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6/25/2022 10:11 PM  #1


28 oz vs.50 oz balance help

So as you know my car has a 289 with a 5 speed and its 28 oz balance flywheel and just put it all new....My problem is I got a 302 explorer engine i wanna build  to put in. Will I be ale to use my28 oz flywheel by just changing the front balancer or should I just get a short  from my buddy that has the 28 oz 

Last edited by BILLY WALTON from GEORGIA (6/25/2022 10:14 PM)


Its really me....I fixed my caps lock .
 

6/26/2022 6:45 AM  #2


Re: 28 oz vs.50 oz balance help

Definitely not.  You need the correct 50oz blancer and flywheel.  A stock 5.0 flywheel would work.  That I actually do have, so let me know if you need it.

 

6/26/2022 1:30 PM  #3


Re: 28 oz vs.50 oz balance help

Ditto on TKO reply.  You need 50 ounce flywheel.

Also, most are set up for 10.5” clutch, and your 289 flywheel is probably drilled for 10” clutch, so a new clutch may be in order.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/26/2022 2:33 PM  #4


Re: 28 oz vs.50 oz balance help

i do not remember who's fly wheel i bought, it was a lightened unit, but not aluminum, it is 10. 5 wide and came with two weights, that you can bolt either one into, one being a 28 oz and the other 50 oz.

 

6/26/2022 5:45 PM  #5


Re: 28 oz vs.50 oz balance help

To give you a little good news, you should be able to use the hipo manifolds with the p heads...


If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
 

6/26/2022 5:49 PM  #6


Re: 28 oz vs.50 oz balance help

Are you gonna need any machine shop work?!
If so....just have the assembly balanced.
Additional 150 bux or so.


Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
 

6/26/2022 6:00 PM  #7


Re: 28 oz vs.50 oz balance help

My experience having 50 ounce to 28 ounce or vice-versa flywheel balance change done by machine shop has not been good.  I have wound up with drilled out mess that looked like it would blow up at 3,000 rpm. Worth the money to just get the right flywheel rather than taking chances.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/26/2022 7:04 PM  #8


Re: 28 oz vs.50 oz balance help

MS wrote:

Ditto on TKO reply. You need 50 ounce flywheel.

Also, most are set up for 10.5” clutch, and your 289 flywheel is probably drilled for 10” clutch, so a new clutch may be in order.

I think he built  me a  10.5 clutch I would have to see.
 


Its really me....I fixed my caps lock .
     Thread Starter
 

6/26/2022 7:13 PM  #9


Re: 28 oz vs.50 oz balance help

what about the harmonic balancer and the pulleys?


Its really me....I fixed my caps lock .
     Thread Starter
 

6/26/2022 9:05 PM  #10


Re: 28 oz vs.50 oz balance help

MS wrote:

Ditto on TKO reply. You need 50 ounce flywheel.

Also, most are set up for 10.5” clutch, and your 289 flywheel is probably drilled for 10” clutch, so a new clutch may be in order.

so what kind of problems am I gonna run into when putting my pullyes on front of my engine to run the factory A?C and power steering?
may not be worth the roller cam effort.

 

Last edited by BILLY WALTON from GEORGIA (6/26/2022 9:06 PM)


Its really me....I fixed my caps lock .
     Thread Starter
 

6/26/2022 9:17 PM  #11


Re: 28 oz vs.50 oz balance help

Use the Summit Racing balancer and appropriate aluminum pulley spacer for the 289 pulleys and it will all bolt up just like stock.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/26/2022 10:03 PM  #12


Re: 28 oz vs.50 oz balance help


Its really me....I fixed my caps lock .
     Thread Starter
 

6/27/2022 11:41 AM  #13


Re: 28 oz vs.50 oz balance help

Drilling a 10.5" flywheel for 10 clutch might be an option. Had to have that done for the FE. Flywheel was 11" and clutch was 11.5. The shop charged me less that $50 to do it. 


John  -- 67 Mustang Coupe 390 5 speed
 

6/27/2022 12:59 PM  #14


Re: 28 oz vs.50 oz balance help

Bolted to Floor wrote:

Drilling a 10.5" flywheel for 10 clutch might be an option. Had to have that done for the FE. Flywheel was 11" and clutch was 11.5. The shop charged me less that $50 to do it. 

