350 and 305 piston rods - Team Camaro Tech
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post #1 of 8 (permalink) Old Jan 27th, 01, 02:28 PM Thread Starter
Join Date: Jan 2001
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Hello, I was wondering if I could use the piston rods out of a 305 in a 350?? I am just building the 350 to stock specs. And could I use the crankshaft out of the 305 in a 350 too?

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post #2 of 8 (permalink) Old Jan 27th, 01, 02:52 PM
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Yes the rods are the same. The crank is the same also as long as they have the same style rear seal (one piece or two piece). The difference betweena 305 and 350 is the bore size.

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[This message has been edited by squarles (edited 01-27-2001).]
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post #3 of 8 (permalink) Old Jan 27th, 01, 03:04 PM
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If you use a 305 crank in a 350 it needs to be reballanced.

'69 RS/SS396 pro street
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post #4 of 8 (permalink) Old Jan 27th, 01, 04:33 PM Thread Starter
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Thank you very much. I thought that they were the same, but I just figured that I would make sure.
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post #5 of 8 (permalink) Old Jan 27th, 01, 09:18 PM
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They are dimensionally the same but the factory balance job is different...the 305 is balanced for lighter (smaller bore) pistons (same for the crank)...so you definately need a balance job if using these parts on a 350. Around here balancing costs about $150

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post #6 of 8 (permalink) Old Jan 28th, 01, 03:55 AM
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So in other words, get yourself a 350 crankshaft and leave the 305's for the 305's

69 rallye green X77 Z/28,1967 SS 396 Conv. 1974 c-10 454 swb
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post #7 of 8 (permalink) Old Jan 28th, 01, 06:04 AM Thread Starter
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I was most concerned about the piston rods. Would I have to get them balanced too?? I have the crank, but I need piston rods.
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post #8 of 8 (permalink) Old Jan 28th, 01, 12:02 PM
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You need to have the entire rotating/reciprocating assembly balanced - crank, rods, pistons/pins, damper, flywheel; shop will equalize the weight of the rod/piston/pin sets and make up bob weights to match the equalized weight, then balance the crank with the damper, flywheel, and bob weights attached.

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