leadfoot78

Ok there seems to be a few people in the FI with real experience so that's why I'm asking here. I just got my LS crank and there are alot of numbers and letters on it, and I'm not 100% sure about all of them. Before you say it, I do have a Helms manual and I have looked in it and not every figure on the crank is identified.
Is the "4" on the pulley end of the crank the number of the main jurnal or is it just a random number like the "7" in the middle of the crank. The "B" with "1" under it, I'm pretty sure the B is for the rod journal size, is the "1" the main jurnal size or is it the four under it?? Here is a fat *** pic to help you out!

by the way my block stamp is B-C-B-C-B.

Flamenco-T

your Main Bearing color code would be, from crank pulley to flywheel

B1 C2 B2 C2 B2

Rod would be (the number depends on your rod ends)

B B B B

hope this helps

stan

leadfoot78

So the first main bearing is B1 not B4?? Does anyone know what all the other numbers mean??? thanx for the help Flamenco

Flamenco-T

it is B1, the other number that are casted are usually just to denote the crank for ID purpose only..the actualy clearance and specs are etched in.

stan

leadfoot78

Can you tell from those castings if it's a LS crank or not?

99B16Si

even tho u got the color codes now make sure u still plasigauge every bearing to make sure the clearances are where they need to be, theres nothin much worse that a spun bearing