Take a XFire lower manifold, stir in a AL plate, a taste of BBC Throttle body, cook mildly with a 747, and you might wind up with something like this.
BTW, it runs really well......

 

Do you know the flow-numbers for that 454 TBI ?

What size are the butterflies?

A pair of stock TBI's flow 570 CFM together.
A Holley 2bbl TBI that has 2" butterflies flows 670CFM according to Holley.

Was anything else done to the intake / engine?

 

The BBC Throttle body uses two 2" butterflies, and depending on model year 80 or 90 PPH injectors. If you're to believe Holley then it flose 670 CFM. The reason Holey uses the 2" butterflies os to have a oem replacement for the BBC applications.

The engine is 355, AL vette L98 heads, cleaned up the chambers, Comp Cams 270, Edlebrock TES, 3" cat back, 80 PPH injectors, my own prom, the XFire manifold has a BUNCH of work done inside of it, crane spark box, lifter valley pan.

 

When you say it runs really well, what kind of performance we talking about here?

 

GRUMP......what are the two components on your fuel lines? Reg and filter?

And.....if I remember correctly reading that you had installed a second muffler where the cat usually resides to quiet down the exhaust? Mine sounds good but....it's several db's too much at times. Did you do something like this?

 

In full street trim, ie big sway bars, stiff shocks, and leaving from an idle ran 13.7s at 99.99. And would do that hot cold humid or dry. And it pulled in high gear just like in 3rd, in an FBod it was lots of fun.

 

Russel filter, and Mallory FPR.
Running a 14" ATR Pitbull where the cat was and a 16"(?) Ultra Flow. Those 2 mufflers and 3" pipe makes for a mellow sound.

 

Thanks Grump

 

Neat!

I'm working on adapting a 7747/TBI system for my friends '87 Volkswagen ralley car. It should be lots of fun...and lot of TIG welding

By the way...what are the benefits of the x-fire base? Flow?...simplicity?...

 

You can say that the Cross-Fire is wet-flow TPI. It it a tuned tourqe manifold. Lot's of low and mid range tourqe, and just like the TPI it does not flow enough to make high rpm hp. The TPI can be modified to flow more, and so can the Cross-Fire. The big differance between the two is that the TPI has a lot of bolt-on parts.

 

Well depends on which XFire your talking about and high rpm use.
I'd bet you can get a XFire to out flow the TPI.

And there is alot of junk out there for the TPIs.

 

I see. All the benefits of the TPI intake goals with NO runners...that's pretty snazzy

AND every company that makes ANYTHING for TPI thinks that it's made of gold. Prices for that stuff is rediculous...

 

Alright, I'll bite. What have you done to the inside of it, besides rip out the EGR, port-match the head area, and grind/smooth the runners?

I've been considering cutting the roofs, and raising them, then hand making a lid out of 3/8" thick aluminum.

 

Grump...I've thought of a couple of questions also...What size air filter is that and did you/are you running the manifold heated water that runs under the manifold to the rear?