We just got finished dyno testing a 337 cu in Y-Block for a 1955 Crown Vic. Aluminum heads and High Rise intake were out of box units. Cam is one we designed with Isky for some crate engines we would like to do. 228 degrees @ .050" with .490" lift after lash with 111 degree lobe separation.
We tried 2 carbs, a highly modified 650DP, modified to 700CFM with choke horn removed and down leg booster venturi's. Next we tried one of the new Summit "Autolite" style 600CFM vacuum secondary carbs. Power was identical. The only problem we had with the Summit carb was the fancy chrome fuel line leaked and couldn't be used. Summit supplies a 1/4" thick insulating gasket with open plenum and we used that as a spacer.
We only made 5 pulls since the engine did more than expected on the 1st pull. Timing was set at 33 degrees, no jet changes. Headers are a cobbled up set I made out of some 351 Cleveland headers, 1-5/8 to 1-3/4", runners are 34-40". Rockers are stock 1.54:1. An MSD distributor and new billet steel damper were also used on this engine.
Peak torque was 420 @ 4100, peak HP 392.7 @ 5400. Tests were stopped at 5500 rpm.
http://ford-y-block.com 20 miles east of San Diego, 20 miles north of Mexico
