oamhmad

I need to insulate my Holley a little better. What's the thinnest carb spacer I can get? I'm running an air gap manifold under a TA hood so clearance is an issue.

pancherj

I have an airgap with a 1 1/2" spacer and it clears my stock IROC hood (barely). The trick is to use a corvette L88 drop base air cleaner and a 3" filter. I bought a reproduction filter base for something like $50 a few years ago. If using an HEI, the rear of the base will need to be "massaged" a little to clear the cap.

TreeFiddy

Here's a couple of 1/4" ones on Summit:

http://www.summitracing.com/search/P...rd=carb+spacer

oamhmad

Did you notice any performance decrease with the drop base air cleaner? where can i get the l88 cleaner from?

Aaron_SK

Drop base air cleaner throttles the hell out of your flow if you have a choke horn on the carb.

Get a 1/4" or 1/2" phenolic.

92z28outlaw

yup, 1/2" phenolic and a drop base still cleared my stock hood but my wing nut rubs if i dont posistion it correctly, more importantly it reduced the heat transfer from my manifold too carb dramatically

84TransAmNY

Just dropped my engine in and looks like I have a possible clearance issue. Whats a good drop base for a 4 barrel quadrajet.

Damon

You can stack up a short pile of the regular thin gaskets to get EXACTLY the spacing you want as well. The contact area is large and they won't try to squirt out the side or distort.

I doubt you'll find much improvement, however, considering you already have an air gap-style intake.

Also I should mention that much of the heat is NOT conducted through the gasket. Even a paper-thin stocfk one. Most of the heat transfer is heat that is RADIATED from the intake into the fuel bowls overhanging on either end. THAT requires more than just a thick gasket to fix. You need a carb heat shield. Cruise Summit's website. You will find what looks like a metal plate with a carb flange opening in the middle. That puts a heat reflector (the metal plate) between the top of the hot intake the the underside of the carb's float bowls. They work extremely well. They also add almost nothing to the total carb height.

I am not going to kid you, however- getting one to fit up with various vacuum lines, fittings and throttle/kickdown linkages often requires modifying it to clear everything. But that's the part you really need if you're truly serious about keeping intake heat away from your carb.

pancherj

No performance decrease that I could see. My car has gone 11.89 in the summer heat with that air cleaner setup. I bought mine on-line. Just google search for L88 drop base air cleaner. You'll find it. Currently, I fabbed a ram air intake by using the stock TPI intake and some fabrication work to mate it to the drop base air cleaner. That made a big difference in SOTP power.

oamhmad

Is this what you are talking about?

http://www.summitracing.com/parts/HLY-108-70/?rtype=10