07-23-2007, 09:10 AM
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CC Member
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Join Date: Apr 2000
Location: Gainesville, Fl USA,
Posts: 298
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Not Ranked
Bending pushrods on 351C …
Greetings from sunny Florida  . We’re having a problem with our engine that we can’t figure out. We’ve got a mild 351C with a flat-tappet hydraulic lifter cam and stock rocker arms. When trying to tune the first carb (700 cfm 4150), the engine backfired and bent a few pushrods, which seemed quite odd. We replaced the damaged pushrods, buttoned it back up with new plugs and a fresh 4150 from Jesse at BIGS Performance and the engine ran like a clock. We just put the car on the road this weekend and drove it 100 miles on Saturday with no problems. On Sunday we tried to start it, the engine backfired a few times so we cleaned the plugs and tried again. When we tried to restart the engine, it had a big miss and when we revved it to around 1500 rpm, we could hear an audible tapping noise coming from the valve covers. Next, we pulled the valve covers and found 5 more bent pushrods. Have you ever experienced a backfire that resulted in bent pushrods? We’re very puzzled. Thanks for any insight you can offer!
Mike
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