| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
10-09-2020, 01:09 PM
|
||||
|
||||
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
10-09-2020, 02:24 PM
|
||||
|
||||
|
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.
__________________
Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 1971 Fiat 130 Coupe 3.2L SOHC V6, ZF 5-speed 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 05 Dodge Magnum 3.5L SOHC V6 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
10-09-2020, 03:24 PM
|
||||
|
||||
|
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.
__________________
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 [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
