[Formulajones]

So in a nutshell, from what I understand, in the last dyno session, they were able to use the carb that Jeff built specifically for your combo.

["QUICK-SILVER"]

Originally Posted by Formulajones

So in a nutshell, from what I understand, in the last dyno session, they were able to use the carb that Jeff built specifically for your combo.

In a nutshell the OP doesn't know how much torque or HP the engine originally made "as delivered". Paul never shared that info. He did post that it made 517 HP, with the 870, "BEFORE" it got jetted up. Can't read numbers in the you tube vid after jetting. Only dyno printout the OP got was what the engine was "capable of" with a Jeff carb.

What it can do VS. what you've got didn't make any sense back then and still doesn't to me. You'ld think what the customer paid for would be more important.

Sheets posted now show power is down (way down in some areas) with the new Jeff carb compared to the first Jeff carb. That tells me the new "specifically for your combo" carb isn't doing what it was suppose to do.

Clay

[Formulajones]

Originally Posted by gtofreek

Since the engine was full of oil, the guy setting up the engine didn't install the oil temp probe. It has to go into the drain plug hole.

First dyno pull was with one of Jeffs carbs built for another guys engine. This second dyno sheet was with the carb Jeff built specifically for this engine. First dyno was in the fall when temps were cool. Last pulls were done in the heat of summer.

^^^^^^^^

Originally Posted by "QUICK-SILVER"

In a nutshell the OP doesn't know how much torque or HP the engine originally made "as delivered". Paul never shared that info. He did post that it made 517 HP, with the 870, "BEFORE" it got jetted up. Can't read numbers in the you tube vid after jetting. Only dyno printout the OP got was what the engine was "capable of" with a Jeff carb.

What it can do VS. what you've got didn't make any sense back then and still doesn't to me. You'ld think what the customer paid for would be more important.

Sheets posted now show power is down (way down in some areas) with the new Jeff carb compared to the first Jeff carb. That tells me the new "specifically for your combo" carb isn't doing what it was suppose to do.

Clay

I think you're looking at it backwards Clay or there is a misprint. Either way, As you can see Paul confirmed exactly what I remembered Paul told me. The carb specifically built for the combo is doing better than anything tested to this point. It's pretty common for Paul and Jeff to swap some carbs around for customers to show the differences and show what Jeff can do. Usually that means they use one that is available at that particular time that is tailored to another engine to give the customer an idea. Even with that said, many times they still produce better results than anything you pull out of a box.

Paul is a modest guy and won't brag, but I'll say it. Jeff is likely one of the best Holley carb guys in the country and I've been lucky enough to meet him. Super nice guy. He built Holley's for a few of the Nascar Cup teams before they went fuel injection and also ran his own Holley business throughout the 70's if I remember correctly. I wouldn't hesitate to run Jeff's carbs on my stuff..