Re: dyno results from 406sbc
If it makes you feel any better, you are definitely on the right track as far as putting a good engine combo together goes. Here is a little story of somebody who is not on the right track and who probably would not beleive you when you told him what you built. Back at my old job when I was going to college, I got along all right with one of our HVAC guys cause he was a car buff. But he was one of those guys that didnt know a lot, but really really thought he did and was COMPLETELY stuck in his ways.
He was telling me about the 454 going together for his drag camaro that he would also drive on the street too. I asked him what the buildup was like and he told me it was a 468 with ported stock heads but he didnt know what casting they were, 12.5:1 compression, a solid roller camshaft(he did not know those specs either but the lift was around .680 he said) strip dominator intake, and a 1050 dominator carb. I though hey, that sounds real healthy if its done right. Are you trying to wring 700 horses out of that thing? He said no, him and his builder are working together on this motor trying to get 500 torque and 500 horsepower out of it if possible. And since someone else is basically putting it together, thats why he didnt know the specs on a lot. I tried to tell him that he is either gonna end up with way more motor than he bargained for, or something is up cause it sounds like they are way overdoing this motor(cam and compression wise) if all they seek is around 500 horses.
I provided some suggestions of what should meet his goal in a much milder package and he told me I was nuts cause they have been working with this same core motor for a while and have not yet come close. By the way, he wanted this power at the crank, not the back wheels. If it were 500/500 on a chassis dyno, I wouldnt have spoken up cause it makes more sense. I told him about the motor in my uncles el camino that was for sale at the time. It was a 468 with 12:1 comp, dart pro 1 aluminum heads and a solid roller cam and that this motor put 550 down on a chassis dyno and it should be nearing 700 at the crank. He just said that I must be crazy. It would take an alcohol burner with much more comp, more cubes and more carb to make 700 horses. I just let it go at that. Later on he came back and happily declared that they got a little over 500 horses. I guess they must have had a set of peanut ports with a bad port job, totally the wrong cam, and a terrible carb and ignition tuneup. He also finished it with a 4.11 gear and 3500 converter and is trying for mid 11 second timeslips but no faster than 11.50 cause he does not want to cage it.
He would tell you that your completely full of it if you told him you made basically the same power out of a small block 408 with almost two points less of compression. Thats definitely a lot better motor you have there than what many people build and that cause it sounds to have been done well for its purpose and everything in the combo is matched nice. Its good to the point that many people would not beleive you unless they saw it.......and then they still wouldnt beleive you. Good job and good luck with that motor.