98TAauto

iTrader: (2)

im not a bottom end expert here. Whats the major difference in the 346 and 347? Whats done to make a 346 into a 347?

probably a stupid question.. I have some ideas why, but im not 100% certain...

nspr8td lt1

346 is a stock crank, ls1, the 347 is an aftermarket crank ls1. both can have aftermarket pistons/rods.

the stock crank has been proven to 800hp.

jrp

iTrader: (16)

a basic hone of .007 from a 3.898 stocke bore. or .005 if you want to calll the stock bore 3.90

jrp

iTrader: (16)

you are incorrect.

the crank is still 3.622 irregardless of stock or aftermarket.

jrp

iTrader: (16)

oh, and i've got a forged 347; 3.905 bore x stock treated 3.622 stroke

98TAauto

iTrader: (2)

what about knife edging the stock crank? I know that needs to be rebalanced, but would that still be considered a 346 right?

thanks for the info btw

777

iTrader: (21)

i agree with jerami, but the stock crank has been proven far past this...harlan was running a stock crank when he went well into the 8's i'd say he had over 1000hp...i've yet to hear of someone breaking a stock crank...not that it isn't possible or not that anyone hasn't done it....i just haven't come along one yet..

slow ride

Hey is that stock crank cast or forged?

rons 00z

iTrader: (10)

cast crank

Richiec77

iTrader: (3)

jrp maybe I've been in la la land, but is the motor done and in the car?? PLeas dont' search button me.....

jmX

Displacement is displacement. Knife edging a crank isnt going to change displacement.

CAT3

iTrader: (9)

98TAtuo, to add to jmx, displacement changes with Stroke and /or bore. By that, either bore the block larger (sometimes needing to be resleeved) or change stroke, either less DeStroking like old 69' 302 Z28, or SuperStroking like 4.125" stroke crank, any other available, as well as offset grinding.
If you swap the stock crank for a 4" and clean up the cylinders to a 3.905 bore, you have your 382 Stroker. However, you overbore 4.095 (4.110 sleeved) and keep the stock crank you also have a 382 All-Bore. Same basic discplacement and two different combos, one torquey low rpm, and one hp and high rpm.

jrp

iTrader: (16)

in the car yes , finished, no . just need to hook up the rest of the wireharnes, install the clutch hydraulics, and a few odds and ends.

trust me, when its done you'll know

98TAauto

iTrader: (2)

cat, thanks for the info..

Im just looking to see what can be done to a 346 to get as much power outta the bottom end as possible, without buying a whole assembled 382 or etc setup.

z98

Try 1200+ HP!