I am trying to help my friend with his 414 LS1. Its a 6.0L block with LS7 heads and a GMPP intake. I would have to get the cam specs from him. We are going to run a SD tune. We tried for a couple of hours to get it to start and idle and all it wanted to do was pop out of the intake and exhaust. I tried idle timing from 14* all the way up to 32*. The engine was ran on the dyno with a carb before being shipped out and they told us they ran 28* at idle. I tried adding to the cranking VE, RAF and idle spark tables. I also tried playing with the abs timing in the vcm controls. Did I just skip something in the tune?? Thanks for any help.
-Joe
edit: cam specs are 249/261 110 LSA hydarulic