flywheel swap
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Elder User
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From: Cheney, Wa
flywheel swap
i've got a 72 390 engine and a 76 360 flywheel, are these motors both internally balanced? and will the flywheel work on the motor. also i've heard of an elusive 12" clutch for these truck motors was there a special flywheel for that, that'll i'll never be able to find in a junkyard or with most flywheels work? thanks for the info
Lead Driver
Joined: Jan 2003
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From: Ohio
Yup, the ONLY motor not internally balanced was the 428! The stock flywheel could be told by the extra PIE piece on back of wheel.
They did have a 11 1/2" for HP option cars. I would bet they had a 12" for big truck applications too. I would not sweat it. With the quality of clutches available now there would be not any real reason to try to get the 12".
They did have a 11 1/2" for HP option cars. I would bet they had a 12" for big truck applications too. I would not sweat it. With the quality of clutches available now there would be not any real reason to try to get the 12".
Fleet Mechanic
Joined: Aug 2004
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From: NE Tennessee
Set the flywheels on top of one another. Teeth count, diameter, and hole alignment will be your concerns. If they match ya should be good. If ya don't have the old flywheel maybe take yours to a local parts store and compare it to a new one they have in stock.
If your truck had a 12" clutch and flywheel from the factory, an 11" or 11.5" flywheel probably isn't going to let the starter engage. Also you will need the clutch that fits the flywheel ya have.
With you having a motor without the flywheel I'm figuring your doing some kind of engine change. Do you have the old original flywheel from the engine or is that the 360 flywheel? If it is and the motors are internally balanced I'd bolt it up and go
If your truck had a 12" clutch and flywheel from the factory, an 11" or 11.5" flywheel probably isn't going to let the starter engage. Also you will need the clutch that fits the flywheel ya have.
With you having a motor without the flywheel I'm figuring your doing some kind of engine change. Do you have the old original flywheel from the engine or is that the 360 flywheel? If it is and the motors are internally balanced I'd bolt it up and go
Elder User
Joined: Nov 2002
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From: USA
I just bought a LUK 12" clutch from Dial-a-clutch. They didn't have the 11 1/2" listed, and showed the 12" as an upgrade. I checked the alignment of the bolts before sending the flywheel to be resurfaced and they looked like they lined up. I didn't do a real good job of that though since I didn't want to take the new clutch out of the plastic packaging yet, I just set the old pressure plate on top of the new one.
I assume the 12" clutch will work on my old flywheel, if not I will soon find out.
Jordan
I assume the 12" clutch will work on my old flywheel, if not I will soon find out.
Jordan
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Elder User
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From: Cheney, Wa
Originally Posted by Spaznaut
Set the flywheels on top of one another. Teeth count, diameter, and hole alignment will be your concerns. If they match ya should be good. If ya don't have the old flywheel maybe take yours to a local parts store and compare it to a new one they have in stock.
If your truck had a 12" clutch and flywheel from the factory, an 11" or 11.5" flywheel probably isn't going to let the starter engage. Also you will need the clutch that fits the flywheel ya have.
With you having a motor without the flywheel I'm figuring your doing some kind of engine change. Do you have the old original flywheel from the engine or is that the 360 flywheel? If it is and the motors are internally balanced I'd bolt it up and go
If your truck had a 12" clutch and flywheel from the factory, an 11" or 11.5" flywheel probably isn't going to let the starter engage. Also you will need the clutch that fits the flywheel ya have.
With you having a motor without the flywheel I'm figuring your doing some kind of engine change. Do you have the old original flywheel from the engine or is that the 360 flywheel? If it is and the motors are internally balanced I'd bolt it up and go
also this is an offroad truck, big tires, plenty o ponies, and probably will only see mud and sand with the occasional pavement. the downside is i'm running 36 on the stock 3.50 gears (for now) but i don't want to be burning up clutchs one crazy old guy i was taking to was telling me he couldn't remember how many times he swap the 11"er's for 12"er's cause the guys burnt them up. so i'm thinking well hey thanks for using all the good flywheels. but i did also see 12" clutches cross listed for the 460 and 390, do they have the sameish flywheel or are the teeth going to be off.?
