Mayhems 71 Nova

[Mayhem]

The new model Holley "HP" carbs work very well and look good too.

[miket1]

The Nova looks great, how do you like the new Holley HP Carbs, is the idle quality greatly improved from the older version carbs.

[Mayhem]

Thanks.

I am still tweaking it a bit, as I replaced the plugs to a little cooler plug the day after the carb, and am in the middle of doing the plug wires. I had some trouble getting the right plugs, as it is an '80 Vette motor, with aluminum heads. There are several options, which include a shorter and longer plug. I ended up going with the longer one = AC Delco 41-602 gapped at .045. The old ones were gapped at .041, so it runs a little different now.

But yes, it does seem to idle better, or at least make the cam lobe more of a gallop.
I had it burning tires through all of first gear and into half of second before I changed plugs. Now I have to tweak it again to get it exact.

I looked at the "Avenger" models with the pretty anodized body, but the HP version was more like a Dominator, with 4 matching barrels instead of the stock looking butterfly primary portion. The HP's have no choke, are mechanical secondaries, and are "street/strip" rated with an all business design.

[Mayhem]

P.S. &quot;burning tires&quot; into second gear on pavement equates to the picture at the top of this page for what it will do on a well treated track! [img]<<GRAEMLIN_URL>>/smile.gif[/img]

[Mayhem]

<span style="font-weight: bold">When you feel like running no hood.....</span>

[miket1]

I need 2 of these for 540 cu. inch Merlin engines on my Fountain Powerboat, I am looking for good idle qualty, Holley says with the 4 corner idle adjustment &amp; new designed air bleeds that at idle it is more tunable and sharper, that is what I was curious about compared to the older version Holley carb.

[Mayhem]

Mike, as you state, with the 4 corner adjustments, once you get the floats happy, they are awesome, and seem to be much more responsive and fine tuned than say a Demon.
They of course have the interchangeable power valve on the primary as well.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: miket1</div><div class="ubbcode-body">I need 2 of these for 540 cu. inch Merlin engines on my Fountain Powerboat, I am looking for good idle qualty, Holley says with the 4 corner idle adjustment &amp; new designed air bleeds that at idle it is more tunable and sharper, that is what I was curious about compared to the older version Holley carb. </div></div>

[PxTx]

My sister has an HP on her camaro, it probably 8 years old. It is def richer out of the box than a standard Holley.

The air bleeds make it a lot more tunable. If you are going to run two of them, you'll have to really look at the idle circuit. May be able to rune wiht a bleed, if they give you thant ability. When my dad and I tune the old 1850 600 cfm carbs for dual quads we would tyically put a small restrictor wire in the liquid line of the idle circuit in the metering block.

[Mayhem]

[PxTx]

Looks like you're having fun with it. What is next, dealer tag frame?