[zrayr]

Stock timing on my Hi-Po 289 engine is 40 degrees BTDC, stock compression is 10.0:1. With the vintage Paxton I've found it necessary to reduce the timing by just 7 degrees to 33 BTDC to eliminate detonation. In the winter, or when the airt temp is under 70 degrees, I can get by with 36 total timing advance.

Z.