Hey guys, i have been trying to find the best plug for my combo and the gusy at my speed shop siad that destroked motors with compression love the autolite 25's. What do you think?
400 block .060 over
3.48 stroke
383 cubic inches
14.5:1 pistons

Blue racer cam 575 lift 310 duration. Not 100% sure on cam cause builder says 330 and the guy i bought it from says 310. :(

Double hump heads 2.02 valves cut in gasket matched to intake
Weiand team G intake
Holley 850 double Pumper Jets are 80 up front 85 in back
Run leaded Cam 2 or VP C14 Gas
Th350 with 3800 stall
12 bolt 4.56 gears

MSD 6AL with MSD billit distributor and MSD wires.

I also have a 200 shot of NOS that is goin on in the spring. How much colder of a plug should i go, and what about timing. Builder sayd 37.
Thanks guys
Ed

ttt