New motor won't crank
 

Ok, this isn't on my car. Its a buddy of mines that we've been working on. Its a forged 346 with a stock crank, Scat rods, and Mahle pistons. It has a TRex cam and a set of stage 2 5.7 heads.

We moved to battery to the back and have a power line going to the starter and to the fuse block. All I can get it to do is just slightly turn the motor. Mostly I'm getting a click when I turn the key. Starter is good cause I thought that may be it, so I swapped the stocker for a Powermaster that I had for my car. Battery is fine also, I swapped out the new one out of my Z06 to see if that would help and got the same result. Any Ideas??? I have a feeling that something may be draining the crap out of the power whenever I try to turn it over. I'm reading about 12.5 volts when the key is on the on position, and about 8 or 9 when I try to start it.

If you guys have any suggestions that would be great!

Thanks,
Tre

just out of curiosity....have you tried to turn the crank manually?....did you see after this block was put together if it would rotate or not?

What size power and ground line is being used? To small of of a line will cause a massive amount of resistance which will cut down the power output of the starter.

This just happened to me, make sure the black ground from the battery is ground on the block above the starter and that the black wire on the starter is secured with a nut along with the red wire secured next to it on the starter.

If its a 98 or 98 heads make sure the coil pack wiring harness is not backwards. Heres a diagram http://www.ls2.com/boggs/torques/ign...ringcolors.htm.

Other things that can be causing this is a faulty crank sensor which is right by the starter and possibly VATS if your security light stays on when the key is turned.