Ran the 250 tonight with the 1.94 open chambered lump head (70 CC). Made another 5 hp. Our weather is crap right now, with high humidity and changing temps. It also moved the rpm range slightly higher, now the dyno is set for 6500 rpm. Peak is now 6100-6200 rpm.
A 390 Holley will flow 420+ cfm also, It is now a limiting factor. On goes the 600 holley. Tom
