Harmonic balancer and flywheel help.
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Elder User
Joined: Nov 2004
Posts: 874
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From: Ashland, KY
79 302 help!
I've almost got my 79 ready for the road. But it soon will be down again here in 2 or 3 weeks. I'm pulling out my 79 302 for a built 69 302. But here is what I need to now. I believe 81 and back has a 28 oz. harmonic balancer on them and 82-95 has a 50 oz. on them. My motor is a 69 block but my crank is a 86 model crank. My crank has been turned but the guy told me to still get a 50 oz balancer for it. I was going to use the balancer off my 79 302 but I can't b/c of it being a 28 oz. What about the fly wheel, can I use it off my 79 302 or do I need a fly wheel off a 86 model motor. And are they marked someway to tell which is 28 oz. or 50 oz. I got a racing harmonic balancer for it that should work. BTW.. I got my title problem all taken care of and she'll be ready for the cruise inn's this April. My current 302 has about 150hp to 180hp I guess. My new 302 will have around 375hp to 400hp. It will be a great tire burnner for sure. Thanks for any help.
Scott B.
1979 F100 Custom
2wd, short wheelbase
Built 69-302. Auto
Built 302, Auto
Scott B.
1979 F100 Custom
2wd, short wheelbase
Built 69-302. Auto
Built 302, Auto
Postmaster
Joined: Mar 2008
Posts: 3,593
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From: Prairieville, La
I could be wrong, but I was always told to use the flywheel and harmonic from the same year crank. My dad had a '81 motor with an earlier flywheel. The vibration was constant and annoying. We put the correct flywheel in and fixed the problem.
Junior User
Joined: Sep 2008
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Yep, 81 switched to a one piece rear main seal so that block and crank arent goint to work together. 81 was also the year that they went from a 28.2 oz/in dampner to a 50 oz/in dampner. Lots of part interchange but you have to use the the correct year dampner and flywheel or your engine will be way out of balance
Cargo Master
Joined: May 2007
Posts: 2,071
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From: British Columbia
Engine balance
It doesn't matter the precise year of balancer you use, just make sure it is a 50 oz in. version; 1982 and up. This includes balancers made until the end of 5.0 production, not just those up till 1995.
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Junior User
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My concern with his post is that he siad he has a 69 block with a one piece rear main seal crank. Those two dont go together. And if he uses an 81+ harmonic balancer then he also needs to use an 81+ flywheel. I just dont think an 81+ flywheel and balancer are going to work in a 69 block
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Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
Good point Luckydoggy. Now I am curious if all 28.2 oz in. engines are two piece rear main seal and all 50 oz in. engines one piece, or if there are other combinations.
I have seen a posting with good pictures of the 28.2 oz in. vs. 50 oz in. balancers and flywheels, but can't find it now. Perhaps on carbdford.com. The 28.2 oz in. balancer has about a quarter or a third of its circumference in counterweight, the 50 oz in. version has the counterweight almost all the way around.
I have seen a posting with good pictures of the 28.2 oz in. vs. 50 oz in. balancers and flywheels, but can't find it now. Perhaps on carbdford.com. The 28.2 oz in. balancer has about a quarter or a third of its circumference in counterweight, the 50 oz in. version has the counterweight almost all the way around.
Cargo Master
Joined: May 2007
Posts: 2,071
Likes: 36
From: British Columbia
Engine balance
I found that post. It is in this forum after all. Let's see if I can copy and paste the pictures posted by Moderator TigerDan:
On the left is the earlier 28oz. imbalance flywheel, on the right the later 50oz.
28oz. (on left) vs. 50oz. (on right) dampeners
50.oz. (on left) vs. 28oz. (on right) flexplates
The original post from which these pictures are taken is at:
https://www.ford-trucks.com/forums/4...confusion.html
On the left is the earlier 28oz. imbalance flywheel, on the right the later 50oz.
28oz. (on left) vs. 50oz. (on right) dampeners
50.oz. (on left) vs. 28oz. (on right) flexplates
The original post from which these pictures are taken is at:
https://www.ford-trucks.com/forums/4...confusion.html
Thread Starter
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Elder User
Joined: Nov 2004
Posts: 874
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From: Ashland, KY
Glad you found th post. I seen this also and was looking for it. I do have the original 69 crank to so I'll use it and make things easy for me. I was going to use the 86 crank b/c it was ready to go, but you guys are right on the rear main seal. Thanks for the help on that, I had no idea they was like that. I have both 28oz. and 50oz. so that part I was fine on just wanted to make sure what to use on the crank. I love fords but why they done so many part changes is beyond me. I guess thats why ford motors are so much more to build than a cheby. Thanks for all the help and I'm sure I will need somemore b/c I haven't done a motor build in years. Thanks Again.
Scott B.
1979 F100 Custom
2wd, Short Wheelbase
302, Auto
Scott B.
1979 F100 Custom
2wd, Short Wheelbase
302, Auto
Junior User
Joined: Sep 2008
Posts: 65
Likes: 0
I would say a 50oz balancer and flexplate because the block is an 84, but different stroker kits come with different cranks. Some use all new forgings and some use stock offset ground cranks from a different appliction. Your best bet is to ask the manufacturer of stroker kit you are buying.
