Try to build up a 302 for my 59 ford, looking to get a shorty pump and pulleys and I thought early 302s had 3 bolts in the front yet this one has a four bolt pully up front. The numbers on the block C80E-6015A is telling me its an early engine. I'm guessing sometime in its life it's been rebuilt and someone put a four bolt crank in it? Is this possible and do you think it'll cause any problems down the road. Also it looks like it has 351 windsor heads on it could that be the reason for the four bolt crank? I'm I starting out with a frankenford?
That number was used in 68-69. The 4 bolt balancers started around 1970. Check the number on the balancer to verify its vintage. Your parts are probably correct for each other. The 302 balancers, with a different weight, started in early 80's. And, it's easier to find the 4 bolt pulleys. All numbers and years are approximate, from my mind's archives(hah).
There's also different lengths of balancers just to make things even more muddled. The three bolt dampers actually carried on long after 1970 in some applications other than cars so there is much more confusion available. But since you are putting on a shorty water pump you were doomed to have pulley misery from the start.
Yep, 1970 was the change year to the four-bolt pulley on cars/trucks. You can swap dampers around on all windsor cranks as long as you keep the balance factor right. Ford did move the timing marks around however, make sure you check for TDC, you may have to fab up a timing pointer or use a timing tape. Three-bolt dampers were used into the '90s on some marine versions if you're desperate for one, even one with the 50oz imbalance, although it'll need some minor machine work to use the car pulley. You can buy aftermarket dampers with both patterns also.
Here's a few of the variants: C5AE (289), D3UE (Econoline?), C9TE (truck), D5AE (I think): I also noticed a 351M piece in the stash, which looks like it would fit as well, so that's another possibility when searching for a damper. As would 400 and 300-6, but the 6 being 0 balanced.
Ok what decides the weight balance? With the four bolt crank should I use a 28oz flex since its a early block or a 50 oz? Do I need to check the damper and match the plate to that? I'm assuming that's what I should do only I'd figure I'd ask the pros first. So if I were to get a flex plate and matching damper either one, 28 or 50 and bolt it up would that work?
The 3 bolt damper is used with a passenger side inlet water pump, the 4 bolt with a driver side inlet pump. The timing pointer changes locations, opposite the pump inlet, therefore the timing marks on the damper are different. The inlet change was 1970 for cars. Vans, Bronco and others kept the older style. The change from 28 oz-in to 50 oz-in balance factor was on the '82 5.0, need an aftermarket damper to get a 3 bolt in 50 oz-in.
The crankshaft. There is a designation on a counterweight. 1M, 1MA = 289 (28 oz-in) 2M, 2MA = 302 (28 oz-in) 2MAE = 5.0 (50 oz-in) The flyweights are smaller to reduce overall weight. This needs more external balance factor. 3M, 3MA is 351W, 4M, 4MA is 351C, and 5M is 400, but they have different main diameters and won't fit a 302/5.0 block. All 28 oz-in balance.
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