gennex

iTrader: (1)

i have an lsx block with a k1 3.9 stroke crank, anyone sell and off the shelf piston for the 6.125 or 6.100 rods, i probably will be going with k1 6.098 rods for the build but need a piston.

thanks

Thirian24

Im getting my short block assembled, I'm using forged ls7 crank, K1 6.125 rods and wiesco 2618 forged pistons.

Hope that may help.

Dustin

gennex

iTrader: (1)

no offense but that doesnt help at all... piston part number or something atleast.

Thirian24

Well sorry about that, I work in the oilfield and I don't curently have my part numbers. What bore size, I'll try and look it up.

LS1RedZ

iTrader: (19)

I'd go Wiseco or Diamond. How are those K-1 cranks? I have their rods in my motor and they are supposed to be bad ***.

gennex

iTrader: (1)

yea im going with the k1 rod, just need to find a pistons, any bore with work, i have a new lsx,

383camaroz28

iTrader: (22)

What kinda power can the k1's hold? They better then compstars?

LSXSeven

iTrader: (1)

Dustin, I would talk to whoever is going to balance your assembly about using the ls7 crank with those heavier rods and pistons. The bobweight will be much higher than with the titanium rods. you will probably have to add a lot of mallory $$$


Gennex, you will probably have an easier time finding OTS pistons for a 4.0 stroke crank. Are you dead set on using the 3.9 crank. I am looking to purchase one and could possibly work a trade with you for a 4.0 crank. I have 3.9 stroke pistons for a ls3 block (4.070) and 6.125 rods. I want that stroke for my build. On an iron block, 4.0 stroke works well. didn't know if you were dead set on 3.9 as well if you had the option

Mike

gennex

iTrader: (1)

mike,

i actually found out some learned some good information, i kept the 3.9 crank, i went with the callies ultra billet rods, 6.125 length and had 0.025" taken off the pistons. everything came out perfect.

additionally i researched those k1 rods and they are not a true billet rod, they are basically the same rod as the callies compstars. 800flywheel hp is what callies rated those rods at, i ran them at 1300 flywheel for over a year and was ok until my boost controller hit 35psi and boom. the pistons looked ok, i actually think the rods just broke.

LSXSeven

iTrader: (1)

I am building a 406 based ls3. It is going to be N/A. It's in a Mazda RX7. I liked the idea of the slightly shorter stroke since I keep hearing about piston skirt wear on the 4.0 stroked aluminum blocks. The guy who is getting me the block has a set of Mahle 4032 pistons setup for 3.9 stroke and 6.125 rods. He has rods as well. The 4032 pistons are lighter and can run tighter piston to bore. Since my car is so light and since I will be road racing it, Lightweight rotating assembly ids my goal. He had a line on a used scat 3.9 crank, but it sold He can get me either a K1 or RPM international crank.

How did your K1 crank mic out. From what I read, they are very similar in quality to the compstar. I think I may have to get one of these new.