ssanto

Hi,

New to the LS game... I've been doing road race carbureted SBCs for a few years and always ended up the distributor locked out at around 38 degrees. I understand that LS motors require significantly less timing. But that carbed LS motors like a bit more than EFI ones.

My build (in a road racing stock car):
416 LS3
11.5:1 compression
Ported LS3 823 heads
243/258 @ 0.050, 629/621 lift, 109.5 LSA
Edelbrock Super Victor 4150 intake
Pro Systems 1000 CFM custom carburetor

100 octane fuel

Not running a MAP sensor.

My cam guy gave me a good set of baseline instructions for the timing on this LS3:

• CRANK 0-500 RPM 17*
• IDLE 500-1500 RPM 38*
• TRANSITION 1500-2200 RPM 34*
• 2200- TO MAX RPM START AT 28* AND GO FROM THERE

Thoughts? Suggestions?


Thanks,
Sal

Mark Anderson

Look in the sticky section, a lot of good info there. What you show is too much down low and probably not enough up high. The high is a safe starting point and tune from there. Your low rpm timing is too much IMO. 12-14 cranking, What ever makes it happy at idle, then ramp up to all in at 2200.

LilJayV10

iTrader: (39)

Whatever it wants to be honest.

but I'd take 20 degrees out of 500-1500. You are gonna be way past MBT.