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Old 01-04-2009, 03:35 AM
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is it pssible to make a 283 into a 327 stroker?

well i had this wild idea it started with my team blowing yet annother 350 up at the track. we are racing a 1/4 mile oval track. and i got to crunching numbers because the owner of the car wants to build a 327 for it. so i went to work and i got the idea of trying to change the numbers to make a 327 and found that by calculation you can make a 283 into a 327 by using a 350 crank. and with stock bore it comes out to 328.32. so my question is will it work? has it been done? and would it be more bennaficial just to use a small journal 327? or would i be able to make more torque and hp out of making the "stroker" 327?

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Old 01-04-2009, 04:42 AM
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Yes you can make a 327 out of a 283 . First you will need to Bore the 283 Block out to 4" . If you want to do this the early 60s 283 Blocks have the thicker walls . Next you will need a S/J 327 3.250" Crankshaft . Now the Bad thing with this S/J Build is even the HD S/J 327 Rods only have the 11/32" Bolts . Yes you could buy some Pro Rods that have 3/8" Cap Screws . But you still will have a Block that is only a 2-Bolt Main . The Better stronger 327 is made from a 350 4-Bolt Block with a Forged 327 3.250" L/J Crankshaft with the 3/8" Rod Bolts . Ether build will take std 327 Pistons .
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Old 01-04-2009, 07:47 AM
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The only way you could use a 350 crank in a 283 is if you had the main journals turned down to the small journal crank size and I don`t think you can turn them down that far, providing you could, you would have to find a 283 block that has a clearenced webbing, the early blocks don`t have them so the longest stroke crank you could use in them was 3 inch stroke cranks. However, i`m still trying to see the logic here, why go down the latter in cubic inches? if 350 is the limit stick to it. If you did find a way to use a 283 block with a 350 crank, it`s not going to make as much power as the 350, and it`s not going to hold together any better just by making the bore size smaller. If your on the track and blowing 350`s I`d find out why, clearence specs too loose? stock bolts reaching there limit and failing due to reuse too many times? fuel supply going too lean and detonation is setting in? there can be many things that make them blow, usually when good parts are used and your only revving them to 6000 they hold up fine, but if detonation is setting in no engine can survive that. So before I went down on cubic inches I would find out why the 350`s were blowing.
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Old 01-04-2009, 08:03 AM
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I'm glad the journal size difference was pointed out. There are 2, if I'm not mistaken,327 main journal sizes. The 283 used to be punched out to 4" regularly, although the combination you want to run seems like it might be better tried in a later small bore block. An original 283 with the right # on it might have more value to an early Chevy collector/restorer. If the combo you want to build catastrophicly fails it's no good to anyone and would be hard to duplicate without some parts chasing. The fact that there have already been at least a couple 350 engines blown up, there should be plenty of available knowledge as to why, doesn't give a good precedent for a "new" combination based on 40+ year old parts.
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Old 01-04-2009, 10:03 AM
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If you want a 327 I'd just put a 327 crank in a Vortec 4bolt block. You'll have hyd. roller setup, newer easier to find castings, and they're pretty tough. Of course if you're racing it you may not want to go hyd. roller, but if you do that is an option.

Or you can get the new lower buck block from Dart and run a 400+ci engine.

Most of the time people try to get all the displacement they can to make the most power...
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Old 01-04-2009, 12:59 PM
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well the thing with going up with stroke is we are limited inout class 350 is as big as we can go. the 2 motors that we blew were not motors i built. one was given to us and we were told it was "freshened up" all they did was replace rings. so that motor was kinda shooting blind anyways. and the other was the motor we got when we bought the car. so that was blind racing with tha too. the reason we want to go to a 327 is a shorter stroke to achieve faster responce in a shorter distance because we are on a short 1/4 mile track. and a standard 327 has a short stroke. i was just wondering what the more bineficlial way to go would be as far as responce and power with a std 327 or a stroked 283. we do have 2 small journal 327's so we may just use those from the sounds of it. and as far a using vortec stuffits out of the question in our class racing. we are racing street stock class so it has to be a stock built engine that uses a carb. and we are limited to using 500cfm carbs. great fed back thanx any more ideas would be great.
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Old 01-04-2009, 01:21 PM
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Even if you manage to turn a 283 into a 327, by the time it is done you will have probably spent more money on it that if you would have by just obtaining another rebuildable core and starting with what you want in the first place. From an ecinomical point of view it makes no sense. Just fyi, a 307 IS a stroked 283.
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Old 01-04-2009, 01:28 PM
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If you want a 327 and you already have 2 small journal 327 cranks, I think your best move is to get a 2 piece rear main 350 4 bolt block and some bearing spacers and build a 4 bolt 327.
I've got a link to info on the spacers, but it's on my computer at work.
JA
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Old 01-04-2009, 01:48 PM
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Or.....you can use the 307 crank in the 4-bolt 350 block.Dig around in some old Chevy trucks at the salvage yard or talk to a machine shop.Nothing special is needed except a balance job.
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Old 01-04-2009, 02:00 PM
How fast is fast enough?
 
