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Old 01-16-2003, 12:43 PM
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Post rod length

Im currently in the process of collecting parts for a 383 that i will soon be building. But im pondering on whether 5.565, 5.7 and 6.0 inch rods i should go with. Is there a differnce in compression/performance? This is going to be a daily driver and a lot of late night races, so any info from you guys would help.

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Old 01-16-2003, 01:40 PM
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Forget about the short rods. If cost is a big issue, find some used 5.7" rods. If not, get aftermarket 6" rods - the difference in price between the pistons will be negligible. The 6" rods should, theoretically, give you a bit more power (longer dwell at TDC, less friction on cylinder walls).
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Old 01-16-2003, 06:04 PM
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opinions and experiences do vary, but generally 6" rods tend to have clearance problems with the block... worth looking into, b/c it means more machine work. the money might be better spent on other parts. good luck, there are a lot of posts about conrods around here, good to take a look at. just can't find them at the moment - do a search. good luck w/ the Chev.
-z-
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Old 01-16-2003, 06:14 PM
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I just built a 6 inch rod 400. The only rod clearance problem was with the bearing end of the rod. It was only due to the profile of the rod not the length. I would go with the 6 inch. The clearance will not much different with a 5.7. With a 350 block you will probably have to do some clearancing on the cylinder and pan rail.

chris
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Old 01-16-2003, 07:38 PM
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Don't forget to check for clearance between the cam and the rods. This is a common problem on strokers with wild cams.
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Old 01-16-2003, 08:13 PM
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[quote]Originally posted by xtreme off-road:
<strong>Don't forget to check for clearance between the cam and the rods. This is a common problem on strokers with wild cams.</strong><hr></blockquote>

Yup, Had to do a bit of grinding on my rods.
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Old 01-22-2003, 02:32 PM
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It looks like to me that a 6" rod in the 400 sbc pushes the piston pin up into the oil ring lands. Durability issues?
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Old 01-22-2003, 03:29 PM
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[quote]Originally posted by nova69:
<strong>It looks like to me that a 6" rod in the 400 sbc pushes the piston pin up into the oil ring lands. Durability issues?</strong><hr></blockquote>

Yes it does. Havent heard of any problems with durabilty. This is my first shot with em.

Chris
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Old 01-22-2003, 03:37 PM
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Okay got a question... when you put long rods on an engine don't you need to get the whole thing balanced (even though you should anyway) and aren't new pistons that have the pin higher up (to bring the top of the piston down) a must?
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Old 01-22-2003, 06:23 PM
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I have recently read a tech article about the relative merits of buying 6" v. 5.7" rods in SBC. The conclusion was that there is a theoretical gain that was virtually unproven on the dyno. The 6" rods are going to be much more costly than a set of reconditioned 5.7's.

A 383 must be internally balance no matter how you build it. You need to send the entire rotating assembly to the shop. Yes, when you buy pistons, you have to specify the 5.7 rod length. If you didn't, you would raise the piston out of the hole.

[ January 22, 2003: Message edited by: F-1Rodder ]</p>
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