Completely missed those............embarrassed!

This may be an issue:
User Note: The GM Performance Parts LS 376/520 crate engine (19171225) comes equipped with the LS “ASA”
Cam (12480110) which is an aggressive high performance camshaft that may cause slight surging below 2500 rpm
under light load. This should be considered a normal functioning occurrence given the aggressive nature of the LS
ASA Cam. This surging can be avoided by increasing either the rpm or throttle of the engine at the same given
velocity. Under full throttle usage, you should not experience any surging when using the GMPP ignition control
system (19171130) and the recommended LS376/515 calibration.

That is just above cruising rpm for my car.......

HMMM that is a concern i wonder if anyone else that has actually used this engine can chime in. I wanted to run a 5 speed to keep the RPM's low for high way cruising.

sending this back up to see if anyone has used this motor?

I have this engine in my 67 Camaro - Very streetable! The LS control module has 6 preset timing curves and also the option to hook it up to a computer and make your own custom curve. It performs as advertised... I run 12" drag radials and it will burn them down...

Change your tire size or rear gear ratio.... if you experience too much surging and can't stand it.


And the surging was in light load.... That would then depend on what a light load is -- i.e., the weight of your car etc...

That sounds like a Holley Street Avenger :hairpullout:

I agree, i am considering ths for my 59 vette with RS600 and 3.73 gear.