There ported 853's aprox 65cc chambers. Ls2 guts in motor. I run 35 total NA all in by 2800. I was headed out last fri but the car killed the alt just after I pulled in gate so I didn't spray it any barely made any NA passes
1995 S10 LSX powered 11.58@116 NA 3260lbs glide,373's, and 28's 2002 tahoe lowered,tinted,hid's,billet,22's just a daily driver
I would run a #8 plug with 110 gas at around 24-25 deg.
I just ran my carb 383 on a 58N jet and 53F on a zex plate with 110 gas at 25 deg and the afr was 12.2:1. The timing was boarder line. I am pulling a few more to be safe next time and going up from there. My motor is 13:1 cr.
Play it really safe at first. Pull a little more....
__________________ 04 chevy 2500 ccsb 4x4.
57 Belair 4 Dr sedan (old man car).
59 Apache stepside (beater truck).
I run 31 degrees total and pull 8 degrees for 150 shot running half and half 110 and 93 fuel. I run autolite plugs. I have a safe tune that has given me zero problems. No peppering of the plugs ever. I put as many as 7 - 9 runs out a night or day. I have a stock Ly6 engine with cam, valvesprings and hardened pushrods.
__________________ 1979 fairmont ... 6.0 with a few mods N/A.