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#1
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does a 400 crank with a 2.50 pilot for flex plate need a external balanced flex plate
When I bought my engine it was a 72 block and a crank out of a newer 400 with the small hub on the back. I am chasing a noise and the question came up does this need a weighted flex plate or not.
Can someone shed some light on that. I put a standard harmonic balancer on it. Thanks Greg |
#2
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As far as I know the answer is no, the only externally balanced Pontiac V8's we the 301 & 265's of 1977-1981 vintage.
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Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
#3
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The factory flex plates are external balance -missing one hole. I would assume the factory cast iron flywheels also are. Depends on if the machine shop who built it balanced it for a neutral balance flywheel.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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