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Post by dirtracer07x on Nov 21, 2014 0:35:00 GMT -6
OK so a local track is doing there own Bmod rules. USRA suspension 3link. But motor can have vortec heads, any intake, 750 carb, solid cam max lift 480 and alcohol or race gas. Or a 602 crate. Here's my question. Already had bottom end done with hyper flat tops and 535 lift cam set up for eq imca sport mod heads and a 2 barrel. Do I pull big cam and eq heads and change them to vortec and small cam or just run what I have with a 4barrel?
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Post by flipflopoo1oo on Nov 21, 2014 8:40:25 GMT -6
We were very surprised at what was accomplished with only 437 lift, however with geometry involved that lessened lift only by .013 we gained more torque to use our 750 q-jet to win over 80 percent of the next 3 years of racing! The engine turned 6400-6900 depending on the track in several states! Never had to cheat any rules as we were checked a lot winning so much in limited mods! I would have to go by the rules on the cam! Not small on duration or timing and quickness of geometry ! You have to realize the flow starts at .020 or .050 depending on the valve size and the draw factors of vacuum! Nothing fancy ever seemed to do much good for us! Get the springs correct and do some home work on my other post to see all the horses being missed by others! If your money is tight and have no other recourse until winning, give it a go but never think less can't be more if done correctly as we have well proved the last 35 years in doing so! If you go planning on winning the first race, you better have it right for tech! We ran faster times than most modified that won all the time! You can get the best out of both low end and top-end with the geometry profiles matched to de-tune a high duration cam! We still had to pull 12 inches of vacuum at 1200 rpms in the process! Ask all you need, I hope to still be around a few more laps!!!
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Post by flipflopoo1oo on Nov 21, 2014 8:41:32 GMT -6
I found that getting rid of over-lap and reversion improved the torque the most in getting the valve timing correct!
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