Guys,I have been running 2-4s on pontiac since about late 1962.IMO they suck on the street with solid linkage.I dont care if they are 600s or 750s.Im running a set of 421 SD clones on a converted 421 SD "859" intake on my 421 GP right now and a pair of 750 421 SD NASCAR carbs on my 421 with a bathtub intake.I have a 428 RA V engine going on the pump this friday and hope to run a pair of 421 SD 750s on a 2-4 tunnel ram.I will run them solid on the dyno also when the car is raced its switched to solid.The engines have NO issue running off the front 2bbl of the rear carb.FWIW,Tom
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