I’m installing an Edelbrock AVS2 carburetor on my 340-4 and I need to use a spacer because the throttle linkage is hitting the manifold. Any helpful suggestions?
If you have the original carb, getting it rebuilt by Quadrajet Power would be a better option. The avs is not jetted correct for Buick. Get an air fuel meter to get the fuel curve right. the one on left side is probably power brakes, one to the right would be transmission.
The Edelbrock carburetors are Carter 4bbl clones. Same bolt pattern as Holley 4150. https://www.speedwaymotors.com/Plas...MIzI6UkYrU6QIVC7LICh15ZAeREAQYAyABEgIpOvD_BwE https://www.jegs.com/i/JEGS/555/154...MIzI6UkYrU6QIVC7LICh15ZAeREAQYASABEgLZ-vD_BwE https://www.jegs.com/i/JEGS+Perform...MIzI6UkYrU6QIVC7LICh15ZAeREAQYAiABEgJQBfD_BwE https://www.ebay.com/i/190553431575...IzI6UkYrU6QIVC7LICh15ZAeREAQYBCABEgLV_PD_BwE#
Don't forget the heat risers, either use the metal plate or plug them. Other wise your spacer will melt! Tom Telesco (telriv) also builds a nice Carter AFB AVS. He did mine and its never run better.
Thank you for the advice regarding the heat riser and using plugs or a metal plate. My first time assembling a motor let alone a Buick motor so I need any and all advice I can get. Much appreciated, now time to get me a metal plate.
Good choice on the AVS2 carb. With the annular boosters it will work fine on your 340, Buick or not. If you have it already you will have noticed it is a dual bolt pattern which means it will bolt directly to your intake which has the close pattern associated with early Carters and even Q-Jets(w/o the spread bore of course). Get yourself a 4-hole 1/2" or 1" dual bolt pattern spacer. Whichever allows the throttle to clear the intake. Use the inner holes as the outer holes will not work with your intake. The wood spacer will insulate better while the 1" will add slightly more bottom end because of its' extra height. Either will work great. https://www.summitracing.com/parts/sum-g1411-2 https://www.summitracing.com/parts/edl-8723 For the best compromise on drive ability tap and block off the two holes in the intake under the carb. You'll be lucky to find the stainless metal plate for under the carb unless you have it and plugging the holes is the best thing to do anyway. Most of the original carbs got eaten up by exhaust leaks down there. Then you can use a regular gasket under the spacer. If the intake isn't bolted down permanently block off the heat passages coming up through the heads. If you are worried about cold weather driving drill a single 1/4" hole in one of the plugs you install on the passenger head. That is all you need for most circumstances unless you drive in lots of cold weather, <40*. If you can't/won't block off the exhaust x-over at the heads use (2)1/2" wooden spacers since there don't appear to be any reasonably priced wood or Phenolic 1" spacers.
