Bad 502 pump gas Piece by Mesa
#1
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Guys we've been busier than a one armed paper hanger around the shop but here is a project you guys will enjoy one of our friends and fellow racers contacted us about taking his new 502 and doing what ever we could to make the most power on pump gas we felt confortable with. I started by saying I would dyno the existing engine to start and I felt we could make around 640 hp on pump gas. The dyno started at 540 hp we took the engine completely apart decked teh block to get the piston to head we wanted balanced the assembly reconded the rods with arp bolts . I had Cam Motion grind me a solid roller with tight lash profile for the heads we were using which Brodix supplied for us . We had the heads cnc ported with some changes from our original MB850na head installed a Brodix intake with an 8082 holley which we tuned here. We started the engine and made the first pull the power was way off we started looking and the distributor hold down clamp had colapsed and the dist. moved set the timing and after it was done we had made 698 hp and over 600ft lbs everywhere I call the customer and told him were we were and I was going to come in on Sat. and finish it up when I was done I made 738 hp and the torque curve was flat as a board. The boats speed is up and the customer happy. Pump gas under 11.00:1 comp. Sincerely Laz
P.S. this is the most power I've been able to make with a 502 Std bore.
P.S. this is the most power I've been able to make with a 502 Std bore.
#6
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Originally Posted by 42MTI
Which heads did you run Laz, and were they cnc'd by the factory or a private shop.