carb swap!

[maroman88]

well i wanted to do an LT1 but timing and funds wont allow, sooo

im sick of my TPI giving me problems, i wanna go carb!
its going to be on a stock 305 motor, was originally a TBI.
wat kind of manifold, carb, distributor combo works best and is cost effective?
do i have to change out the tpi fuel pump or is there some type of regulator?

looking to start this project ASAP

[bubba428]

if you want I have a CCQjet with intake and full UNCUT wire harness and ecu

[madness410]

what kind of problems was your tpi giving you if you dont mind me asking

[BonzoHansen]

I have a standrd performer intake here somewhere I'd sell you on the cheap - good for a 305. Standard head bolts.

Other things I think you'd need: a standard hei dizzy, fuel pressure regulator, fuel line, air cleaner housing & filter, t-stat housing & gasket, upper rad hose, throttle cable, choke wiring, maybe a vac fitting for the brake hose, a fan switch if yours is ecm controlled now, intake gaskets, coolant, ...I'll keep thinking about it....

But I'd rather have EFI. What's wrong?

[maroman88]

i never got the TPI to run right, replaced everything 3 times, im bored with it, i wanna learn about carbs, new project........

i took a summit catalog to work with me over night last night and picked out a few things, when i wake up later ill post up what i liked so far

[maroman88]

manifold

http://store.summitracing.com/partde...4&autoview=sku

carb

http://store.summitracing.com/partde...0&autoview=sku

not sure if this is right.... distributor

http://store.summitracing.com/partde...0&autoview=sku

edit, found this in the next town over from me lol
http://cgi.ebay.com/ebaymotors/Accel...2em118Q2el1247



what should i do with the wiring harness? remove it and wire up what i need?

[Tru2Chevy]

You can remove any wires that come from the computer into the engine bay.

That ebay auction will work fine. I would stay away from Edelbrock carbs, go with a nice simple Holley. Also, that manifold you posted will work, but considering the cost, I would talk to Scott about what he'll let that Performer he's got go for.

- Justin

[maroman88]

Originally Posted by Tru2Chevy

You can remove any wires that come from the computer into the engine bay.

yea thats what i was thinkin, i kinda feel bad destroying a perfect TPI harness tho lol but ya gotta do watcha gotta do!

Originally Posted by Tru2Chevy

That ebay auction will work fine. I would stay away from Edelbrock carbs, go with a nice simple Holley. Also, that manifold you posted will work, but considering the cost, I would talk to Scott about what he'll let that Performer he's got go for.

- Justin

ok but whats the deal with the "standard head bolts" is that for the pre-87 style heads? i was lookin for one for the 87-95 so i wouldnt have to drill out the bolt holes

[Jersyboyy]

Im picking up a performer rpm intake. When I get that you can have my performer 2101 intake for 25 buck!

[Tru2Chevy]

Originally Posted by maroman88

yea thats what i was thinkin, i kinda feel bad destroying a perfect TPI harness tho lol but ya gotta do watcha gotta do!

Why destroy it? just pull it all out in one piece and keep the setup or sell it whole.

- Justin

[maroman88]

Originally Posted by Tru2Chevy

Why destroy it? just pull it all out in one piece and keep the setup or sell it whole.

- Justin

well arent i going to need some of the wires? like to the starter and alternator, AC and watever else, the whole thing that comes out of the driver side firewall... i was guna buy a cheapo harness from a carbed 3rd gen or even a TBI car and cut out what i dont need, this way i can sell the TPI harness with the TPI set up

[Tru2Chevy]

Hmm....maybe the TPI harness is different than my LG4 harness. I was able to yank everything that comes from the computer in mine with no issues. The HVAC wiring and battery/starter/alternator stuff was separate.

- Justin

[Fast92RS]

Yeah my tpi harness is all one peice to seperate it you would have to cut it up. I think you would be better making your own harness or buying a harness form a junk car or maybe a painless, either way your gonna have to custom wiring.

[nj96z28]

Originally Posted by maroman88

i never got the TPI to run right, replaced everything 3 times, im bored with it, i wanna learn about carbs, new project........

i took a summit catalog to work with me over night last night and picked out a few things, when i wake up later ill post up what i liked so far

i remember my '85 iroc... that tpi was PoS , given I beat the snot out of it but i blew through 3 egr valves .

Go Carb Conversion, be sure to match your intake and tuning

[maroman88]

hmm would a 3rd gen carb'd fuel pump be the same as a TBI fuel pump... i know the TPI's like wayy to many psi so i gotta change it out

[Tru2Chevy]

3rd gen carb cars used a mechanical pump. You can leave the TPI pump in place, you just need a return style regulator.

- Justin

[maroman88]

so this lil guy? and what else should i invest in to make her work? i wanna place one order from summit for all the fuel needs

http://store.summitracing.com/partde...5&autoview=sku

[maroman88]

hmm what size are the stock TPI rubber fuel lines, so i can buy the fittings for the regulator... -6AN?...

[WildBillyT]

Originally Posted by maroman88

hmm what size are the stock TPI rubber fuel lines, so i can buy the fittings for the regulator... -6AN?...

They are probably not AN threads. You are probably looking at 3/8" line size with NPT threads.

[Tru2Chevy]

Originally Posted by WildBillyT

They are probably not AN threads. You are probably looking at 3/8" line size with NPT threads.

Bingo.

- Justin

[maroman88]

ok im at a loose here right now. im guna order the mallaroy 3 port regulator, its inlets are 3/8in NPT female, the stock TPI rubber lines are also 3/8in NPT female, now i cant find any NPT male to NPT male adapters anywhere........

[WildBillyT]

If it's rubber, can't you use a 3/8" NPT barbed fitting?

[maroman88]

it has 3/8in fittings on each end already and its at ~50psi

[WildBillyT]

You need a 3/8" NPT pipe nipple.

Like so:

http://www.hrpworld.com/index.cfm?fo...action=product

[maroman88]

niiiice thanks! couldnt find anything like it on summit