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Old 03-27-2005, 07:17 PM
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302/351C flywheel

Will a flywheel off of a 1970 302 flywheel work on a 70 351C? is there any sort of balance issues I need to be aware of? thanks

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Old 03-27-2005, 07:48 PM
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flywheel swap

Yes, you can use your 70, 302 flywheel on a 351C.
All 351C and W and 302's used the same flywheel up til about 84, when they changed the offweight on the 302, only, from 28 oz to 54 oz.
You may also use the same bellhousings and engine mounts.
Harmonic balancers, however, will not interchange between the three engines.
One other caviat. Some of those cranks werent drilled for a pilot bearing for the input shaft for a standard transmission, so not knowing what transmission you are using, you need to look at that. Other than that, a standard shift flywheel will work on an engine that had an automatic in front of it and vise versa.

Last edited by Max Keith; 03-27-2005 at 08:45 PM.
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Old 03-28-2005, 10:51 AM
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Quote:
Originally Posted by Max Keith
Yes, you can use your 70, 302 flywheel on a 351C.
All 351C and W and 302's used the same flywheel up til about 84, when they changed the offweight on the 302, only, from 28 oz to 54 oz.
You may also use the same bellhousings and engine mounts.
Harmonic balancers, however, will not interchange between the three engines.
One other caviat. Some of those cranks werent drilled for a pilot bearing for the input shaft for a standard transmission, so not knowing what transmission you are using, you need to look at that. Other than that, a standard shift flywheel will work on an engine that had an automatic in front of it and vise versa.
I wonder why they changed the weight offset, anybody know?
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Old 03-30-2005, 07:48 AM
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All 351 Clevelands are 28oz balanced. However there are two size flexplates. Both will work, as long as you have the correct size bellhousing and converter.

The small one is 157 teeth. It uses a converter with a 10.5 bolt pattern. Found on the small bellhousings C-4 trans.

The bigger one is 164 tooth. The converter uses an 11 7/16 inch bolt pattern. The 164's are in large bell housing C-4's, FMX and small block C-6's. Also remember that the C-6 flexplate is the same diameter, but has a little bit different offset. It will work, but you may need to space the converter bolts with one washer under each stud to push the converter closer to the trans.

The 164 tooth was also used with the AOD trans. Be careful here. If the AOD was behind a 351W the balance is correct and it will work. If it was behind a 5.0L then the balance is 50 oz/in and while it will physically fit, but the balance is off and your motor will shake

The 164 was also in some trucks with in line 6's, be carefull here because those have a zero balance.

Balancing was probably changed due to the cost. They changed to a different casting which was lighter, thinner, weaker, I would guess that keeping a 28oz balance on these would be more expensive
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Old 03-30-2005, 07:58 AM
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well when I went to put the tranny off of my 302 on the 351C, it bolted up but the starter wouldnt fit becuse the housing was to narrow side to side. but it bolted up. so then I tried to put the bigger bell housing from another c4 on it but then the converter wouldnt fit. so I ended up taking the kit out of one c4 and putting in the one with the bigger housing. why is there different sizes of housings. are some blocks wider than others? do they make a smaller starter for the 351C and small c4 housing? Im cornfused. either way it all has been working great for the last 4 years, im just getting ready to put a stall converter in it and was unsure of the bolt pattern of the converter, and I also have a new flywheel laying around that I think I bought for it, but can tbe sure and wanted to see if there is anyway of identifying it. it has a weight on it and 164 teeth and the 11 7/16 BP. I just cant remember if it goes to my 302 or the 351.
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Old 03-31-2005, 10:03 PM
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bellhousings

The reason for the two different size bellhousings and flywheels was due to using the smaller one in stuff like mavericks and mustang 2's. C-4 bell housings will interchange, just be sure you have the matching flywheel to the bellhousing.
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Old 04-01-2005, 09:27 AM
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302 flywheels

while on this topic i have several drive plates they have no partno how can i tell which weight. The weights all look the same. any sugestions would be apreciated , cliff
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Old 04-01-2005, 10:29 AM
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What did they come off of cliff. Post a photo of it, the 50oz flexplates are pretty big. If you cant post a photo goto the junk yard and match up a newer 5.0 flexplate to see if the weight matches.
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