mallie

Anyone got a power curve/dyno sheet for the L76 stock?

jerhofer

I had my motor rebuilt stock. Attached is the dyno sheet.

http://forums.corvetteforum.com/atta...dyno-sheet.pdf

mikey

was that an engine or chassis dyno?

mallie

Thanks.
I thought max hp was at 6200rpm though.

jerhofer

Engine dyno.

Nowhere Man

Nope GM would never build a production engine that carried a warranty that reved that high to reach max power. Red lines are dictated by about when the lifters will float and when parts are going to fail

62Jeff

Correct. In 1965 the L76 made 365 Hp at 6200 RPM, and 350 lb-ft of torque at 4000 RPM.

I have a factory engine dyno graph in a 1965 Corvette Specifications document, produced by GM in September of 1964. I can scan it tomorrow if someone else hasn't posted the chart by then.

DucatiDon

What does 370 on an engine dyno equate to in the chassis?

About 320? 260?

62Jeff

Turns out I had an electronic copy of the specs as well as a hard copy, so I did a screen grab of the dyno chart.

62Jeff

Bump.

Mallie is this what you were seeking?

mallie

where the power dropped. looks like 6600rpm.

-Matt

Powershift

About 300 RWHP if you are running a manual trans car. For an auto trans, the RWHP would be a bit less.

Larry

Powershift

That cam and engine will make excellent power through 7000 RPM. But the stock rods and valvetrain may have issues on an older engine. I would not attempt on your car without better understanding the car's history.

In a modified 1969 Z28 302 cid engine (basically same engine with a shorter stroke) we routinely ran to 7000-7500 RPM on the street with no issues. Made great power all the way. Had a 4:88 rear gear to help it wind up.

A good set of 4 tube headers with low restriction mufflers are needed to get the maximum out of this cam on this engine.

Larry

65tripleblack

That's true depending on how the engine was equipped while on the lab dyno. Normally, lab dyno tests with headers feeding low restriction mufflers. Other items like inlet airfoils instead of air cleaner, lack of alternator and power steering accessories might produce numbers somewhere between the old gross and more accurate net numbers.

Deduct another 0% - 15% for equipment deviation from "as installed" configuration.

Powershift

Wasn't fully awake yet when I posted my response. I should have explained it better......as back then (1960's) the factory HP numbers were often "optimistic". SAE-net HP ratings didn't happen until around 1971-72.

The factory also frequently played games with the published HP numbers to help out the marketing folks or the factory sponsored racing groups.

Larry