Quote:
Originally Posted by cobragene
FE 428 10:1 780 Holley vac sec open 3/4-7/8 with the lightest spring ,tall oval air cleaner, RPM performer, edelbrock heads, 36 total timing, hyd. Cam .539 280 ,at .050 230 lobe sep 110. 350 gears 29” x12” MT S/R tire, WR toploader. Runs great I just feel I am leaving some on the table, may try to get some Dyno and tune time. The tubes in side pipes are rather small, I guess that would be a good and cheap place to start? Any feed back would be much appreciated.
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I'm running a
similar mill, but slightly heavier on cubes and cam. I replaced my original Yokohama tires with MT S/Ts. If I stab the throttle more than an inch or two the tires break loose. If I give it WOT it literally scares the crap out of me, even after 16 years. I think the same ought to apply to your car as well, so I think something is not right. Now, that doesn't mean you have something big wrong, like a broken connecting rod, rather it means something small is not set right, because you say the car runs great. I think the solution is something really simple and easy and if I was standing over your car on a Saturday afternoon I bet I could find it pretty easily. With that in mind, the first thing I would check is that your progressive throttle linkage is opening all the way. Have someone get in the car while you stare at the linkage, have them push the throttle to floor and see how far the throttle linkage opens, then do it by hand and see if you can open the linkage farther by hand than they could by foot.