38 is from
Basic Startup and Adjustment and Ignition Tuning for Maximum Performance taken directly from the
Mopar Performance Small Block V-8 Electronic Ignition Kit instruction sheet
56 BTDC all in.
http://www.mopar1.us/engine2.htmlEngine Heads Timing Specification
A Production - Pre '89 (Iron) 35 BTDC
A Production - '89 & Newer (Iron) 32 BTDC
A W2 (Iron) 35 BTDC
A W5 (Alum.) 35 BTDC
B/RB Production (Iron) 38 BTDC
B/RB Stage I, II, III, IV, V (Iron or Alum) 38 BTDC
B/RB Indy (Alum) 35 BTDC
B/RB B1 (Alum) Under 475 cu. in. 37-39 BTDC
B/RB B1 (Alum) Over 475 cu. in., Under 15.0:1 Ratio 36-38 BTDC
B/RB B1 (Alum) Over 475 cu. in., Over 15.0:1 Ratio 34-36 BTDC
B/RB B1 TS 34 BTDC
Hemi All (Iron or Alum) 35 BTDC In my experience some motors will tolerate that Much vacuum advance and others will not. IMO it is best to break the motor in on the conservatives side and then start experimenting
