Small block flywheels - Nova Tech
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  #1  
Old Mar 2nd, 20, 05:32 PM
buddyami buddyami is offline
 
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Default Small block flywheels

Does anyone make a flywheel weighing 25-30 pounds for a small block 2 pc rear seal that costs under $200.00. I'm afraid the ones I see so far in that price range are to lite at 15- 18 pounds. I will be running a M-20 with 3.08 gears.

your thoughts please...
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  #2  
Old Mar 2nd, 20, 07:03 PM
62 NovaWagon 62 NovaWagon is offline
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Default Re: Small block flywheels

Here ya go..

https://www.summitracing.com/parts/p...make/chevrolet
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  #3  
Old Mar 2nd, 20, 09:17 PM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

Man I appreciate the help but I have one of the original Chevy 2 bell housings with the 7:00 clutch fork location. I may be wrong (Hope I am) but I think I have to use a 153 tooth flywhweel. The one you linked me to is a 168 tooth.
Can I use that. I hope so?


TKS, BB
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Old Mar 2nd, 20, 10:02 PM
62 NovaWagon 62 NovaWagon is offline
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Default Re: Small block flywheels

Summit carries those too check em out.
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Old Mar 2nd, 20, 10:03 PM
Big Dave Big Dave is offline
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Default Re: Small block flywheels

You are correct the 168 tooth fly wheel is for big blocks and high horse small blocks using the 11 clutch disc. The Chevy II never had an 11 inch disc and used the smaller 153 tooth flywheel.

On the street and drag racing you want the heavier steel wheel to use the fly wheel's inertia to launch the car. The aluminum version is for Road Racing or Circle Track competition where fast reving is more important than clutch wear.

Big Dave
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  #6  
Old Mar 3rd, 20, 08:38 AM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

TKS Dave..
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  #7  
Old Mar 4th, 20, 10:25 AM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

OK Dave , one more question. As best I can tell the 64 v8 Nova probably came with a GM number 3971021 flywheel. Appx 30 pounds 12.75 o.d.and fit 63 or so on up the small blocks into early 70's.
Now my delimna is Summit and others listings of what their 153 tooth 2 piece seal 25-30 # flywheels will fit do not agree with this info. I think the differance is some info shows a 10.5 clutch disc and some show a 10.4 clutch.
If these two discs will interchange with any 153 tooth, 2 piece seal flywheel my problem may be solved.
Can you provide input here or opinion.
TKS, BB
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Old Mar 4th, 20, 11:07 AM
Big Dave Big Dave is offline
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Default Re: Small block flywheels

All two piece cranks share the same 3⅝" bolt pattern. To this crank you can bolt a 10", 11 or even a 12 inch clutch assembly. The difference in fit is in the bell housing clearance and the starter motor. A one pice rear main seal crank has a smaller 3" bolt pattern and it uses a different clutch assembly offset.

The 168 tooth bell housing uses the same bolts to attach it to the block and transmission, but the bell is wider; opened up to clear a larger diameter fly wheel and pressure plate. The 10" inch bell housing drops from the top of the bell to the tranny mount faster. So you can use a an 11" bell housing in most applications (except yours) with a 10" inch clutch assembly; and just have more room inside the bell and less between the bell housing and the floor boards. That is what I did, because I used a safety can (a SFI rated explosion proof steel bell housing) 11 bell housing on everything except my Corvair because I no longer owned my '427 powered '67 Chevy II at that point.. You can not use an 11" inch clutch assembly inside a 10" bell housing as it will rub the aluminum housing and weaken it to the point of falure.

Your car had to jump through hoops to get it to work with a V8 that it was never designed to accept. Clutch linkage lowering was one of those hoops. Which required a special block and bell housing.

Big Dave
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  #9  
Old Mar 4th, 20, 07:55 PM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

Thanks Dave. So knowing what we know do you think I can get by with the 10.5 flywheel in the chevy 2 bell housing that I gather was designed for a 10.4 clutch. I wonder if the OD of the 10.5 clutch flywheel is the same as the 10.4 clutch flywheel.
As best I can tell from reseach the 10.4 flywheel measures 12.75". Some info sites say the 10.5 clutch and the 10.4 will interchange. The original flywheel was as I understand it GM # 3971021. And has anyone tried the common aftermarket 2pc 153 tooth flywheels in an original chevy 2 bellhousing.

Thks for your patience Dave.

BB
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  #10  
Old Mar 5th, 20, 07:11 PM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

I have decided to pick the RAM 1511 flywheel for my Nova. it seems to meet the criteria. 26 # not 30# but probably close enough.
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  #11  
Old Mar 5th, 20, 07:28 PM
62 NovaWagon 62 NovaWagon is offline
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Default Re: Small block flywheels

Let us know if it works out for ya..
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  #12  
Old Mar 8th, 20, 11:17 AM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

Will do.
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  #13  
Old Mar 9th, 20, 12:33 AM
is one duece enough ? is one duece enough ? is offline
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Default Re: Small block flywheels

i would not use the 3971021 flywheel

my suggestion locate a # 3973455N
very easy to find as it is a common marine mercruiser take off flywheel. The ones i have used in the past never previously had clutch discs installed so hence no heat or cracking issues (in marine application its only used for the ring gear for starting) no clutch.
It’s also far superior because its Nodular Iron, noted by the last letter in the casting numbers.
where the 021 is not.!
Nodular iron is a upgrade usually most noted in hp engine main caps
but the same is true in these flywheels.
(its a old well known circle track fact.)
Look on ebay they are sometimes as low as $50 to $75
3973455N works in your application for 62-67 nova 4 speed applications depending on the motor. Fits some early corvette, camaro too
If you want to keep your 62-67 nova stock appearing by using the brittle cast aluminum bellhousing rather than a scattershield at least upgrade to a nodular iron flywheel its sound advice.

Last edited by is one duece enough ?; Mar 9th, 20 at 01:35 PM.
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  #14  
Old Mar 13th, 20, 07:07 PM
buddyami buddyami is offline
 
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Default Re: Small block flywheels

I appreciate the info ..BB
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