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Ron, While I don't remember how much angle the RPM Air Gap manifold has machined into it, 5-6 degrees "downward" in the front isn't always such a bad thing...and here's why: Under acceleration, dynamic forces acting on the fuel in the float bowls causes it to displace toward the rear...stacking...

Not specifically trying to be a wet blanket here, but... Practically all of the currently available engine simulation programs -- like Larry Meaux's PipeMax -- on the market today that are priced within the range of the average enthusiast have some shortcomings that become readily apparent...

I had some business dealings with Peter Knight several years ago. He always impressed me as being quite intelligent as well as a straight shooter. Glad to hear that he's still in business.

FWIW, the Winston/Nextel/Sprint Cup engines as well as BGN (now Nationwide Series) have both been limited to a maximum compression ratio of 12 to 1 for several years now. Generally, the combustion chamber in the C3 "Yates" heads mentioned in the ad are most efficient at around 52cc volume with...

Certainly, Jac Mac's method would work. When confronted with the need to use non-Vortec style intake manifolds in conjunction with Vortec-style heads, I've always found it easier to plug and re-drill the intake flange of the Vortec cylinder heads to accept the bolt pattern of the intake...

Ok, finally retrieved my digital camera from the twilight zone known as “the neighbors”. As promised (and if anyone is still interested), here is a photo showing the evolution of Holley center-hung float bowls over the past 45 years or so. The one on the top left is the earliest design that...

Jac, I’m not familiar with the balance passage-style FE manifolds you mention, but I can’t envision a design utilizing conventionally-positioned IDF/IDA downdraft carbs which would not create a boatload of flow turbulence and pressure wave management issues, not to mention that the runner...

Thanks Ron; that's exactly the kind of objective opinion I'm looking for here. While I've always loved these cars, I freely admit to being a "newbie" with regard to whim and preferences of this particular market.

Based on some quick, preliminary measurements of a local SBF-powered car, I think what I have in mind will fit without surgery, Howard. I'll reserve comment on the FE-powered stuff until I can measure one or get some hard data.

During my time as a member of this forum, I’ve noticed several reoccurring themes; among them, a general appreciation for the appearance, heritage, and drivability of Weber carburetors. Quite often however, two other themes accompany this one – those of having to compromise either low or high...

The Edelbrock Performer carbs work well in most applications if -- as Phil mentions -- they are properly tuned. The design doesn't lend itself to certain applications; larger displacement (430 cu.in +), short rod ratio engines with good cylinder heads and manifolds that present broad, deep...

Actually, the cause is improperly installed squirter check-needle seats (not pressed in far enough); another problem that has become all too common in the past few years. We've seen so many of them -- literally in the hundreds -- that I finally made a combination gauge and repair tool...

John, Mark, and Tom, Your questions are most easily answered with photographs, as there are some characteristics that distinguish a batch of float bowls that is particularly prone to having the problems I've outlined. I'll post some pics here soon...assuming that I can get my camera back from...

~Sigh~ Guys, welcome to the armpit of today's "global" economy. Holley has been on increasingly unstable financial footing since being purchased by Colt Industries in 1968. The first decade under Colt weren't really all that bad; Detroit was still buying hundreds of thousands of...

Russ, there are many possible causes for why a multi-cylinder engine can experience uneven fuel distribution. The problem can reside with the carburetor(s) themselves, the "environment" in which they operate (air box/air cleaner assembly), the design (or even the manufacture quality) of the...

Might be doable. What cylinder heads (and what deck height block) did you have in mind? Stan

Russ and Jac, I think I might have unintentionally confused you regarding the runner lengths. In an IR intake system, the cylinder “sees” the combined length of the cylinder head intake port, intake manifold runner, carb venturi, trumpet, along with any/all gaskets, spacers or isolators as...

Admittedly, this question isn't precisely GT40 related...but I've noticed over the years that many of you here have a lot of practical experience using Weber carbs, and I hope that I can benefit from some of that experience. I recently undertook a project to design and develop a plenum-style...

Julian, does the sound you are hearing have two distinct, focused "knocks" per crankshaft revolution? The bearing backing material shown in the photo, along with the general heat coloring of the carnage looks like a rod bearing to me...I'd strongly suspect #s 1 and 5 in a wet-sump Ford with an...

Oh. 8.2...as in 8.2" deck height, not 8.2 L. And here I was thinking "Yes! I'm really starting to like Chas! They've already completed a 490+ cube alum. Man O'War small-block!" Darn.