trying to put a 460 in a 79 with a 4 speed

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trying to put a 460 in a 79 with a 4 speed

Post  Fordman79 on September 25th 2014, 4:48 pm

I've got a 79 ford that I wanna put a 460 in. the trucks a 4 speed though, and I'm having troubles finding a manual flywheel for the 460. someone told me that ford didn't start putting the 460 in front of a manual untill 1983, and that when they did it they rebalanced the crank, so therefore the flywheels will not interchange correctly. so what do I need to do to get this 460 into my truck? will a flywheel from a 390 or a 427 work?

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Re: trying to put a 460 in a 79 with a 4 speed

Post  J.Toney on September 25th 2014, 5:03 pm

http://www.landlproducts.com/details.aspx?cID=7&BP=0&scID=0&ItemID=1042
There's probably other more cost effective options, but here's something.
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Re: trying to put a 460 in a 79 with a 4 speed

Post  whitefield on September 25th 2014, 6:10 pm

Fordman79 wrote:I've got a 79 ford that I wanna put a 460 in. the trucks a 4 speed though, and I'm having troubles finding a manual flywheel for the 460. someone told me that ford didn't start putting the 460 in front of a manual untill 1983, and that when they did it they rebalanced the crank, so therefore the flywheels will not interchange correctly. so what do I need to do to get this 460 into my truck? will a flywheel from a 390 or a 427 work?


390 flywheel will work .
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Re: trying to put a 460 in a 79 with a 4 speed

Post  glenevans on September 25th 2014, 6:38 pm

I believe the 390 flywheel is INTERNAL balanced, so it will work for 460s made thru 1978. That is what I put behind a 1974 460 in my '78 F-250 many years ago. Then we used 390 motor mounts (rubber insulators) that we cut the corners off, to work on the 460 with stock exhaust manifolds. Also had to notch the frame a bit with a torch on one side, then used the 400 bellhousing that came with the truck.

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Re: trying to put a 460 in a 79 with a 4 speed

Post  res0rli9 on September 25th 2014, 7:49 pm

390 flywheel will work, that's what I used in my 74 250 4x4 back in the day.

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Re: trying to put a 460 in a 79 with a 4 speed

Post  Fordman79 on September 26th 2014, 10:40 pm

sweet, thanks guys

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Re: trying to put a 460 in a 79 with a 4 speed

Post  J.Toney on September 27th 2014, 5:55 pm

Never knew that one, spiffy!
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Re: trying to put a 460 in a 79 with a 4 speed

Post  7LBRONCO on September 28th 2014, 9:09 pm

You will need to use a 5.0 bushing, in the back of the crank flange, to gain the 1/2" clearance lost by using the "M" bellhousing. I have done a few of these, and the power difference is amazing!

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Re: trying to put a 460 in a 79 with a 4 speed

Post  IDT-572 on September 29th 2014, 11:03 am

7LBRONCO wrote:You will need to use a 5.0 bushing, in the back of the crank flange, to gain the 1/2" clearance lost by using the "M" bellhousing.  I have done a few of these, and the power difference is amazing!

Or cut the 390 bushing down in a lathe if you have one.
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Re: trying to put a 460 in a 79 with a 4 speed

Post  Fordman79 on September 29th 2014, 11:25 pm

7LBRONCO wrote:You will need to use a 5.0 bushing, in the back of the crank flange, to gain the 1/2" clearance lost by using the "M" bellhousing.  I have done a few of these, and the power difference is amazing!

are you talking about the pilot bushing in the back of the crank? and a 5.0 liter one will make everything fit right?

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Re: trying to put a 460 in a 79 with a 4 speed

Post  7LBRONCO on September 29th 2014, 11:50 pm

Fordman79 wrote:
7LBRONCO wrote:You will need to use a 5.0 bushing, in the back of the crank flange, to gain the 1/2" clearance lost by using the "M" bellhousing.  I have done a few of these, and the power difference is amazing!

are you talking about the pilot bushing in the back of the crank? and a 5.0 liter one will make everything fit right?

Correct. The 460 crank flange protrudes about 1/2" further from the back of the block, than the 351m, so using the shallower M bellhousing causes the tranny input shaft to bottom out on the pilot bushing before the tranny is tight to the bellhousing. Most 460 crank flanges are double bored. The smaller bore, which is further in the flange, is where the 5.0 bushing goes, and allows the input to go in far enough to bolt the tranny up tight to the bellhousing.

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Re: trying to put a 460 in a 79 with a 4 speed

Post  Fordman79 on September 30th 2014, 12:58 am

7LBRONCO wrote:
Fordman79 wrote:
7LBRONCO wrote:You will need to use a 5.0 bushing, in the back of the crank flange, to gain the 1/2" clearance lost by using the "M" bellhousing.  I have done a few of these, and the power difference is amazing!

are you talking about the pilot bushing in the back of the crank? and a 5.0 liter one will make everything fit right?

Correct.  The 460 crank flange protrudes about 1/2" further from the back of the block, than the 351m, so using the shallower M bellhousing causes the tranny input shaft to bottom out on the pilot bushing before the tranny is tight to the bellhousing.  Most 460 crank flanges are double bored.  The smaller bore, which is further in the flange, is where the 5.0 bushing goes, and allows the input to go in far enough to bolt the tranny up tight to the bellhousing.


ok, makes sense, thanks. is there anything else? what starter would you use with a 4 speed tranny from a 351m?

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Re: trying to put a 460 in a 79 with a 4 speed

Post  7LBRONCO on September 30th 2014, 10:06 am

Use the same starter.

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