Post your 13 sec combos
Blew up a lifter in my 413 and sent metal through it. now stock 383 with ported 906 heads, 474 purple cam ,torker intake and cheap roller rockers. So far 2 runs went from a 13.34@102 bumped up timing then went 13.11@103.
413 ran 12.38 in cool weather with stealth heads ,383 ran this in 85° 2,000DA.