bbk 75mm throttle body...

[Anonymous]

i have one of these i got years ago for another project and im thinking of using it on the stock 300 FI intake manifold. it is for a 5.0

Here is what im thinking.... cut the face off the manifold that the stock TB bolts to... and weld up a 1/4" flange that thet is machined to have the bbk blot up.

so what do you guy think?

 

[fb71]

I could be wrong, but I beleive the 5.0 and 5.8 truck TBs are a direct bolt on. The stock 5.8 TB would give you just as much if not more volume of flow than a single 75mm.

 

[Anonymous]

well the 300 has two butterflys... and the bbk is one large butterfly... I want the bbk because it would make for a clean look when i pipe up an intercooler.

to be honest part of me is itching to weld up a custom intake manifold, with shorter runners.... i have the metal lying around... and it would give me a reason to use my dad's plasma cutter.

 

[fb71]

ok, in that case, go for it!

 

[StrangeRanger]

The 5.0/5.8 T/B is 2 x 50mm, a bit smaller in overall area than a 75mm single but way larger than the stock unit (I forget whether it's 43 or 44mm). Edelbrock at one time offered 56mm and 61mm dual T/Bs for the V8 trucks, perhaps they or BBK still do.

But the stock T/B is apparently not the bottleneck in the 300's ability to breathe. A few people have upsized to the 50mm units and reported no gain in performance.

If you're making other mods to the engine, then maybe upsizing would be of some benefit but I'd look at a 50 or 56 dual before doing all the work to convert to a single. Even with the larger dual you're going to have to do some minor work open up the ports in the T/B mounting flange of the upper manifold to match but no fabricating.

 

[Anonymous]

The venturi in my Holley 1 bbl carb is 1.125" (1-1/8")

Sell the 75mm and enjoy the money you get from it.
A stock 55mm TB will flow plenty under boost.

 

[Anonymous]

i guess if your running 13's on a 1 bbl you have proved your point.

 

[hasa68mustang]

i guess if your running 13's on a 1 bbl you have proved your point.

yea linc is pretty good.