I was just wondering if you could use TPI heads with a TBI setup. Would everything bolt up ok, what about the EGR? Would it still work properly?

 

yes, yes, and yes as long as they are f-body TPI heads. The vette aluminum TPI heads don't have internal EGR passages.

 

yes.. i have checked 305 tpi heads with bolt right up to a 305 TBI ENGINE.. I will be running them with an lt1 cam soon.

 

I to was wondering if they would work with TBI. I was trying to decide whether to use the TPI heads or the World S/R 305 Torquer heads. Which set would be better to use?

 

Worlds heads obviously. If you can afford them, get them. If not, go with ported and polished TPI heads.

 

What are the valve sizes of the 305 TPI heads?? Also what is the combustion chamber size??

A friend of mine has a set just layin around in his garage.

 

also, would an Edelbrock TBI intake bolt right up to it, i thought i read somewhere that the middle 2 intake bolts are at different angles. Probably nothing big, but just wondering. Thinking about doing this swap with my LT1 cam, and Edelbrock intake in the summer.

 

too bad the 45 horses or so don't come along with the heads. If you had TPI heads then why not go the distance and switch to TPI it was designed for the 305 anyway.

 

Heads are a lot easier swap than a fuel injection system. A stock TPI doesn't have all that much in performance over TBI, not enough to go through the hassle of a swap anyway.

 

Because TBI RULES.

TPI is a pain in the a$$. GM engineers must have spent years designing an intake that actually gets in the way of ITSELF when you try to take it apart.

I have a feeling I'm gonna get it for that one...

 

You would have to drill and retap the center bolts, Cause TBI uses a straighrt down bolt desgin, while TPI uses a angled bolt down design, Of course I am speaking of the center intake bolts that bolt the intake down to the heads.. The Heads would have to be drilled and retapped.. I just used my TBI Heads, Cause your not going to see any improvement, unless you get that bigger holley TBI unit.. make the heads bigger with still limiting the amount of air coming in.. All flow number need to match from TBI or TPI or Carb CFM and Intake CFM and Head CFM...

 

TPI used both. All you have to do if you want TPI heads that bolt up no problem is find some from 87-92.


Our throttle body can support up to 300 hp if setup right. On a 305 it will flow as much as you will ever need mostly likely. That holley unit is much too big for a 305. TPI heads are supposed to be a big gain over TBI heads. The TBI heads are a limiting factor. At what point they start becoming a major limiting factor I don't know.

 

Guys, you were talking about the Holley TBI unit, what is the part number for that? Thanks

 

most people get it used and use the better stock GM injector pod with injector from a 350. www.holley.com

 

What is the difference between the heads. My brother is working on a tbi car and i have and old tpi motor in my garage Minus the TPI. Is there any real gains to be make by this swap or just the porting.

 

so TPI really isn't that much of an improvement over the TBI? I was thinking about doing the conversion in the spring, but if it's really not worth it, I may be thinking twice. Are we talking strictly hp or overall performance/responsiveness also?

 

For a stock 305, TPI is a great improvement. For a 350 a stock TPI unit will choke it more so than a simply modded TBI system. It all depends on what your goals are and what engine its going on.