Heads for a Magnum Stroker Engine

The ATK is forged crank, pistons and rods. The pistons are a 23cc dish which doesn't help for compression
We haven't taken the 340 that is in the car at the moment apart at all since we bought it. Some of the lifters seem weak so they will be replaced before next time out, no idea what the cam is or the compression ratio or even the valve size. Its a 750 DP carb with 1 3/4" headers into a 3" exhaust.
The 28 x 9 tyres are on 7" rims and this is the biggest wheel and tyre that fits without starting to cut things about.
The 390 stroker kit from Scat we are looking at is forged pistons, rods and crank. Pistons are flat top with 4.7cc That will give over 12.1 compression with the victor heads which require 1 7/8" headers, it will become a strip only car then. At the moment, with a change of tyres, it is street legal with a valid mot (inspection) still in place