In tunercat "spark advance vs rpm vs load" table, LV8 ends at 208, yet my scan data shows values up to around 220.

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'87 Formula WS6 - ZZ4 Crate TPI, Scroggin-Dickey ported heads, LT4 hot cam, 1.6RR, Accel runners, Accel base, ported plenum, Edelbrock 58mm TB, Crane Fireball ignition, SLP cold air, SLP 1 5/8 headers, !cat, Summit exhaust cutout, Walbro 255, Koni yellows, Hotchkis panhard & LCA's, 9 bolt w/3.27's.

 

LV8 can go all the way up to 255, but I guess GM didn't see the point in taking the spark table any higher since you'd have to be WOT to even get to 200 or so. Sure makes it easy to change the spark advance for WOT conditions (not PE, just 100% throttle) with my new 355 since I go above 200 right away and stay above it until I'm above 5000 rpm. At this point, I'm above the highest RPM row (4800 rpm) on the spark advance table and only need to adjust the last 2 values on the last row. With my old 305, I never hit anything above 200 LV8, and the path the engine took while going up the revband while at WOT was quite funky, sort-of a sideways bell-shaped curve.

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Greg Westphal
'87 IROC 355TPI/A4