On board speedo read 53mph with a hot 377" 9.7:1 comp small-block.
Went to 402" with 10:1 and similar build. Both running well tuned 750 Holley double pump and Edelbrock dual planes. Now I only get 50mph on good days.
What do you think a good port and polish would add to the Big Block...5-10 MPH?
Also got a roller cam with 232/244 dur and .568" lift on 112lobe center. (10degree more than I had) Maybe another 5mph?
Too optomistic, right?