crank mods help
Elder User
Joined: Jan 2004
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From: Eastern Pa
The 400 crank is fine the way it is. The only things are to make sure the oil passages have a nice smooth chamfer. If you wanted to help the bottom end you could get the whole rotating assy balanced, but tou will have to either have the flywheel/flexplate and damper done with it or get a nuetral balance flywheen and damper. Around here a NAPA reground cost me $193 including clevite bearings plus a $40 core charge.
Last edited by tastyklair; Oct 23, 2004 at 10:16 AM.
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From: chicago burbs
Elder User
Joined: Jan 2004
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From: Eastern Pa
The 400 is an externally balanced engine, in other words brought into balance using weight on the balancer. If you balance the rotating assy, which is the best way, you whould ask the shop that does it if they can do it with the flexplate and balancer you have or if you should get a nuetral flexplate and balancer. The shop may be able to make yours neutral.
Lead Driver
Joined: Mar 2004
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The only way to make a 351C/ 351M/ 400 internaly balanced is plugging the crank with mallory. Then your stuck with trying to find a flywheel & dampner that weren't offered from the factory that way. My 2c
Last edited by mark a.; Oct 24, 2004 at 12:14 AM.
Hotshot
Joined: Dec 2003
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From: iowa
only suggestion on balancing, it's a little more expensive but when they balance the engine use the factory type balancer, and flexplate/flywheel with the 28oz balance but have any weight done with mallory metal that way if you ever tear up a flexplate you don't have to have the entire thing rebalanced like you would if you allow them weld wieght onto the flexplate
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Junior User
Joined: Aug 2004
Posts: 81
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From: Huntsville, AL
i don't know anything about mallory. but i know that summit offers an flexplate and harmonic balancer that are both neutral balanced. so if get those then i would have to take my crank, rods, and pistons to a shop to have them balanced. then the engine would be internally balanced and internally balanced engines are better for preformance applications. have i got this right?
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Hotshot
Joined: Dec 2003
Posts: 18,423
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From: iowa
Mallory metal is a heavy metal that is used to balance cranks, it is 4 times heavier than iron if I remember correctly, so if they need to add weight to the counter weights on the crank they drill a hole, and press in a plug of mallory metal which weighs more than the iron they drilled out (Mallory metal is the same stuff that they make armour plating out of ), you can buy a nuetral balance flexplate, and balancer, but you better figure on tripling the cost of the balance job as they have to add enough heavy metal to the crank to make up the difference, ant that stuff is very expensive, 1 piece used in my crank about 3/4" dia and the length about 1" cost $60, the best is to use the external balance flexplate, and balancer, but have any additional balance weight added to the crank with heavy metal, and unless you are planning on turning this engine 8500rpm external is just fine, and even some of the nascar engines turning in the 9s are external balanced.
BTW to have the wieght welded on the flexplate it would have cost me $150, I had it done with mallory metal to the crank cost $250, if I wanted the engine changed to internal balance would have cost over $800
BTW to have the wieght welded on the flexplate it would have cost me $150, I had it done with mallory metal to the crank cost $250, if I wanted the engine changed to internal balance would have cost over $800
Junior User
Joined: Apr 2004
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From: L O U I S I A N A
Bored 30 over, 240 Inline 6 connecting rods and crank has to be offset gound to accept them, ACL-9356 pistons which have a CH of 1.405" (I think). Should come out to 426 C.I. So I have been told.