Quote: I have a Coan 8" 5500 and 4.56's......Goal is 8.80-8.90's
-------------------- "Me and my Arrow"... 6.078 @ 113.56 in the 1/8 9.582 @ 140.82 in the 1/4 so far...still planning on a 500" Best Machine bullet
This is how I look at it. You want to go 0.70 seconds quicker and at that ET it will require about 140hp more to get there. Put a 4.250" crank in it (511 CID) and stepping up from the 446 CID is worth around 1.3 hp/CID x 65 = 85hp. Up the compression ratio from 12.0? to 13.5 is worth 1.5% x 650 = 10 hp. A better roller cam should be worth another 30hp. That leaves 15 more hp to find. Some additional head porting might be in order. I would also like to see some 2-1/8" headers on it. The bigger motor will need your torque converter tightened up as the stall will go up with all that torque.
Looking at it another way, my engine/car at 3160 lbs went 9.32 in 500 ft DA air at Norwalk last weekend. Your's is 800 lbs less. So my combo would put you at 8.50s in that air. Good flowing heads are important (350 cfm or more).
