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#25 Venturi

Chad S I am taking your advice and using 1 qt of E 85 and 3 gts of 93 Octane gas in my H. I am wondering which venturi do you think would work best for me. Here is how we are set up 3 9/16ths firecater pistons, 300 head, 300 LP manifold, cam grind & a M carb you had told me a 23 or a 25 would work. We are always short of low end power. Which one do you think. Will take one or the other, how much $
 
bigger is for more rpm and more horsepower. smaller is for less rpm , more low end , when the sled gets to the 250 line what rpm will you be turning. then go to the venturi to match that rpm. rent a sled and try them both. low end needs more velocity .
 
The 23 will be the best all around. Even if it reves way up, it will still lug its way down to lower rpms, so best to be conservative and start small. Where are you running on the hitch specs???? For what you have, it should pull very strong with a clevis bolted to the horseshoe drawbar, in the 3500-4500lb, "farm stock type low gear 3mph or less type of pulling" Even if the rules say you can run em closer and higher, if you dont have alot of power to handle the chassis adjustments, you simply back off the adjustments till it starts pulling a little more, and stalling a little less. You wont stall a 45 hp H pulling off the horseshoe part of the hitch and a clevis set at 17-18 inches high, even with 15.5, it will spin if its 45 hp. Hope this helps. But go with a 23,,,, Super H thru 300 was famous for the 23. Chad
 
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