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If you're keeping the redline fairly decent (below 7,000 RPM) you really can't beat a Vortec 4bolt short block. The rods will hold with new bolts, the crank will hold if balanced well, 4 bolt mains... They have no problem taking 500hp which is probably more than you had. Couple that with a no maitenance hyd. roller cam and you have a circle track engine built for around $3000 that can make 500hp and be driven to and from the track.

while shorter strokes are more responsive off the turns displacement will still be king. A 3.25" stroke in a 4.125" bore is better than a 350's 3.48 stroke in a 4" bore, but just shortening the crank's throw will leave you in the dust.

If you're serious I'd recomend a 3.25" stroke in a Dart 400 block with 6+" rods but from the sound of it your budget won't allow that.
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Old 01-04-2009, 03:36 PM
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Quote:
Originally Posted by talon0713
well i had this wild idea it started with my team blowing yet annother 350 up at the track.

Build a better 350 it will outperform the 327 any day of the week. I built three "budget" 350's for last season for three different teams. Using stock type components and they turned 7200-7500 rpm's all season and never had a failure on any of them.

These motors cost around 3k each complete, if you do it right they will last a long time. These were all raced in street stock and Midwest Mod (b-mod) classes.

The amount of machining and labor involved with doing a 327 out of a 283 just to have a motor that has less torque and HP is not worth it. Anyone who tells you that a smaller motor will be better is trying to get you to lose or had their car setup wrong so that a motor with less power worked better.
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Old 01-04-2009, 09:18 PM
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again as far as vortec heads are concerne they are not allowed in our class. but thanx. and with the dart blocks theyalso are not allowed in our class. we have to use stock from the factory blocks and the most compression we can use is 190 psi. we have 2 327 small journal blocks and i think im going to try to find some 4 bolt splayed caps for it because i have found that std 4 bolts are alot weaker due to the fact that the 2nd set of holes goes into the webbing a weaker point of the block and the splayed actually goes into the side of the block. and there is 1 other small journaled 327 on the track and hes FAST. this last race he finished 1/2 lap ahead of 2nd place car. i know that has to due with the chassis set up as well witch we have dialed in. he cant pull away from us in corners only just out of the turns. so im thinking theres something to useing the 327. if anyone has input on where to find some small journal splayed caps that would be great. thanx

oh and one more thing i havent torn in to the 327 yet and was wondering what the actual measurement differance is on the small journal vs. a std journal... thanx again for the input.
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Old 01-04-2009, 09:30 PM
How fast is fast enough?
 
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you sure it wasn't a 327 crank in a 400 block? A 327 will be slower than a 350 with all things being equal. Especially if you're limited to stock heads.
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Old 01-04-2009, 09:44 PM
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yesd im sure it was a 327 small journal because you cant run a 400 block in our class and i looked at his engine code. its exactly the same as the 2 327 blocks i have. now rather if it is bored .040 or .060 over or sumthing i have no idea. but we had a modified engine that we blew that was a built to the gills 350 that couldnt catch him coming out of the corners. i do know that with just making a shorter stroke you get alot faster response out of the hole. and a std 350 and 327 is the same bore 327 is just a shorter stroke so if he has it bored it would be easier for him to run away out of the corners.
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Old 01-04-2009, 09:46 PM
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oh ya we also found out that the heads on the 327's are both 496 heads which are supposedly realy good flowing stock heads.
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