How big is the stock TB
#5
TECH Fanatic
iTrader: (1)
While the common factory ’99 thru ’07 Classic truck throttle body is called a 78mm, it is in fact closer to 75mm. I can’t say as to whether or not all the different variations (DBW & Cable) measure out exactly the same, as I don’t have an example of every configuration, but the opening of the intake manifold is basically 75mm as well, so it would make sense that they should also basically measure out the same. We know that all the intakes for the 4.8L thru 6.0L’s are basically identical outside emissions hook-up’s and whether or not they were for a DBW or cable operated truck, so I would venture to guess the throttle bodies are also sized accordingly. It wouldn’t have done much good to have a throttle body that was 3mm larger than the opening of the manifold.
Maybe someone else has some additional information on the subject.
Maybe someone else has some additional information on the subject.
#6
TECH Fanatic
iTrader: (8)
Join Date: Nov 2009
Location: phx the cactus patch
Posts: 1,022
Likes: 0
Received 0 Likes
on
0 Posts
Hello guys , I measured my 5.3 intake at 70mm and I've got a ls-1 I may install if and when I can find out who sells throttle plates . The ls-1 intake is 75mm which , btw , is a 15% increase in area . And an 80mm hole would be a 30% increase over the stock 70mm 5.3L intake opening . I have'nt measured my tb to see if they are different . So if anyone can help me with resources for throttle plates I would very much appreciate the knowledge . Thanx and good luck .