does anyone have a 50mm fastman that isn't installed on the truck?
i need some dimensions and a picture or two (a close up that is better than on the website).
i recently got a used throttle body for 20$ and i want to make a home brew fastman.

the fastman saysFor the 5.2 I recommend my 1.980 bore "50mm" TB.

i measured my throttle plates and they are 1.978 inches (50.25mm). so that means if i bore out the holes to 1.980" that the throttle plates will probably get stuck at closed throttle.
i can make new brass throttle plates on the lathe but i don't know the diameter of the new ones for the 50mm throttle body.
i also don't know the diameter of the center of the bores (where the throttle plates rest at idle) and the top and bottom edges.
hopefully someone has a dial caliper and a fastman that isn't installed on the truck so they can help me out.

 

well i dodnt have a fastman,, but i also made one,, all my research it a 50mm bored so i just kept the stock plates,because thinkin if it leaks and we are talkin mm the iac will jaudt not open as far
https://dodgeforum.com/forum/2nd-gen...or-man-tb.html
back when i did mine a had the ****y dial caliper(like 1 frist grade one)

also this just said 50mm
http://dodgeram.org/tech/gas/specs/5_2v8.htm

sorry that i not a fastman owner... but a poorman owner.... hope that i helped

 

so yours is 50mm all the way through with no taper above and below the throttle plates?
after i get off the milling machine with mine i will post a few pictures so you can compare mine to yours.
and since my plates are 1.978 instead of 1.980 then i'll bore it out to 1.978 so i won't have a .002 gap between the plates and the walls.

 

i want to say 50mm all the way through

just cant remember that far back,, real cear

on the milling machine i took off sum all the way pass the plates

if you can tell in the pic

 

that is pretty much what i'm going to do too. but i'm going to taper the holes from where the plates sit to the outer edges. and i'm going to knock down the 4 posts that line up the air cleaner and taper them as well.

 

Well mine is not off the truck, but I do know the 50mm goes all the way through. If they don't go all the way, then it defeats the purpose.

 

you can see in the pictures that the plates don't sit flat across the hole, they are on either side of the high point in the center, thats why i was asking about the bore being 50mm straight through.
i am thinking that i should make the high point in the center 50mm and taper it on either side like it is now. maybe to about 52mm.

 

I'm pretty sure he does the 50mm all the way and just uses bigger plates.

 

if I wanted to take my stock TB and bore is all the through to 52mm where would I go to get the plates? Just down to napa? what they run?

 

I'm pretty sure he's rounding up, no way anyone would bother with a measly .002"...