Last time with W5s it was 555hp ,460tq.

Today with Chapman W9s it made 606hp, 490tq.

Same bottom end, camshaft and carb. Peak power and torque were 500rpm higher with the W9s.

How does this sound? 422" X block.

69 340 swinger streetcar 8.13 1/8th w/1.90 60ft w/ 3.55s 69 422W9 Dart stock suspension,5.27 on 275/60s,single bar plate