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post #1 of 10 (permalink) Old 12-25-06, 04:26 PM Thread Starter
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Internal or external balance?

I bought a rebuilt but not assembled 460 engine off of a popular auction site. Being new to 460 engines, how to I tell if it is an internal or externally balanced engine? I don't know the castings numbers yet as I haven't received the engine, and I don't know if that's how you can tell, although I'm assuming that. I'll need to get a flywheel and I want to be sure to get the right one. Thank you in advance.

Ron

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post #2 of 10 (permalink) Old 12-25-06, 07:13 PM
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cool Re: Internal or external balance?

  • 1979 & later 460's were externally balanced, while the 1978 & earlier were internally balanced.
  • Loo for numbers that are stamped on the edge of one of the crank's counterweights: 460 internal balance crank numbers are 2Y, 2YA, 2YAB & 2YABC; 460 external balance crank numbers are 3Y, 3YA, or may have none of these markings
  • Between the harmonic balancer and the timing cover, a spacer rides on the crankshaft snout. On the internal balance engine, this is nothing more than a sleeve/spacer, while on the external balance engine it is the external balance/hatchet weight.
  • 1979 & later 460 external balance flex plates have a weight on the perimiter, while the 1978 & earlier do not.
  • OEM internal balance engines will have a cylinder block casting number of D9TE-AB, but beware that an external balance rotating assembly may still be placed into the earlier blocks without any modifications.

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post #3 of 10 (permalink) Old 12-27-06, 05:40 PM Thread Starter
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Re: Internal or external balance?

Thanks, Paul
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post #4 of 10 (permalink) Old 12-28-06, 04:47 AM
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Re: Internal or external balance?

Hello Ron, When I purchased my Rebuilt 460ci engine I was told it was a internal balanced 460ci, D9TE-AB Block so i went and purchased a flywheel and front spacer to match, when my mechanic took the car for a drive the engine had a bad vibration, I phoned the Importer who I purchased the 460ci gave him the block casting numbers he told me it was a EXTERNAL balanced 460ci so I had to find a Flywheel with the counterweight and Front spacer with counterweight, I pulled the Toploader out myself to change the Flywheel, it would be best to find out what you have first before you put it in your car as it can be costly and back-breaking work ... Cheers Jamie. Australia.
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post #5 of 10 (permalink) Old 01-05-07, 06:32 AM
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Re: Internal or external balance?

On this same subject, where all 429 internally balanced, or did they switch to external balance on them at some point too?

1970 LTD 2dr. HT 429 4bbl
1988 F-150 4x4 short bed 5-speed
1989 F-350 4x4 regular cab SRW with 7.5 and 5-speed
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post #6 of 10 (permalink) Old 01-05-07, 11:18 AM
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cool Re: Internal or external balance?

Quote:
Originally Posted by Brian Stone
On this same subject, where all 429 internally balanced, or did they switch to external balance on them at some point too?
The 1968-1973 production run of 429's were all internal balance engines.

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post #7 of 10 (permalink) Old 04-13-09, 04:26 PM
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Re: Internal or external balance?

So. The engine in my Galaxie is a 68 429, with a 3 bolt belt pullyon the 429 damper.
Can I install a 460 damper, that has a 4 bolt pully on to the existing 68 429 crank?
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post #8 of 10 (permalink) Old 04-13-09, 06:31 PM
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cool Re: Internal or external balance?

Quote:
Originally Posted by mcoo22 View Post
So. The engine in my Galaxie is a 68 429, with a 3 bolt belt pulley on the 429 damper.
Can I install a 460 damper, that has a 4 bolt pully on to the existing 68 429 crank?
Yes, all 429/460 harmonic balancers are zero balanced.

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post #9 of 10 (permalink) Old 04-19-09, 07:59 AM
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Re: Internal or external balance?

Thanks to everyone. This thread has been most helpful. I will go through this problem again, though. Be patient with me if you can. I don't want to tear this endine all down again thinking that this will work, ony to find out it will not. My engine that is in the car is a 68 429. It has a harmonic balancer that has a pulley that bolts on to it with three bolts. I have a complete bracket/pulley set upo and ac/pwr steering set up that is off a 79 460. This set up has a little beefier balancer that has a puuley that attaches to it with 4 bolts. If I can adapt this 460 set up to my 429, it will solve all of my AC problems, ect. Will the 460 damper/pulley set up bolt on to my 429 crank and work without affecting the balance of the engine? Sorry, just making sure.
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post #10 of 10 (permalink) Old 04-20-09, 06:35 PM
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cool Re: Internal or external balance?

Quote:
Originally Posted by mcoo22 View Post
My engine that is in the car is a 68 429. It has a harmonic balancer that has a pulley that bolts on to it with three bolts. I have a complete bracket/pulley set upo and ac/pwr steering set up that is off a 79 460. This set up has a little beefier balancer that has a puuley that attaches to it with 4 bolts. Will the 460 damper/pulley set up bolt on to my 429 crank and work without affecting the balance of the engine? Sorry, just making sure.
Yes, all 429/460 harmonic balancers are zero balanced.

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