How much estimated horsepower?

[1974vette]

I have the stock 350 L48 engine in my vette rated at 195 hp. When I had it rebuilt, it was bored .060 over. I also put a Holley 650 double pumper on it because the old carb wasn't fixable. I also have flowmaster 40 series mufflers with 2 1/2 inch pipes running through stock manifolds. I plan on getting headers later but I'm trying to finish getting my Vette able to be a daily driver. Could anyone tell me about how much HP they think it is producing?

 

[Robin7TFour]

did you change from the stock cam profile? and were there any changes in the heads?


robin

 

[Hib Halverson]

A sixty-over L48 with a Holley 650, 2.5-in. pipes and Flowmasters, provided the new Holley is calibrated properly, will make about 210 hp.

However, expect some driveability compromises with the mechanical secondaries on the street.

That's a big carb for an L48 and mecanical secondaries will make the carb's "bigness" even more pronounced.

 

[1974vette]

well...here's the story...the vette was going to be my dad's when he bought it but one day i was riding with him, he told me that if i wanted it, i could have it but i'd have to sign a contract with him and i'd have to pay him back every cent...he wasnt going to give it to me..and after i paid it off, he'd put the title in my name...well...that was over a year ago. im 15 now...(yeah, i know, im EXTREMELY lucky to have this car) and when my dad had the motor rebuilt, i wasnt informed of what he was having done to it. i doubt they did anything with the heads...possibly a mild cam but im not exactly sure. but thanks for your help everyone.

-matt

 

[MaineShark]

You can always just find a dyno and take a run

Just remember that you're getting rear-wheel horsepower, not crankshaft horsepower, so you need to estimate the drivetrain losses.

Joe