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331 vs 347
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[QUOTE]Originally posted by 93PONY: [QB] The top 2 EFI N/A 347's on the site run 10's. One runs a 5.4" rod & the other a 5.315 with 331 pistons. Both make over 440RWHP. Both run VicJr heads & VicEFI intakes with reverse-split custom camshafts, longtubes & 3" exhaust. Both seem to have zero issues with oil control, streetability, cooling, etc, etc. Both have a few thousand miles on the motors. Both go on long cruises without any issues. One car still has all the accessories minus the smog pump. (A/C, PS, etc) Personally, I like the short rod setups. The one drawback to the 331 piston/5.315 rod combo is that the total piston/rod length is .010" shorter than the 347 piston/5.400 rod. So, if the block is 'zero decked', the 5.4/347 combo will be at zero, the 331/5.315 combo will be 'in' the hole .010" & will have slightly less compression unless you use a thinner head gasket or deck the block further....or use custom pistons. [/QB][/QUOTE]
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