1998 Tahoe W/Rebuilt Engine & Tranny W/PCM4Less Tune - Update suggestions

[Fast355]

Hey fellas,
I have finished rebuilding the engine in my 1998 Tahoe, and I would like to get some suggestions on updating my PCMForless Tune. I have a JET programmer, and have been reading the forums, but would like to get some suggestions from y'all with more experience than I have.


The engine component specifications are: Comp Cams 212/218 .488/.495 112 LSA camshaft, Sealed Power lifters, stock pistons and sealed power rings, Comp 7808-16 (Magnum) .080" wall tube pushrods, Melling 10550 oil pump and tac weld pick up, Howards 98215 single springs, ARP rod bolts & resized connecting rods, new SCAT crankshaft & bearings, Sealed power timing chain Set to 4' advanced, 3 angle valve job W new umbrella seals, resurfaced cylinder heads, new cam bearings, new oil galley plugs & freeze plugs. New spider injector assembly.


The transmission is a new GM replacement with a 2,000 RPM Circle-D stall converter.


To help, I can output my current tune here in a PDF. The biggest thing in my mind is wondering if I have to tune for the 4' advanced cam timing chain setup?


Thanks!

Comp Cams are almost always ground 4* advance for a small block chevrolet. Are you saying you advanced it another 4* for 8* total advance. 104 *ICL. Given the results from using various cams, I feel you would see better results only running the 4* ground in advance. That would be the cam on a 108 ICL.

That being said nothing out of the ordinary needs to be done for the cam advance. Just set the distributor CMR within spec and start the actual tuning. The actual ignition timing is controlled by the tone ring on the crank and the crank sensor. The cam could be 20* advanced and the PCM could care less, provided the distributor was 20* retarded so that the Cam/Crank correlation angle was Zero.