10.5 in flywheel starter help - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-11-2008, 07:28 PM
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10.5 in flywheel starter help

ok i have a 10.5 in flywheel andi went and got a universal chevy 350 starter for my 350 but when i put it on the gap was like 2in there was no way it would work. i think the starter was 16? somthing tooth, my questions is if i get a 153t starter will it work. From reading i think the 153t starter has more of an offset to wards the block.

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Old 09-11-2008, 07:39 PM
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Here`s how it works. There were 2 flexplates / flywheels on chevy small blocks. The 12 and 3/4 inch 153 tooth flexplate used the straight across bolt pattern starter. The 14 inch 168 tooth flexplate used the staggerd bolt pattern starter. So if you have the 12 inch flexplate and you bolt on a staggerd pattern starter it will miss by about almost 2 inches. If your using a larger cubic inch, higher compression engine you should use the 168 tooth flexplate and staggard pattern starter, this gives it more reduction for easier starting. The 153 tooth jobs only came on small displacement easy to turn over engines.
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Old 09-11-2008, 08:14 PM
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Quote:
Originally Posted by DoubleVision
Here`s how it works. There were 2 flex plates / flywheels on chevy small blocks. The 12 and 3/4 inch 153 tooth flex plate used the straight across bolt pattern starter. The 14 inch 168 tooth flex plate used the staggered bolt pattern starter. So if you have the 12 inch flex plate and you bolt on a staggered pattern starter it will miss by about almost 2 inches. If your using a larger cubic inch, higher compression engine you should use the 168 tooth flex plate and staggard pattern starter, this gives it more reduction for easier starting. The 153 tooth jobs only came on small displacement easy to turn over engines.
What would a 10.5" flywheel fit?
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Old 09-11-2008, 08:19 PM
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I dunno J, I`m yet to deal with one. But hey, I always keep a open mind!
10 inch flywheel with a 3 tooth starter might be enough reduction to turn it over. I think he meant a 10 inch clutch, same one I have in my chevy pickup that I just replaced with a RAM unit, which is good compared to the auto zone special the previous owner stuck in there.
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Old 09-11-2008, 08:59 PM
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Starter

Double vision is correct....count the teeth on the flywheel....then count em again, .......the look at the bolt pattern on the block......then go get the correct starter.
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Old 09-11-2008, 09:08 PM
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i know the 10.5 in flywheel came on early 60s model corvetes. I had to use this because i had ot have a special clutch disc that is 10.5 in so im not sure how many teeth the flywheel is but i think i can find it on the net cus i belive all the 10.5 are the same tooth count. Even if i no the tooth count how wouldi know which starter?
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Old 09-11-2008, 10:44 PM
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OK, there's no such thing as a 10.4" flywheel. Some cars came with 10.4" (AKA 10-3/8") clutches and 153-tooth flywheels, and some came with 10.4" clutches and 168-tooth flywheels. A '69 Camaro with 327/2bbl/3-speed came with the former, and a '72 Nova with 350/4bbl/4-speed had the latter. No telling how many other combinations were devised by GM's overpaid Geniuses, and the only thing for absolute certain is that an 11" clutch won't fit on a 153-tooth flywheel.

I don't know what kind of engine you're dealing with, but the smaller flywheel is likely all you need. Some of the high-performance 427 Corvettes used them back in the '60s, and my old 292 6-cylinder with a compression ratio well into the two-digit range started fine with the original starter from a 6-cylinder '69 Nova, also a 153-tooth setup. The high-compression engines generally have a big enough camshaft that cylinder pressure is not that much of a problem.
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Old 09-12-2008, 06:27 AM
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well i guess you saying that all gm flywheels are eather 168 tooth or 153 tooth no matter what size they are.
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Old 09-17-2008, 09:55 PM
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Chevy, 6's back to 1963, V-8's back to '55, don't know about earlier 6's. I don't know about other GM divisions. I saw an interchange listing that said I could use a late-'50s Corvette 153-tooth flywheel on a pre-'86 350 if I could find a a good one. I'm still looking.
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