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Post by gtajunkie on Nov 24, 2014 17:11:31 GMT -6
I HAVE A 509 BLOCK WORLD SPORTSMAN 2 HEADS [200 CC RUNNER 64CC] .585/.585 SMALL BASE MECH ROLLER CAM TRYING TO DESIDE BETWEEN A 421 OR A 406. IT WILL GET BOLTED TO A FALCON RACING TRANNY. MY HOME TRACK IS A 3/8 MILE ANY ADVISE OR SUGGESTION WOULD BE A GREAT HELP !!!
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Post by flipflopoo1oo on Nov 24, 2014 20:53:46 GMT -6
I would go bigger and not turn it up too much! What kind of fuel? I don't run any more compression than I have to for longer burn time on the longer strokes for sure! A lot less timing needed with so much dwell timing on the pistons, plenty of time for pressure to build on its own! A lot of prep and parts to gather up too! We usually go cheap and de-stroke to turn that baby up on a 1/4 mile! Is your cam a single pattern asymmetric cam? You will need all the specs on it to degree! If it ran in a 350, opt for newer design to fit stroke!!!
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Post by gtajunkie on Nov 24, 2014 21:20:41 GMT -6
That cam was in a 396 and has about 2 hrs of run time on it I got the cam card at the shop. Still not very happy with the machine shop that long blocked that motor. Cam timing was 20 degrees off and it through a rod out the side of the oil pan. Lost the block, crank, 2 rods and a piston and that's before I tear it the rest of the way down.
But the fuel I'm going to use is VP M-85 85% methanol 15% VP 110
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Post by flipflopoo1oo on Nov 24, 2014 21:37:03 GMT -6
It would probably be asymmetric as they degree in only by the on ramp of the intake and not by centerlines! Best to check any at the valves! The back side of the lobes are a straighter shot to close faster! Better spring retainers and keepers are a must along with perfect spring pressures and valves!
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Post by billy5x on Nov 28, 2014 2:05:48 GMT -6
stay on top or setup or a 305 will beat you
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Post by gtajunkie on Dec 8, 2014 6:18:21 GMT -6
My car is still in the build process but have 4 corner weight jacks , fine thread bolts on front & being it is a G-body I have adjustable upper links from sphon performance and gonna get the adjustable lowers as well
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