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Old 03-23-2005, 11:39 AM
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strokes, rod lengths and bores

I race at a local dirt track, and as many, am on a very limited budget. I have a 327 large journal, with new crank. Having trouble locating parts for same. Have found several places for 350 parts. I have numerous 350 rods, 5.7 length. Question. Can I covert the 327 to a 350, using the stock crank I currently have, and the 350 rods and pistons, or would I be better served to buy 327 rods and pistons? I would appreciate any help you can offer. TY.

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Old 03-23-2005, 12:45 PM
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Putting 350 rods and pistons on a 327 crank, will only get you a very sick, turd of a 327!!!
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Old 03-23-2005, 01:44 PM
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i don't understand what the problem is if you are using a large journal 327.small journal yes but not the large.rods shouldn't be a problem.
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Old 03-23-2005, 01:57 PM
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First off, all stock small block chevy rods are 5.703, the only one that wasn`t was the 400 small block, which used shorter 5.565 rods. How Chevy made up the difference with different stroke cranks was by altering the compression height of the piston, a 327 has a 3.250 inch stroke, the 350 has a 3.480 inch stroke, so the 327 piston had a 1.675 inch compression height so it would reach the top of the bore, since the 350`s stroke is longer, it used a shorter compression height piston of 1.560 inches. You can place a 350 crank in your 327 block and use 350 pistons and you`ll have a 350, if you used 350 pistons with a 327 crank, the pistons would be short of the top of the bore by 0.115 which would result in very low compression and no quench at all, it would run but it would be quite sick. if you used 327 pistons and a 350 crank, the pistons would be out of the bore by quite a ways. I don`t see why your having problems finding parts for a large journal 327, although they were only in production 2 model years, this is still a popular engine, pistons are avalible for it and since all the large journal small block rods are 5.7 inches they all interchange. you can use a 307 crankshaft in a 350 block and have a large journal 327. I would think the 327 pistons cost somewhat more, the cheapest engine to build and race is the 350, and why is because it`s the most popular.
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Old 03-23-2005, 02:01 PM
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he said he has a 327 large journal crank and is having trouble finding parts.i know all the dimensions.
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Old 03-24-2005, 12:26 PM
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dundirtcheap

I guess I forgot to include, I also have a large journal crank, and bearings, for the large journal 327. I didnt know the rods were the same length. Guess I can use the 350 rods I currently have, and buy some 327 pistons. TY for the help guys........Anyone have any info on where I can purchase some quality pistons for a minimal price?
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Old 03-24-2005, 12:38 PM
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You'll enjoy trying to hook up the 350 more than the 327. When the track get's sticky, everyone with 355's, 377's, 388's, 383's and 406's are gonna leave ya behind. You better pray for the slick!

I'd build a 355 first. Unless you are on two barrals. Then a 331 is okay if you'll turn it 9600. By that time, it's expensive again.
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