prairiehotrodder wrote:I have a hard job believing you on the compression F-bird. I have personally had a 377 SBC with 11.75 CR that loved pump premium 92 and lasted 5 years of hard racing and street driving. Aluminum heads and the right cam seemed to make the difference.
BBC will tolerate more than an average SBC, DV targets 10.8 to 11.2 on his street builds and dynos them on 87 octane to prove the point, 92/93 would be preferred in the car due to heat.
Here is a real world example of whyI think Fbird is wrong on his gear theory.
2 virtually identical builds, both 421 SBC dynoed 20 horse different both 3150+ lbs both run glides, same converter, same shocks, mono leafs and caltrack bars.
So why is the heavier under powered car with less gear, both trans and rear 2 tenths and over 2 mph faster?
1st car in this video...https://www.youtube.com/watch?v=TTi71uG5BL8
VS this carhttps://www.youtube.com/watch?v=6RgKOCo0GhU
Watch the end when it replays in slowmo...