8" crank pulley...I am confused

[celeste]

Okay, here it goes. Just put on a 8 rib 1000 on my 89 and I am looking to go with the larger crank pulley for boost. What am I going to buy? Do I go to a junkyard? What year truck am I looking for? Also, the crank pulley measurement that I am getting is 7" on the one that came from paxton. Also, some threads are mentioning a 6.5" pulley? If someone would give me detailed instructions on what to go after I would appreciate it? I do have the 8 rib, that is something else that I didn't see anyone specify, are the f150's 8 rib or 6 rib or ???? Please pardon my ignorance on the subject, but I have read so many posts I am confused....thanks so much.

[sinner]

The old Novi 1000 used a single drive belt and thus used a 6rib belt. These are the guys using the F-150 pulley.
Your seperate drive Novi will use the Vortech or ASP 8" crank, and will give you a gain of around 2-3lbs.

[celeste]

Thanks for helping out...any suggestions on where to get these pulleys? Thanks again.

[celeste]

Also, will I need a different size belt? Is this something I can get from a parts store or should I get it when I order the pulley....thanks.

[sinner]

You will need a new drive belt and a new blower belt. You can get them from a parts store.
I think most people get there pulleys straight from Vortech, not positive.
The blower belt if I recall correctly will be 59" and your accessories belt will vary on what all your running.

[regattacoupe]

summit is cheaper than direct from vortech. probably faster as well.

[blown5oh]

I've got the new revised 1k kit too. I've inquired about the 8" crank pulley. I have the 3.25" blower pulley on currently, but was planning on throwing the 3" on once I up my injectors to 42's.

I was told that if I go w/ the 3" blower pulley and do the 8" crank pulley I will over-spin the 1k. Is this true?

They told me that I would get the extra 2-3psi from either application, but the safer one would be to go w/ the 8" crank and keep the 3.25" blower pulley.

Suggestions?

[mygt8a4re]

yes, the 3" blower pulley & 8" crank will put you at about 57k rpms when the max(safe) is 55k. the 3.25 blower & 8" crank will put you at about 53k. right about perfect IMO.......

-justin

[blown5oh]

Thanks man!

[slow91]

this is probalby a late post, but i'm looking for the same thing. an 8" pulley for the 2 belt novi. vortech has it for 191.95 and summit raised prices to 208.95

[regattacoupe]

are you gonna change the blower pulley as well?!?! WILL SOMEONE VOID THIER WARRANTY SO I KNOW WHAT THE 3.25 PULLEY DOES WITH THE 8" CRANK?!?!?!?! LOL

[Goliath5.0]

I will tell you what a 2.50 blower pulley and a 8" crank pulley on an s-trim can do! (my 93 cobra's new new head gaskets never had a chance...) Took her out for a test drive, didn't even hit 5000 rpm in second gear before I head the ping of death, and smell of antifreeze. Turns out I forgot to take that 2.50 blower pulley off of the supercharger and replace it. (that pulley came with the head unit I bought). I then switched to a 3.33" blower pulley, replaced new/basterdized headgaskets and went on :)

That 2.50 blower pulley was smaller than a standard mustang alternator pulley, if memory serves correct!

With stock heads and intake (gt40 / cobra) that freaker felt strong. I was suprised.

[regattacoupe]

did you get a look at the boost gauge? ?!?!! LOL!

[Goliath5.0]

Didn't have one at the time, got one after the pulley change.
I do wonder how much boost I was pushing with that combo, BTW it had a powerpipe too LoL!