I recently got a 350 4 bolt main for 50 bucks

I plannig on boring it .30 over and then stroking it to 383
maybe a super or turbocharger not sure yet but I was wondering if I should keep it TPI which is what I want to do
but can I get lots more power out of a carb???

 

youll get better driveability outta fi. and with tpi, a torque monster

 

will I need to do any mods with the tpi in order for it to run effectivly???

do I need a bigger throttle body??

 

If you can run a carb without going afoul of inspection, do it. The TPI will hinder performance. Greatly. For the money you spend to make it "better" you could get a great carb intake combo. With your carb properly tuned and your timing right, you will have just as adequate driveability as with FI. Remember cars werent always fuel injected.

 

And theres a reason they aren't carbed today.

 

should I get bigger runners, throttle body, and injectors?

 

I think it's emissions, not cost effectiveness though.

Sorry, just playing devil's advocate.

If cost wasn't an option, I'd go with Holley's StealthRam, or a single plane efi conversion. If you are really in a pinch and want to stick EFI, go for the LT1 intake conversion & prom burn.

 

I would keep the TPI for now if he already has it. I know, I know, I sell the LT1 intake conversion so why not steer him that way? Well, in his opening post he said he was going with a supercharger or turbo. That changes the rules of induction folks. What was once a hindering small runner TPI intake isn't anymore because of the laws of pressurization. It will run like a raped ape with boost applied. I don't know for sure if changing the intake after that will have a dramatic effect or not but it will run well with stock TPI and boost.

 

As said above, emmissions and other nasty little laws

Agreed entirely.

 

Really - I figured you would feel just the opposite being that the length of the runners would only give the pressurized air time to heat to the same tempature as the intake, reducing density. Interesting none-the-less.

 

thanks for all the help guys I have decided to keep my tpi for the 383

 

well guys I was looking around prices to build a 383 stroker and its a little more than I want to spend at the moment

So I think I am just going to build a strong,fast, **** eating 350 for the time being.

which starts my topic over "how about the tpi on a 350"???

sorry for the sudden mind change

thanks for all the help

 

TPI isnt all that horrible

If your on street, torque is what ya want.

all this talk about TPI choking motors makes it sound like its
out of the stone age.

and a LT1 setup is quite similar to a TPI, without the long tube runners,
and the higher compression motors the LT1 came on.

if your gonna go with blower, ATI makes a hell of kit
for a L98 TPI with a excellent boost warranty.


OH! what is the 350 out of? 50 bucks!??
same applies if your gunna supercharge.. even tho a built 383 is
is chocolate icing with a cherry on top!!

 

I would have to suggest ditching the TPI if you dont have emissions. I went down this road and have been kicking myself ever sense. I built a fully forged 383 with AFR 195 eliminators, edelbrock base, slp runners, and a ported plenum and its still chokin the living $#!% out of it on the big end. Ran a best of a 14.4 at a track at 5,800ft. I am now in the process of switching over to an rpm air gap and a 750 double pumper.

 

Wow, this thread is four years old! .. holy crap!

Ever hear the expression the difference between insanity and genious is
only measured by success? There is a quite few people who have built very nasty 383 Tuned Port engines. But, compare that to the number of people who have tried and failed... yea.

14.4? So you spent thousands of dollars only too shave 4 tenths off a
factory TPI car? I dont think I could blame TPI for that.. no offense.

Then again 5800feet does suck.

 

I ran the stock TPI on my mild-383 and it was probably costing me 40+rwhp. However, the giggle-inducing torque was quite fun...except for my tires.