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Old 07-28-2003, 05:36 AM
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Long rod 302

I have a question? I have a set of pistons, (manley .400 dome nitrous pistons for a 6" rod 327 standard bore) and since I have no standard bore 327, I was wondering if maybe I could punch out a 283 to a 4" bore and make a long rod 302..you can view the pistons here..http://www.racersauction.com/auction...fm?lotID=45172

will it work?

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Old 07-28-2003, 05:16 PM
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you could bore the 283 to a 4 inch bore and use a small journal 327 crank but not the 283`s crank, as the compression height will be off due to the 283`s shorter 3.00 inch stroke compared to the 327`s 3.250 inch stroke. the piston would be low in the bore due to the 327 pistons shorter compression height if you used a 283 crank. you could also use a 350 block and a 307 crank to make a 327, as long as you didn`t rev it too high and didn`t shoot tons of nitrous to it, and make sure the bearing clearences are on spec it would survive.
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Old 07-29-2003, 02:38 AM
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Thanks DV, The reason for so many q's is because I might buy a set of aluminum rods for this little project and I still dont exactly know what your telling me, please explain just a little more so ill know what type rods I need.. I know I need a 283 block punched out to a 4" bore, a small journal 327 crank, ok, but what length rods do I need? and will that be a 302, or a 327?
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Old 07-29-2003, 03:36 AM
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since your pistons are for 6 inch rods in a 327, then that`s all you can use them for unless you have custom lenth rods made. I`m not sure what you intend on doing with your engine, however, I wouldn`t use aluminum rods, they get brittle as time goes by and break, plus they expand more than steel rods so the clearances would have to be more than usual. I`ll make a list of the bore and stroke`s of most small blocks here.
CID Bore Stroke
265 3.750 3.000
283 3.875 3.000
302 4.001 3.000
305 3.736 3.480
307 3.875 3.250
327 4.001 3.250
350 4.001 3.480
400 4.125 3.750

I left out the small blocks 262, 267, as there not commonly used as performance engines.
As for rods, I would use some good quality steel 6 inch rods.
and as I said in my before post, I would just use a 350 block and a 307 crank, this way, it would be a large journal 327, since the 307 and 327 share the same stroke and the 350 and 327 share the same bore. the 283`s and 1967 and before 327`s were small journal engines and don`t hold up as well as the large journals do. the sizes of the small journal cranks were 2.300 main, 2.000 rod, the large journal cranks are 2.450 main, and 2.100 rod. hope this helps.
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Old 07-29-2003, 04:36 AM
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Alright, thanks again DV, you have me pointed in the right direction...
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