evol_crx_si

does anyone know if you can use a LS crank with GSR block rods and pistons? Like will the piston clean the block deck or come above it please someone let me know if they have done something like this before and has any info on that would help me before i start my project

99B16Si

u can use an LS crank but will have to use LS sized rods also as the are slightly shorter than gsr rods. if u use gsr rods the piston would come up above the deck unless u used an aftermarket piston with an offset wrist pin

hybrid ek

dave is right. I would suggest staying with the gsr crank because it has a better r/s ratio and can rev higher safer.

4dorteg

talk to mtber about this!

99B16Si

the rod to stroke ratio of the ls is not the problem. 1.53 in an LS vs. 1.58 in a gsr is very little difference. the major difference between the 2 is that a gsr has a crank girdle for higher rpm stability and also has stronger rod bolts. just upgrade to arp's and the rod bolts wont even be an issue

Derka

doesnt the crank hit the oil squiters, forceing you to remove them?

mtber

To answer your question:
Yes you can run an ls crank & rod assembly in a GSR block.
You will need to tripple check the oil squirter clearance possible even do some minor filing.

You should definently use arp rod bolts for the b18a/b & have them professionaly installed as per the instructions on the arp manual.

Concerning R/S ratio:

D15B2 - 1.59:1
D16A1/A6 - 1.52:1
B16A - 1.74:1
B17A1 - 1.68:1
B18A/B - 1.54:1
B18C - 1.58:1
B20B/Z - 1.54:1
H22A - 1.58:1

You will be fine running an ls/crank & rods as long as you don't plan on running 24 hours of sebring at 8-9k

Note: Depending on what pistons you use, your machinist will have to mill 1mm out of each side of your pistons to allow the ls rods to fit properly.

Good Luck,
John