Cool... I guess i know what I'm buying myself for my BDay! Thanks for the advice !

 

Ya Eric, its from the Fastmans website...

 

i went with the 70 mm because of my cam kit. but you guys just need the 68 mm that is more then enough to have fun with

 

I'm a tad confused. According to the fastmans site we have 68mm throttle bodies. I know he said its not a true 68mm its 3mm smaller actually according to him. Is this true? Has anyone measured the throttle body on the 4.7L?

 

we do have the 68 mm but it is coned. if you were to look at a ice cream cone it is bigger at one end then the other. thats the way are tb are. what dan does is makes the tb the same size from frt to back. look at a coke bottle as the same way. bigger at the botom then the top. now look at a coke can. it is the same size top to botom. he removes that restriction . to make it the same size. you will notice the difference once it is removed.and you have them side by side.

 

I'd assume with it being bigger, it may cut down on low end torque...

just an uneducated guess though.

 

yes it will. if you go to big then you wil lose a lot of low end grunt. but in the higher rpm range it will be a screamer. but if you keep the stock cam set up the refabbed 68 will be just fine. you will notice the truck will not be so sluggish off the line. it will maintain speeds while going up a hill with the cruise on and it will even drop your rpm a little while cruising on the highway

 

Kinda like all the people that get the overkill exhaust sizes..

I know mine is slightly too large, cuz there is a little lag in it's going power, but I feel, once I save up for the cams....tb....flash....and some secret internal parts.... it shouldn't be too large anymore. :-)