Last month my 318 magnum ran 13.5@102. I changed the vac carb to a double pumper because the 60' was 2.0. It worked and went 1.88 60' and 13.19@1o4 first pass. I also made a ram air air cleaner and that got a 13.05@105 so I pulled the air filter and power steering belt and got 12.998@ 106.3.

Its a stock 98 318, with a little porting, comp xr265 roller, air gap intake, 750 dp, headers, 2.5" exhaust, 3000 stall, 727, 4.10 gear with 28" dot slick.

At 6pm sat they let us do some free lapping on the road course. I put my street tires on which are 295/50R15 on back and 275/50R15 on the front.
I burned the brakes up in 3 laps the first time out. I let it cool and did 7 or 8 laps and didn't use the brakes hard. Car handles extremely well but I think I broke the drag shocks. I want to put a front sway bar on it and good shocks and do it again. I could hit 100mph on both straights. I saw my shift light in 2nd on another stretch in the middle so thats around 80 mph. I ran it as a 2barrel because low speed in 2nd and flooring it would bog. I basically ran 2nd gear except on the straights.

Being a fellow 318 racer I'm interested in your progress. What was the temp & track conditions when you recorded these improvements. Also the weight of the car if I may ask. Thanks

Good info. Have you tried a carb spacer? Also just FYI, mine likes a fresh set of plugs. May be albe to use that to help you on the hot days stay in the 12.90 class. I tried a .040 gap & the car didn't like it. Went right back to the .032.

I would like to see what that would do with a 650 double pumper. May help your low end.