W2 408 build
Hello rmchrgr,
Dyno sheets all say standard for correction factor. Sounds like you have a very nice combination yourself. The only comment I can really make with substance behind the possible reasons for difference in H.P. are the carb, and attention to detail. I do NOT mean your engine was not built with attention to detail, only that this engine was built by a gentleman who builds stock eliminator and Superstock engines and has very successful race cars. Much of the power from engines like he builds is from exact tolerances and such. These guys need to make huge power using engine building techniques I don't claim to know anything about. While engine was on his dyno he put on a proven Quick Fuel Q-850 as he felt the 950 might be to large. Much to both of our surprise the hp was down by 20 even with jetting changes.
Thanks. I guess carbs can make a big difference sometimes.
My combo made 500.2 @ 6,000 rpm so a little higher up than yours. I saw my uncorrected hp flash over 520 hp on a few dyno pulls. It was a decent day out but the vapor pressure was a little high.
Let's say the Victor gives me 15 hp and the oil pump maybe 5-7, I guess the 950 could have given me 20 hp then I'd be pretty close to where you are. My headers are the same as yours, I think they work good. The guy that did my heads did not see any reason to go to a bigger primary tube.
Your torque curve looks similar to mine as well in how flat it is though you make way more than me. My peak torque was 500 ft lbs @ 4,800 rpm. However, it never went below 430 ft lbs. from about 3,500 rpm to 6,000 rpm. That's big block torque!
We spun mine up to 6,300 rpm but the returns started diminishing at that point.
Dyno tuning was minimal, it just didn't require a whole lot. It made best power around 12.9-13.1 AFR. We jetted down two sizes at one point and there was no difference really except for the AFR number on the dyno sheet so it is what it is. A bigger jet would have been wasting fuel.
Timing was started on the conservative side at 32 but was bumped up to 35.
I think it surprised the dyno guy, he laughed when I said it would make 500 and maybe 525.
Again, sounds like a good combo, you should be in the 10s with it if you can get it to hook with the 4 speed.