Welcome Smittie, we kind of like to consider ratios on pulleys...So you have a 8.5"lower, if you put a 3" upper on the blower you will end up with a ratio of 2.833, always divide the lower by the upper...That means that the blower will spin 2.833 times for every turn of the crank...That said you didn't mention what blower you are talking about, that could make a big difference in your choice.
Details are its the stock svt blower with the stock pully. I went ahead and put TF on with mahle piston and arms, With a 65lb billet crack and I was planning after deployment to switch over to a KB but I just wanted help so I dont blow anything on this stock blower.
I actually figured that wrong you have a 9.5 lower so that would make it 3.16 ratio, sorry...As long as you have the stock upper the ratio would be 3.24 and your built engine will handle it well with a proper tune...That is spinning an Eaton pretty hard, but the little rascals are tough...Heat might be your biggest problem, but that would be with any blower spun that hard.
I was having some bad luck with a string of alternators, went thru 3 in a month. While I was waiting for my 4th one to get switched to a 1 wire, I had decided it was a good time to down the truck and fix some things I have been wanting to address. Clean the intercooler, do the f250 trans cooler...
So I was looking in to getting a new Whipple for My truck. I am really considering a 2.9
An was just wondering how the people who have them like them and how they perform
I was also wondering what Is the difference between the Gen. 3 and Gen. 4