Plus with 4000+ lbs I looking for torque!This combo i hoping for 460-470hp and 490-500ft torque!I know 4in stroke is big but i feel it still has small bore and under 400 cubes!Thats why i am staying on small side on cam,rather be under than over!
You asked what affect the longer stoke has... The difference in stroke length is a hair over 20% longer. Using just that figure, if you were looking at a cam for a 318 with an intake duration at .050 around 220°, then the equivolent cam for a 390 would be 264° at .050. Assuming the ports and intake/carb are upped the same percentage. This is an over-generalization, but you can get the idea. Strokers like duration. If you run a cam around 245° to 250° @ .050, you will have torque AND horsepower. If you run much less, you will have torque.
You'll have to let us know how it goes. I think HP-wise it won't make your number with that cam. But the torque will be strong, that's for sure.
