valve train problems

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oteenc

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Some info for those that have the need for speed. My dart sport had a 400blk stroked to 511 ci all the good stuff B1 heads ported etc, roller with Harland Sharp rockers, etc developed 787 on the dyno fairly bumpy hp line in the upper range of the rpm. Broke the motor 4 times push rods bending breaking rocker arms and finally at Rockingham ran the 1/4 mile race at the mopar event bent 6 pushrods and broke 3 rockers blowed out the lifters took out the bearings with no oil pressure. I now have a light as well as a gauge.

Phase two: rebuilt the motor not a lot of damage new rings, bearings, bushed the lifter bores and installed new JESEL rockers, lifters, and tapered end push rods, and just dynoed the motor. With this minor change the motor has 827HP and was still making power at 7300 RPM on the dyno with everthing the same as the old motor. The HP curve and the torque curve were as smooth as could be, you would not believe the diference. The car ran this past weekend in the 5.40's with a 1.19 sixty foot time.
So FYI Jesel's make the differance. It was worth all the money. Just thought someone may need this info.
 
Thats great that you gained more HP. Now did you every figure out why you had the problem with the push rods. Were they to long, valves floating at a certain RPM, or rockers not lining up with valve right? Just thought I ask. I had a problem with one push rod that had to be shorten, it would bent after a few runs and cutting that rod a little, problem was gone. Sounds different but it worked.
 
The geometry was right as far as I could tell at the engine builders shop, but he kept telling me to go to the Jesel right from the start and I guess he was right. Most people reject the idea because of the cost but after tearing up all the other stuff, it was not that bad if it stays together. I went this weekend and ran 5.50's all weekend then broke out with a 5.495.
 
What was the cost of the Jesel rockers and are there more than one style/part number for the big blocks?
 
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