Recently I completed a cam/head swap. Out came a regroung LT1 cam and TF heads and in went a ZZ9 cam and AFR190 heads.

With the LT1 cam, I installed the cam at 4 degrees advanced. The ZZ9 cam is installed straight up.

Here, is my question:
The LT1 cam liked about 8* static timing. The ZZ9 cam likes 14* static timing!!! At 8 degrees the ZZ9 cam will stall out or run very rough.

Do I have the distributor installed wrong?
The rotor points toward the #5 intake vavle when at firing TDC.

Also, while setting the static timing with the ecm distributor wire unplugged, my scanner is reading 31* timing!!!! How can this be?????


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'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 2400 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(48psi), K&N filters, Hotchkis lowering springs, Car-Pro custom chip, Lay Ind. ram air kit, 265/45R16 Kumho V700 tires.
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter.
313.7Hp & 320.6ft-lbf, 13.55sec @ 105.1mph

 

Doc this is just a guess...but i think yer in diagnostic mode with yer scanner...with my OTC and any 87 Pontiac you must program the scanner for road test(normal mode).Just hooking on the scanner without choosing road test mode puts the computer into diagnostic mode (1000rpm idle speed....full timing advance)