Tbi oem upgrades or pro flow 4?

[pops84c10]

Hey all so i need some opinions on what to do. I am building up my 92 sierra and have rebuilt the engine on a stock rebuild. I wasn’t anticipating doing that but scored cylinders walls forced my hand. Because of that I was kind of rushed to get it running and didn’t really think it through that I wanted to add go fast parts. Should’ve done it while she was opened up , but here we are . Oh well

So my question is which is the better route to go for a daily driver that I plan on doing Vortec heads a mild cam and some shorty headers? Should I got with the pro flow 4 setup or should I keep the oem?

If keeping the oem I would upgrade to a spr performance tbi bored out unit. Cam wise I’d probably go to an xe259 as to not upset the computer much. If I went pro flow maybe a 262xe.

 

[Scooterwrench]

No more than you're gonna do I would stick with the almost bullet proof factory TBI. Shouldn't take a lot of tuning to make it play with your minor engine mods.

 

[PlayingWithTBI]

If keeping the oem I would upgrade to a spr performance tbi bored out unit.

That's fine, stick with the TBI.

Cam wise I’d probably go to an xe259 as to not upset the computer much. If I went pro flow maybe a 262xe.

You can run both with your 46mm TB but, I'd strongly suggest going to a roller cam IF/Big IF, your 92 block has the bosses for one. Otherwise, I'd still think about going with Link-Bar roller lifters.

 

[L31MaxExpress]

The PF4 system is complete and total hot garbage and the single plane manifold sucks for torque.

 

[pops84c10]

That's fine, stick with the TBI.


You can run both with your 46mm TB but, I'd strongly suggest going to a roller cam IF/Big IF, your 92 block has the bosses for one. Otherwise, I'd still think about going with Link-Bar roller lifters.

Can’t go roller, block is not equipped

 

[Scooterwrench]

Can’t go roller, block is not equipped

Huh, my '91 305 block has the provisions for roller lifters although it had flat tappets. I guess some were, some weren't.

 

[PlayingWithTBI]

Yeah, later model TBIs didn't have them. IDK when the cutoff was. My Mr Goodwrench 350 (made in Meh Hee Co) had them and it was cast somewhere ~2000 so, it's kinda a crap shoot.

 

[Groosalugg]

So my question is which is the better route to go for a daily driver that I plan on doing Vortec heads a mild cam and some shorty headers? Should I got with the pro flow 4 setup or should I keep the oem?

I'd do the pro flow 4 in that case probably. I don't have a pf4, but have strongly considered it and probably will one day.

I don't like that it's only got 1 o2 sensor and that you definitely have to do a little work to the fuel system, but it's pretty much self contained and easy looking to get running good enough with 0 previous experience.

 

[L31MaxExpress]

I'd do the pro flow 4 in that case probably. I don't have a pf4, but have strongly considered it and probably will one day.

I don't like that it's only got 1 o2 sensor and that you definitely have to do a little work to the fuel system, but it's pretty much self contained and easy looking to get running good enough with 0 previous experience.

Except it is not good running at all. Loads of drivability issues and zero programability to it.

 

[Groosalugg]

Except it is not good running at all. Loads of drivability issues and zero programability to it.

You can say it a third time, I still won't believe you.