I have a 250 from a 1971 Nova. It came with a powerglide. I'm going to put in a manual trans from a 92 S10. So, as far as I can tell, I will need a 168 tooth flywheel. Now for the question: is there any difference between a flywheel for a 71 Nova, a 71 C10 or an 85 Astro? From the same parts house, I find 3 wildly different prices for a 168 tooth flywheel for the 2 piece rear main seal. From $52 for the C10 (w/250) to $85 for the Astro (w/4.3 v6-same engine my trans is from) and up to $127 for the 71 Nova(w250). The descriptions for the C10 say 14.17" OD while the Nova claims 14.13" OD. No dimensions for the Astro. Can there really be this many Chevy 168 tooth flywheels? Thanks, Dave
Should all be the same, except for clutch diameter maybe. There were different bolt patterns used depending on the size of the clutch pressure plate. As long as you get a clutch that matches the flywheel, and also a starter that matches it, then you should be ok.
WHY the 168 14" diameter flywheel for a 250? It would have come with a 153 tooth flexplate/flywheel, as did "most" sixes and SBC's since 62 (except for the big blocks, hi-po engines, and trucks). A 153 tooth flywheel will take a 10.4 clutch, far more than you really need with a six. Easier and cheaper to find also. Unless you want the bigger flywheel for some particular reason (like the weight/enertia to help get a vehicle moving), use the smaller flywheel. The 168 tooth flywheel takes a different starter than the 153 tooth, so if you have the starter from the six, the larger flywheel will need a different starter. Basically, any six, SBC, BBC, and most V-6 (Chevy), NEUTRAL balanced flywheel/flexplates will work, as long as the compatible starter and clutch ***embly are used. Craigs list and the Bay are your friends, buy used and maybe get it resurfaced. Butch/56sedandelivery.
The flexplate I have is the smaller 153 tooth variety. But since I'm using a transmission (NV3500) that originally had a 168 tooth flywheel I was under the impression that I should use a flywheel that was the same. Is that not correct? I've looked at used ones, but they seem to be around $40-50 plus another $40 for resurfacing--so new is just as cheap, er....frugal.
Unless you are intending to pull heavy loads with the vehicle you don't need the big fly wheel. If you were closer I'd give you one as I seem to have them stacked up like firewood out in the shed. The big flywheel also require the matching bellhousing that will clear it and the clutch. What is it going in and how are you going to use it?
It's going to go in a 1929 Chevy frame that I'll be building a wood body on. This is going to be an easy cruiser--I don't anticipate any hard driving at all. As I say, I have a NV3500 5spd transmission from a 1992 S10. That came with a 168 tooth flywheel--the clutch disk that came with the transmission is 11". I thought it best to buy a new clutch kit designed for the original truck to keep everything as easy as possible. It seems like the price of flywheels (new or used) is all over the board! Thanks, Dave
I have a flywheel from a '92 GMC S-15 4.3 V6 and it is one heavy dude. Much thicker and heavier than straight six or V8 flywheels in my experience. Though that may be what was in front of your ****** originally, I wouldn't think it would be very desirable for your application. Ray
Use your 153 tooth flywheel, a 10.4 clutch and pressure plate, and the stock starter. You should be fine, and it will be more than adequate for what you are doing. Bigger, is'nt always better; it would be here, but you'll be fine. Butch/56sedandelivery.
Ok lets get specific..The 4.3 flywheel will not work...Its for a 2pc rear main. You need a 153 tooth flywheel so that you can continue to use the 250 starter ! The pressure plate will be from whatever the flywheel is from and the clutch disc will be from the s10.... Simple enough.. Dave
Ok, first let me say "Thanks for your patience." Now, let's see if my dull brain is getting this. I can get a 153 tooth flywheel. Then I need a 10.4 pressure plate. Next I'll need a friction disc to fit the pressure plate. I cannot use the 1992 S10 disc which came with the transmission, because it is 11" in diameter. So, I could use, say a 10 3/8" friction disc from a 1979 Camaro with a 250. That disc (I believe) has the same inside diameter as the 1992 S10 = 1 1/8" and the same 10 Tooth spline. Then use a release bearing and pilot bushing for the 1992 S10. How good are the chances that everything will work together without clearance issues with flywheel bolts, etc?
You should be able to use either size flywheel, but as you noticed you need to make all the parts match. Does the trans have a built in bellhousing? If so, then the large flywheel would probably be the way to go, then you can use all the clutch parts that match the transmission, but you'll need the correct starter (the small and large flywheels use different starters, and different length starter mounting bolts). Make sure there are 3 bolt holes on the block where the starter mounts, first, because the different starters use different pairs of mounting holes.
Yes, the trans has an integral bellhousing. I'll have to check to see what the starter mounting situation is. I suppose I can always get one of those mini starters with the dual mounting if I need to. I'll have to get a new starter anyway if I go with the bigger flywheel....Thanks, Dave
OK, A little more specific..... Any small block, pre 84 (2pc rear main) 153 tooth flywheel will work on your 250. If your s10 trans has 1 1/8" 10 spline input, then you are good to go. All you need at this point is to order whatever clutch kit is appropriate for your flywheel.... The only question will be the throw out bearing. Is the s10 trans equipped with a hyd. throw out ?? The early s10's had mech. linkage and will be a little easier to make work. If you need part #s just shoot me a pm with all the info ( flywheel, tob etc..) and I can look it up for you.. Its what we old , retired parts guys do for fun..LOL !
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