SEEKING WISDOM 429/460
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Joined: Feb 2011
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SEEKING WISDOM 429/460
OK GUYS, I HAVE A 92 F700 WITH A BLOWN 429 MOTOR. I ALSO HAVE A 79 F250 CREW CAB 4X4 WITH A 460. WONDERING IF THE 460 WILL WORK IN PLACE OF THE 429. WILL ALL ACCESSORY MOUNTING BOLTS BE THE SAME? ALSO THE F700 HAS 2 PUMPS, 1 FOR STEERING, 1 FOR BRAKES. DO YOU THINK THE CRANK PULLEYS WILL INTERCHANGE? THINKING THE 429 HAS A DIFFERENT SNOUT. BUT NEED THE EXTRA BELT GROOVE I THINK. HELP ANY IDEAS??
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
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From: Axtell, TX
Not an expert on the 385 series but 79 and later 460's were externally balanced and all 429's were internally balanced. So you'd need the correct flywheel and front spacer for the 460. I think all the harmonic balancer's are the same, zero balanced, and should fit either.
Posting Guru
Joined: Mar 2010
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I'm no expert either...but that 429 is an industrial 429, and I thought I read somewhere around here that on the whole, the only commonality between the passenger engines and the industrial engines were displacement. Don't quote me on that, but there is definitely a difference.
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
391FT has a steel crank with a larger diameter snout, poor heads and entire upper end for that matter. Good for tq I guess. I doubt if it would rev over 4k though lol. The 391 service blocks were used for 428's I believe as well. Meaning they have thicker cylinder walls. They are also externally balanced, where the 390FE is internally balanced.
Didn't know about the industrial 429. Hopefully more will chime in.
Didn't know about the industrial 429. Hopefully more will chime in.
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
the distributor hole is a little larger to fit the 5/16" oil pump driveshaft. The other main difference is probly the exhaust crossover setup in the intake/heads/exhaust.
The mind is prone to slips.. one day it will fall and I'll probably forget who I am. lol
The mind is prone to slips.. one day it will fall and I'll probably forget who I am. lol
