Where can I go for harness modifications

[lionelhutz]

It really doesn't matter if it's a SD system or not. You just need the complete mechanical assembly and ideally enough of the harness to get the injector wires so you have those connectors and throttle body wires in case the connectors between the TBI throttle body and TPI throttle body are different. If you get an early one then you'd just throw away or re-sell the MAF stuff.

Trying to piece together a complete TPI system down to finding every nut and bolt could nickel and dime you to death.

The Edelbrock 3704 would have to be bored to accept the larger bore 454 TBI. You could also use a carb intake with the required EGR ports and then use an adapter plate for the TBI.

[Fast355]

It really doesn't matter if it's a SD system or not. You just need the complete mechanical assembly and ideally enough of the harness to get the injector wires so you have those connectors and throttle body wires in case the connectors between the TBI throttle body and TPI throttle body are different. If you get an early one then you'd just throw away or re-sell the MAF stuff.

Trying to piece together a complete TPI system down to finding every nut and bolt could nickel and dime you to death.

The Edelbrock 3704 would have to be bored to accept the larger bore 454 TBI. You could also use a carb intake with the required EGR ports and then use an adapter plate for the TBI.

The Holley Projection manifold used to be cheaper but requires a little rework to fit and a carb style EGR valve. It already has 2" bores and a wide sealing area that will seal correctly to a large IAC area 454 TBI.

300-66 is the part number.

[dave w]

Side by Side Holley / Edelbrock SBC TBI Intake Manifolds. Note the Edelbrock has been bored to accept the 454 throttle body with some radius work in the throttle bores to improve air flow.

dave w

[pro]

It really doesn't matter if it's a SD system or not. You just need the complete mechanical assembly and ideally enough of the harness to get the injector wires so you have those connectors and throttle body wires in case the connectors between the TBI throttle body and TPI throttle body are different. If you get an early one then you'd just throw away or re-sell the MAF stuff.

Trying to piece together a complete TPI system down to finding every nut and bolt could nickel and dime you to death.

The Edelbrock 3704 would have to be bored to accept the larger bore 454 TBI. You could also use a carb intake with the required EGR ports and then use an adapter plate for the TBI.

So I just leave the MAP connector on my TBI harness disconnected? Will the computer not throw codes? How will it measure air?
The reason why I ask is I was under the impression that 89 and newer TPI use MAP sensors right? My 92 has one mounted on the side, like this Vette does:
http://www.ebay.com/itm/90-91-Corvet...-/382059624647
But I cant find a single unit like the one my camaro (MAP on the side).

[Fast355]

So I just leave the MAP connector on my TBI harness disconnected? Will the computer not throw codes? How will it measure air?
The reason why I ask is I was under the impression that 89 and newer TPI use MAP sensors right? My 92 has one mounted on the side, like this Vette does:
http://www.ebay.com/itm/90-91-Corvet...-/382059624647
But I cant find a single unit like the one my camaro (MAP on the side).

You can add a vacuum port or tee into the fuel pressure regulator vacuum port and run the MAP off that.

You would not want a MAF setup if you can avoid it because you will need a cold start block off kit. The 1985-86 F-car and all Corvette TPI lower manifolds are also not drilled at the correct angle for the truck heads.

[Fast355]

https://dallas.craigslist.org/dal/pts/6103987090.html

A guy in your area also has a 2" bore Holley TBI. You can actually fit the stock injector pod to these and they work quite well.

https://dallas.craigslist.org/mdf/pts/6087393563.html

[pro]

I just came across this.
http://www.superchevy.com/how-to/eng...-tpi-manifold/
That is tempting. And vortec heads are all over the place. I have never gone as far as replacing heads before, but is it that big of a deal...

[dave w]

Edelbrock 3505 - SCB TBI to MPFI with Vortec Heads.

dave w

[pro]

Mine is the 3501 but too bad they arent made anymore and I doubt they can be found online anymore.

[pro]

I read over moates, and it appears that the 95 model vehicles may be flashable? So no chip burning required?

[lionelhutz]

No, just the 94-95 LT1 PCM's were flashable.

[Fast355]

No, just the 94-95 LT1 PCM's were flashable.

Not exactly true. Never have seen a 350 version but I have heard of a few TBI 350 engines in 1995-1996 that had a Vortec style black box, crab style distributor and crank sensor. I have seen both a TBI 4.3 and CPI 4.3 setup this way.

[pro]

I bought a burn2, and eproms on the way, and still waiting on some emails to be returned, and other hardware to be shipped.

[EDZIP]

FYI I converted my 94 K2500 to TPI...I have an NV4500 so the the 4L60E was not a problem, just pinned in a 730 ecm...trucks not on the road yet...hopefully this summer.