my car now is a tbi 305.
im putting a nice cam from comp cams and have a set of 081 heads built up with 1.6 roller rockers 3angle valve job the works pretty much. some porting.
but im not sure will i see more horse power out of tbi or tpi. or would it be teh same.
i have an entire tpi set up tho its a maf setup.
should i take the time to just put the tpi on there would i see more power then i would with the tbi?

and the machine shop doing my heads is recommending this cam 08-302-8

i just want to do whats best for my 305 until i save up more for the 383.

 

The TPI's are a pain to work on and have a limited power band.

You can use a LT1 intake... here's the conversion....
http://www.lt1intake.com/files/pricelist.html
And another link:
http://www.popularhotrodding.com/tech/0803phr_beast/
I hope both those links work.
It's a little more work to setup but the end results are better and easier to work on in the long run.
Think about putting on some good aftermarket allum. heads
~Scott

 

TPI only make power until like 4500 then they die.....and they are ALOT more exspensive to mod and ALOT more work to get alot of power out of besides stock. TPI is very finicky..

 

It does look badass though.

 

I'll have to say the TPI comments are long on rhetoric and short on facts.

'90-'92 speed density TPI is finicky to engine changes, but not finicky to operate. TPI upgrade parts are available to take its powerband well over 4500 RPMs. The cost may appear high, but changing to a different system is bound to cost as much or more.

The '57-'65 Rochester fuel injection system defined "finicky". It would change with the weather. If you were willing to fiddle with it regularly, it would flat-out haul, though. My older brother tells stories about our older cousin that has "the knack", and had a 327 he put in a '55 Chevy with that Rochester injection, and 4-speed. For the day, it would flat-out haul, but he was willing and able to dink with it whenever necessary to keep it running right. Truth is, modern EFI systems run circles around it.

MAF is more forgiving than SD for engine changes. It's just a little more limited on the top end of power capability. On a 305, it will be just fine. The key is the cam - what are you planning on using? 1.6's probably aren't necessary, and probably aren't going to help much - did you ask Comp about that?

 

Personally, I think it's the best-looking stock induction they ever made. But, being a function over form guy. . .

 

im not exactly sure one what cam the guy at the machine shop pretty much helped me decide i told him what i wanted and what gears i have in the rearend, but he gave me the part number, 08-302-8 from comp cams.
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and just to clarify witch one would be better sticking with? i think i want tpi but what setup of tpi sd or maf. what are the benifits. and eventually im goign to put a 350 bored 60 over. so what ever will help me with both of those. i know i ask alot im jsut trying to figure exactly what to do. but what kind of things will make it haul past 4500

 

Decent looking cam. I'm a little surprised a roller computer cam would be single profile, though.

.480" lift is about the limit for stock heads unless the guides have been cut down. I hope new valve springs is in the mix.

The TBI forum has a lot of information about getting the most out of that system. The aftermarket support for it has been lean, so results tend to be more limited than for other induction systems.

With the other TPI manifolds available, such as Steath Ram, Super Ram, and Miniram, the real limitation to it is the fact that it's batch fire. The limitation of MAF is the 500 cfm flow capability. SD it pickier about changes (already mentioned), but responds fine to PROM tuning and isn't artificially limited by flow capability. If you've got 350 plans in your future (why .060"-over?), then SD is probably a better choice. Of course, TBI would support a 350 easily as well (same SD tuning issues).

 

im not exactly sure on the exact bore the same machine shop did it as the heads yes hes putting different springs. he mentioned something about bronze guides 3 angle valve job milling it down i dont know my dad has known the guy since the early 70s. o and it had to be bored further then .030 because i got it for free and a guy let water sit in the cylinders. so it needed some work. im just wandering is that a nice cam or is it better to go bigger haha