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You're correct, I've ran several carb hats, from the extreme velocity to the spectre, typically, you want the largest spacer you can between the carb hat and the throttle body or carburetor to straighten out airflow. Never run the divider, they can cause issues with fuel distribution. This hat...

100% correct. Gale Banks has ran similar tests. The OEM snorkel intake assembly on this truck was pulling in superheated air, directly from the radiator. I went out with a temp gun last night, the top of the hood was 20° hotter where the OEM breather assembly was. Inlet temps are 25-30°...

Quick update, worked perfectly using a 1.5" aluminum spacer and a few makeshift brackets to the inner fender. Checked for air leaks with carb cleaner, none. Even has a fitting in the air hat for the factory PCV. Removed the inner divider in the TBI air hat, that's it. Not the prettiest...

Also, failed to mention. Make sure the mechanical fuel pump you purchase, has true 3/8 inlet & outlet ports. For my 470", I found an obscure, NOS 1968-1969 Chevrolet Corvette fuel filter with the vapor return line. Filter Part # GF-432 / GM part # 5651480. Went through a lot of trouble as this...

3/8 feed and 5/16 return. May as well upgrade, no reason not to if you're replacing fuel lines.

This one has a stud, no clamp. It's interesting for sure, most people go the other way, which to me, doesn't make a lot of sense. Large round, open air filter element, under a hood, with an engine that's now ingesting 30-50* hotter IATs than ambient. Take out a temp gun, I believe many people...

Recently purchased an entire air-intake assembly off a 5.2 Magnum. Has anyone run these throttle body hats on a carburetor? I've seen it done plenty of times in the reverse (carb air cleaner assembly on Magnum throttle body). I know fuel distribution can be an issue due to air turbulence...

I would change the squirter, two to three sizes larger (try a 35). That will clear the initial hesitation or lean spike. If the carburetor is tuned well, other than the initial hit, why make any other changes? Takes all of five minutes.

This is exactly what to do in order to solve vapor lock. Even on my 470" low-deck, the fuel would start boiling, not in the bowls, but from the (new) mechanical fuel pump. That short time period in the fuel pump, caused vapor lock issues. I now run a carburetor heat shield, and a vapor return...

My 470" ran great cruising at 11.8-12:1 and achieved reasonable economy while doing it, which most owners would never realize unless they killed the ignition and coasted off the highway to read plugs. Initially, the Holley Ultra XP was so fat OOTB, it was running 10.5:1 AFR while at cruise...

Fuel system cleaner. Should be fine. Would go ahead and order a spare.

Holley has this in their tuning guide. If you drill out the primary throttle plates, start small, 3/32" drill bit. We've done this with all of our carburetors, actually, one had both the primary & secondary throttle plates drilled. The Ultra XP series has an idle bypass circuit that's...

Yes, but be prepared to not like what you see. It's one of the most beneficial, yet frustrating tuning tools on a performance application. Just to give you an example, my 470" low-deck is currently running 11:8-12:1 AFR on the highway, which is incredibly rich, but you would never know it by...

You're going to have to step into the big boy fuel systems ("big money"), not like you aren't already accustomed to that with a Procharged HEMI. You'll need at least a 1/2" fuel line for the feed. Return line is typically larger on FI applications to reduce strain on the fuel pump. I would...

Well look at it this way, it can't hurt to swap the 02-sensor. If that's not the problem, you'll have a spare. RMCHRGR spoke a bit on this yesterday, how he can't really understand why 02-sensors fail. To be completely honest, I find it hard to believe as well, although it's happened three or...

I'm pretty sure you're looking at my file, or at least, a copy of it from a few years ago. Created a document which included all the spare parts (non-Holley, OEM) on the Holley Sniper EFI Owners Group on FB before I was banned (by Facebook). My system inevitably had an ECU failure in under...

Not hard at all to kill an 02-sensor on a non-OEM application. https://www.nzefi.com/bosch-lsu-wide-band-airfuel-ratio-lambda-sensors-fail-often-aftermarket-performance-applications/ I've killed MANY, enough where I essentially have a spare in the garage. Didn't notice a difference from...

Just finished dealing with this last year on our daily driven, 77' W200 we restored. STEP (1): add a fuel filter with a vapor return line. WIX Filters P/N: 33040 (5/16" inlet - outlet & 1/4" return) WIX Filters P/N: 33041 (3/8" inlet - outlet & 1/4" return) When using these fuel filters, you...

Holley forums are great. As I mentioned before, I created a word document that listed all the user serviceable parts with standard OEM part numbers and a Holley Representative also assisted with the vehicle year / model info (where you could purchase these locally, and not from Holley) for the...

Yes they do, but most people are on the FB Group.