Will new pistons cause balance problems - Team Camaro Tech
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post #1 of 5 (permalink) Old Jul 11th, 03, 12:42 PM Thread Starter
 
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Building up a 355, weighed original dished piston found to be 752grams all others were within 5g, new flat top hypereutectics are 716g will the 36g/31g difference screw the balance up relative to crank? or does the piston & rod assembleys just all have to match each other?
due to mild cam will not be reved pasr 4750.
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post #2 of 5 (permalink) Old Jul 11th, 03, 01:23 PM
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IMO on a budget build as long as the new pistons are lighter not much of a problem.

67 Plum Mist Met. 408 TH350 3.08 posi
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post #3 of 5 (permalink) Old Jul 11th, 03, 02:38 PM
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Bill
 
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Steady,
That is about the same difference as there is between a stock 350 piston and a stock 305 piston and GM definitely balances the crankshafts differently. If it was 10 grams or so, I would say dont worry about it , but 30 ... I vote for a rebalance.

Bill Koustenis
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Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #4 of 5 (permalink) Old Jul 11th, 03, 07:36 PM
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I second that. Even 10 is pushing it.

-dnult

Dave
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68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #5 of 5 (permalink) Old Jul 12th, 03, 02:15 AM
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I really would not worry. I overbalance my race motors to 52%. By this, I mean that the bobweight total is set to 52% instead of 50%. A 30-gram lighter piston will not hurt a thing. For laughs, take a look at the OEM piston/rod/crank combos that Chevy has used. You will find a huge variance in pistons that were used with the exact same crank, with no attention paid to the weight differences. No big deal!

Oldani Motorsports

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