be getting. It is a '72 350 with hypereutectic pistons, moly rings, CraneCam 266, and stock rebuilt heads. For now I will just be using the stock intake, exhaust and 2 bbl carb. What do you guys think the horsepower will be for this motor? And what would you estimate it to be with a Holley 770 street avenger carb, street avenger intake, hooker headers, and true dual exhaust with flowmaster 40 series mufflers? You probably have no idea and wonder what I'm smoking for even asking, but I'll try anyway...

if it is around 9.1 compression Id have to say 250-310 range, but thats just a real rough guess

with all the stock stuff maybe 260 horsepower. with the goodies probably 280 maybe 300

Yup, that sounds about right...

I just posted a thread titled Vin Decoder. It doesn't list a 350 with a 2 BBL Carb. But a 350 with a 4BBL carb in '72 put out 175 to 210 HP...We can thank the Government for that. I looked up my '70 and it put out 255 hp stock. A new intake, headers and flowmasters should make a big difference for you. BTW..stock compression ratio in '72 was 8.5:1

I plan to add aluminum heads sometime in the near future. I hope the stupid thing puts out more than 200 hp after all the money I have stuck in it so far...

The 72 HP ratings were for "net" HP. Prior to 71 the ratings were for "gross" HP. The net ratings are actually closer to flywheel horse, rather than bare crankshaft horse. I recommend finding a stock 4 bbl carb, and intake, as the 2bbl is going to really restrict the performance with the pistons and cam. If you can't find a stock setup cheap around home, I have one on a vintage 69 motor you could use till you up grade. I won't be needing it for a while, but will want it back when you change over. PM me if you are interested.

first of all...aluminum heads will not make more HP than cast...They will make more than stock however. You are probably around 260-285 HP. This is what the most powerful SBC had in the late 50s early 60s from the factory. This 285HP is what 90% of people will say that their engines is making 350-400HP. With 285HP you can run mid 14 second 1/4 mile times. It is expensive to make a lot of HP. Remember...GM with all of its resources could only make 360HP with a 350...This was a solid cammed 11.5-1 100+octane no lowend power no power braked facory drag engine...and this was with the old school HP raitings...the new ls1s make big power...but they are very HI tech. If you want to make a true 400HP+ 350...email me..I have the info...but expect to run race gas...

:bowtie:

BIGJIMZIII -- TRUER WORDS WERE NEVER SPOKEN. IT SEEMS NO ONE UNDERESTIMATES HORSEPOWER..... OR GAS MILEAGE.
:D :D :D JOHN

The equation for HP is

" Speed cost's money.How fast can you afford to go?"

Thanks for all the info everyone. I forgot to mention that I had the motor bored 30 over, but that probably doesn't make much, if any, more power. What is the displacement of a 350 bored .030 over?

355