I'm not a numbers guy...butt how do you get an 11-1/2 inch clutch to fit an 11 inch flywheel?


Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
 

6/27/2022 1:46 PM  #15


Re: 28 oz vs.50 oz balance help

Bearing Bob wrote:

Bolted to Floor wrote:

Drilling a 10.5" flywheel for 10 clutch might be an option. Had to have that done for the FE. Flywheel was 11" and clutch was 11.5. The shop charged me less that $50 to do it. 

I'm not a numbers guy...butt how do you get an 11-1/2 inch clutch to fit an 11 inch flywheel?

He's talking about the bolt pattern for the pressure plate.  It was drilled for an 11" clutch and he had it redrilled to accept an 11.5". 
 

 

6/27/2022 3:04 PM  #16


Re: 28 oz vs.50 oz balance help

TKOPerformance wrote:

Bearing Bob wrote:

Bolted to Floor wrote:

Drilling a 10.5" flywheel for 10 clutch might be an option. Had to have that done for the FE. Flywheel was 11" and clutch was 11.5. The shop charged me less that $50 to do it. 

I'm not a numbers guy...butt how do you get an 11-1/2 inch clutch to fit an 11 inch flywheel?

He's talking about the bolt pattern for the pressure plate.  It was drilled for an 11" clutch and he had it redrilled to accept an 11.5". 
 

Yea, what he said!!


John  -- 67 Mustang Coupe 390 5 speed
 

6/27/2022 6:48 PM  #17


Re: 28 oz vs.50 oz balance help

Spacer will look sort of like this one but will have three bolt holes instead of four


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/27/2022 7:03 PM  #18


Re: 28 oz vs.50 oz balance help

One of the things to take care of is the bolt spacing on the harmonic balancer.  Ford has both 3 & 4 bolt crank pullies.  I have a balancer that comes with both, so I do not have to deal with it.  It also came with a weight that would make the 28oz balance into a 50oz balance.  It's been so long that I can't remember the maker.


Original owner - 351w,T-5, 4whl disks, power R&P
 

6/27/2022 7:08 PM  #19


Re: 28 oz vs.50 oz balance help




I used the 289 model and it comes with three spacers for the different pulley offsets and can be used with 3 or 4 bolt pulley.

Summit also has 28 oz and 50 oz counter weights if you decide to change engine and remove for internal balance as well.

I figured this was good enough for a street driven car in my case.

I also recall an SFI rated ones as well.

The balancer is bare metal.  So paint or clear if desired.

 

6/27/2022 7:17 PM  #20


Re: 28 oz vs.50 oz balance help

 

6/27/2022 11:14 PM  #21


Re: 28 oz vs.50 oz balance help

The friend I am getting engine from said he has a few 50 oz flywheels if I need one. I just need to figure out which balancer and spacer I need it is a 3 bolt pulley on it now and I have power steering and A/C


Its really me....I fixed my caps lock .
     Thread Starter
 

6/28/2022 12:22 PM  #22


Re: 28 oz vs.50 oz balance help

If you use the one piece fuel pump eccentric with the late model timing chain then the eccentric may hit the back of the timing chain cover.

 

6/28/2022 6:03 PM  #23


Re: 28 oz vs.50 oz balance help

RTM wrote:

If you use the one piece fuel pump eccentric with the late model timing chain then the eccentric may hit the back of the timing chain cover.

The eccentric must match the timing chain sprocket. All the timing covers have same clearance.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/28/2022 7:07 PM  #24


Re: 28 oz vs.50 oz balance help

He's going to have to use his old timing cover anyway or deal with drilling a dipstick hole and reverse water pump issues.


If multiple things can go wrong, the one that will go wrong will be the one that causes the most damage.
 

6/28/2022 8:43 PM  #25


Re: 28 oz vs.50 oz balance help

Greg B wrote:

He's going to have to use his old timing cover anyway or deal with drilling a dipstick hole and reverse water pump issues.

Yep
Use 289 cover, pulleys and custom balancer.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

Board footera


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