can i do this???

batdude8 · Post by **batdude8** » Tue Nov 13, 2007 12:23 am

ok, ive searched and searched... but no answers... i have a g63b (4g63) wideblock, aswell as a 4g64 6bolt crank. can i put that crank (4g64) in the g63b with OE 4g63 rods and pistons. i know if i use the 4g64 bock/crank i have to get custom pistons for the relocation of the piston pin. but im trying to do a "stock" bottom end on my build. that and i have all the parts to assemble my motor now, and if i have to get custom/forged pistons its gonna delay my build for a while. thanks for the help. Dan

Post by **DJpowerHaus** » Tue Nov 13, 2007 4:26 pm

The best thing to do when pondering this is to see who sells what and what the difference is...

http://www.rpmrons.com/WisecoMits.html

Eclipse / Eagle Talon 88-92 4G63 2.0 Ltr - 21mm Pin
K559M85 85.00 / 3.346 Std. 3.465 5.905 1.378 47 -17 .042 .000 9.015 8.3:1 .827 8500xx

Eclipse/ Eagle Talon 88-92 4G63 w/ 4G64 Stroker Crank - 21mm Pin
K571M85 85.00 / 3.346 Std. 3.937 5.905 1.130 47 -21 .042 .012- 9.015 8.8-9.0 .827 8500xx

The they are different. Obviously stroke, but also compression ratio and CCs, but mainly "deck clearance" which is .000 vs .012-. Not sure what that means but regardless.. it is a difference between their 46G3 with 88mm stroke crank and 4G63 with 100mm stroke crank part numbers.

Post by **DJpowerHaus** » Tue Nov 13, 2007 4:48 pm

Sticking with the "6 bolt" variety parts makes it so you dont have to worry about that.

Plus I think the G63B with the different bore and stroke must have been from the 70s and might have been chain drive.. not sure. Not really worth worrying about.

Bill Hincher · Post by **Bill Hincher** » Tue Nov 13, 2007 7:27 pm

"deck clearance" refers to how high the piston crown raise in the block at TDC, you want about 20 to 30 thousands "deck clearance" because at high RPM's the piston can 'tap' the cylinder head if rod bearing clearance or wrist pin clearance to a little bit off

I seen that there in a book