Hello, I have a 460 crate engine (87 460 donor motor for parts). I am converting this to an auto (c6) tranny. Does anyone know if this was internal balance or external? LOL hard to get a flexplate without knowing! Thanks, Jay

 

It is an externally balanced engine. The easiest way to tell is to look behind the harmonic balancer on the front of the crankshaft. If it is externally balanced, there will be a hatchet shaped weight between the harmonic balancer and the timing cover.

I put an '86 460 and C-6 into my '66 F-100, and am very happy with it.

 

Thanks.... I love that old truck! Jay

 

I know this is a newbie question, but will I align the weighted end of the flexplate to the same position as the hatchet shaped wedge on the front ? Jay

 

If I remember right, no, you don't have to figure out how the flexplate mounts with respect to the front counterweight. The flexplate bolt holes are keyed, so that it only goes on one way. The flexplate has its counterweight already welded into the correct position.

By the way, this is the best forum to ask questions how the 460 will fit in your truck, and how to make it and the transmission linkage work etc.

As for specific 460 questions, if you don't get an answer here, try it in the 385 Family forum, dedicated to the 370, 429 and 460 engines. They really know their 385 stuff there, but don't know as much about our Slicks.

If it turns out that the flexplate can go on more than one way, then ask again in the 385 forum; they'll give you a more definitive answer.

 

Here is the mechanical setup of my truck; I did this a summer ago.
I am getting 15 MPG at 70 MPH with a nearly stock 460 in my '66 F-100. And I have power to spare.
‘86 460 bored 60 over with stock '86 heads - no porting
'77 F-250 460 engine perches and mounts
'69 straight up cam gears, Cloyes double roller with RV type cam
Edelbrock Performer (not RPM) intake and 1470 750 CFM carb on a 1" phenolic spacer
'76 Duraspark II ignition
Stock aftermarket manifolds with a 2 1/2 inch dual exhaust (plain mufflers); copper gaskets
'93 serpentine belt brackets and pulleys
'78 power steering pump, hoses
with ’93 PS serpentine pulley
'76 power steering box
’76 power steering pitman arm
’92 power steering cooler, mounted in the frame
'70 steering column
'66 radiator (re-cored)
'66 alternator
with '93 serpentine pulley and fan
'86 water pump
'86 fan clutch with '77 7-blade fan
'83 C-6 from an '83 F-350 fifth wheeler, with '77 C-6 linkage (internal shift rod and kickdown)
2.75 rear end
'83 stock rear sump oil pan, with stock oil pump, pickup tube and dipstick (includes main bearing bolt with stud to hold pickup in place)
Includes '93 A/C compressor, but A/C is not installed. (Needed for the serpentine belts.)
’76 F-150 3-inch rear brakes

The only modifications I had to make were:
Fabricate an accelerator cable bracket by combining an FE one with a 385 one.
Shorten the front driveshaft to adapt to the C-6 (with a conversion joint)

 

Thank you again! This is such a time saver having you guys that know so much. I was totally in the dark before I found this board! Jay