Lead Driver
Joined: Jan 2003
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From: Ohio
Actually the 460/429 and FE use the same flywheel. The only difference was the 428 needed the extra weight to make it balance correct.
If you check Summit or such you will find that the part number is the same for both style engines. It will just say that it will not work on a 428 since it needs rebalanced. It should be 184 teeth for the 11" clutch. I would bet the 12" is bigger, which I would assume you will need the correct bellhousing to locate the starter. This may be the problem with using a 12", finding a big bell for a FE. The 460 stuff is probably more readily available with all the F500/600+ stuff from the 80's still around.
If you check Summit or such you will find that the part number is the same for both style engines. It will just say that it will not work on a 428 since it needs rebalanced. It should be 184 teeth for the 11" clutch. I would bet the 12" is bigger, which I would assume you will need the correct bellhousing to locate the starter. This may be the problem with using a 12", finding a big bell for a FE. The 460 stuff is probably more readily available with all the F500/600+ stuff from the 80's still around.
Last edited by Freightrain; Jan 5, 2005 at 10:05 AM.
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Elder User
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From: Cheney, Wa
good point about the bell housing....welp 11" it is
just out of curiousty any suggestions on clutchs?
just out of curiousty any suggestions on clutchs?
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Posting Guru
Joined: Jul 2003
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From: Colville, Washington
Clutch ?s
I remember seeing 11 1/2" clutches listed for the 390, but never a 12". The 390 flywheel was different to fit the 11 1/2" clutch as well as a different bellhousing.
BTW, the 410 was also externally balanced, it had the same crank as the 428. :-)
I would look at the Centerforce clutch line, they have much improved holding power over stock. Also McCloud and Ram offer HD components.
BTW, the 410 was also externally balanced, it had the same crank as the 428. :-)
I would look at the Centerforce clutch line, they have much improved holding power over stock. Also McCloud and Ram offer HD components.
Last edited by Putt; Jan 5, 2005 at 10:29 AM. Reason: Clutch rec.
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Elder User
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From: USA
Posting Guru
Joined: Jul 2003
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From: Colville, Washington
Jordan, the 390 truck did use a 11 1/2" clutch as the books listed it. It may have measured 11 7/8" as your source ID'd. While a parts man I sold many clutches for "390's", which all our catalogs showed as 11 1/2" stock, 98% of them had 11" clutches. We did not even stock the larger. Maybe they were a hd or trailer towing package option?
I have seen reference to a larger bellhousing needed to clear the OE style 11 1/2", maybe the newer ones use a shorter pressure plate? A diaphragm style cover would fit in the stock type bellhousing, as long as the bolt pattern matched up.
The LUK clutches are high quality from what I have seen. There is a clutch supplier that is a FTE supporter, you might check at Motorhaven here.
I have seen reference to a larger bellhousing needed to clear the OE style 11 1/2", maybe the newer ones use a shorter pressure plate? A diaphragm style cover would fit in the stock type bellhousing, as long as the bolt pattern matched up.
The LUK clutches are high quality from what I have seen. There is a clutch supplier that is a FTE supporter, you might check at Motorhaven here.
Lead Driver
Joined: Jan 2003
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From: Ohio
I run a Centerforce Dual friction in my '69 F100 428. Works well, easy pedal pressure. I think they are around $350 for plate and disc.
I don't think you will notice any difference between using a 12" and the 11". You can burn either up pretty quick if slipped hard in the mud. No clutch could handle that abuse. I think that would just be considered a "normal" wear item in that application.
(Oh, ya, the 410...forgot that one
)
I don't think you will notice any difference between using a 12" and the 11". You can burn either up pretty quick if slipped hard in the mud. No clutch could handle that abuse. I think that would just be considered a "normal" wear item in that application.
(Oh, ya, the 410...forgot that one
)
Elder User
Joined: Sep 2003
Posts: 794
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From: Portland, OR
Centerforce works well. I've been running the dual friction under extremely heavy towing conditions for around 75,000 miles now without a hickup. Munched 3 435's, but the clutch is still going behind the NV4500. Haven't heard of anyone having problems with the dual friction in american applications. Know alot of toyota owners that are not happy at all with the dual friction.
Dustin
Dustin