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347 ci ???

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Old Jan 17, 2012 | 08:11 PM
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Default 347 ci ???
What all is needed to be done to make a 346 block into a 347??
Thanks for any advise
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Old Jan 17, 2012 | 08:36 PM
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0ne cubic inch=good hone job.
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Old Jan 17, 2012 | 08:41 PM
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Yea y would you want to? Some people call the ls1 a 346 and some call a 347, depends who you talk to...
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Old Jan 17, 2012 | 08:43 PM
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Thanks, Just trying to figure out what to do with the bare block im about to buy...
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Old Jan 17, 2012 | 11:47 PM
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345.69 is a stock ls1 ci. taking the bore from 3.898 to 3.905 will net about 1 more ci yielding the 347...
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Old Jan 18, 2012 | 12:05 AM
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Originally Posted by pauls99z28
What all is needed to be done to make a 346 block into a 347??
Thanks for any advise
Yea 3.905 bore gives you a 347. Not like you are going to feel a difference but most everyone that builds a "stock ci" engine builds a 347 because there is alot more piston variations available.

Originally Posted by wildcamaro
Yea y would you want to? Some people call the ls1 a 346 and some call a 347, depends who you talk to...
Because when using an LS1 block the only place to go from there is bore the hell out of it making the cylinder walls thin, add a stroker crank for a 383 which also adds to machine work plus a new crank, or you mid sleeve and the cost shoots way up. Alot can be done with a 347.
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Old Jan 18, 2012 | 12:10 AM
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well practically peaking a 346 and 347 are exactly same other then miniscule amount of bore over or maybe piston dish/dome...other than that they arent any diffferent if you equip them with the same parts...you might get 2 extra hp lol
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Old Jan 18, 2012 | 08:20 AM
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Thanks everyone for the feedback...I have a better understanding of what to do now.
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