Belt Length for 351w with U/D pulleys, A/C, P/S

Italian LX · 02-05-2007, 02:45 PM

On my 351w block with A/C, power steering and underdrive pulleys (bypassed smog pump), an 86" belt fit perfectly within range.

Note: The accessory configurations are as on an 87-93 Mustang.

(As with any belt size recommendation, the length can vary because of different size underdrive pulleys, but this should get you close.)

coupe · 02-05-2007, 03:12 PM

Which way was it routed?
Does the belt go down from the alternator straight to the crank-pulley? Or the other way: belt goes from the alternator down to the top of the water-pump pulley and nearly touches itself by the tensioner (not recommended).

Italian LX · 02-05-2007, 03:21 PM

Quote:

Originally Posted by coupe

Which way was it routed?
Does the belt go down from the alternator straight to the crank-pulley?

It's routed the correct way from alternator to crank (water pump wrap is opposite from stock).

Quote:

Originally Posted by coupe

. . . Or the other way: belt goes from the alternator down to the top of the water-pump pulley and nearly touches itself by the tensioner (not recommended).

I've heard of belts shreding due to running the belt that way. I never run mine like that.

QWKSNKE · 02-05-2007, 03:26 PM

On a stock 5.0 pulley setup with smog delete it is 83-84" with the belt configuration Brian mentioned

93 cobras are shorter but I am unsure at this point the exact size. I bought an 83" belt and it was to long

02-05-2007, 02:45 PM	#1
Italian LX Daddy x4 ...we're done Join Date: Dec 2004 Location: Oxford, AL Posts: 11,549	Belt Length for 351w with U/D pulleys, A/C, P/S On my 351w block with A/C, power steering and underdrive pulleys (bypassed smog pump), an 86" belt fit perfectly within range. Note: The accessory configurations are as on an 87-93 Mustang. (As with any belt size recommendation, the length can vary because of different size underdrive pulleys, but this should get you close.) __________________ -Brian '86 Mustang GT Convertible '88 Mustang LX coupe '11 Odyssey TE '21 Insight Touring Last edited by Italian LX; 02-05-2007 at 02:48 PM.

02-05-2007, 03:12 PM	#2
coupe Super Moderator Join Date: Dec 2004 Posts: 6,313	Which way was it routed? Does the belt go down from the alternator straight to the crank-pulley? Or the other way: belt goes from the alternator down to the top of the water-pump pulley and nearly touches itself by the tensioner (not recommended). __________________ " If you can't explain it simply, you don't understand it well enough. " - Albert Einstein

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02-05-2007, 03:26 PM	#4
QWKSNKE 3v's are slow Join Date: Dec 2004 Location: Here and There Posts: 17,152	On a stock 5.0 pulley setup with smog delete it is 83-84" with the belt configuration Brian mentioned 93 cobras are shorter but I am unsure at this point the exact size. I bought an 83" belt and it was to long