My A12GX; GX cam, ported head, header, 2 inch exhaust, FCR 39mm flat slides, standard electronic distributor, 10-1 compression made 73whp. This cost a shade over $1000

Same set up as above but with 460 lift 286 duration cam made a hair over 80whp. Cost $1278

A15: 1508cc, GX head ported, reduced neck valves 37/30mm, 278 duration .420 lift cam, header, 39mm flat slides, Arias forged Pistons, 11-1 compression, standard electronic distributor, 2 inch exhaust. Estimated to be about 107 to 110whp. I'll know for sure next month when I actually put it on a dyno. Cost $3240

You can see the dollar to power output, starts out slow and then round the 80-85 whp takes of rapidly.

As published somewhere on here Dave Pattons A15 powered 1200 race car made a shade over 150hp at the wheels.

Tom