decisions, decisions, decisions....

[PJG1173]

HHMMM. Looks just like my AirGap only $120 less than I spent 9 years ago. Funny how prices drop after the 'cool' factor goes away. Why not put bungs in that manifold and go PFI. I've thought about doing it with mine.

nope the edelbrock is still stupid expensive. this is an off brand...

[dyeager535]

nope the edelbrock is still stupid expensive. this is an off brand...

I went Vortec with my TPI setup, and the Vortec stuff is expensive...you already have your heads, had I known the hassle before I got mine, I would have gone with the conventional intake bolt/head pattern, but with better ports/chambers (AFR, etc) to keep the injection options open. Obviously TPI isn't much of an option for you in any case.

I'm going to fuel inject the Olds 403 in my car, but unless the cost of fuel rails have come WAY down, it was so much more expensive that the port injection benefits over TBI weren't enough to justify the cost. 454 throttle body on a Quadrajet intake it is.

[1project2many]

I'm going to fuel inject the Olds 403 in my car, but unless the cost of fuel rails have come WAY down, it was so much more expensive that the port injection benefits over TBI weren't enough to justify the cost. 454 throttle body on a Quadrajet intake it is.

'76 Olds injection manifold??

[dyeager535]

If I could find a picture of one with the air cleaner off, I'd check it out. I vaguely recall looking for info on it years back. I suspect the injectors used aren't "standard", or at least readily available today.

That's another large investment not required with the complete 454 TBI's.

Not saying I love TBI, but for ease of application/cost, it's tops for EFI on a motor that originally had a Quadrajet.

[1project2many]

is MPFI really needed? would I see that big of a difference? is the difference worth the additional cost?

It's easier to make 400+ hp with the larger TB of the MPFI intake. And it can be easier to tune if you're using the engine in more extreme conditions. But if finding the right intake for the right price is an issue, go with the TBI and don't look back.

If you find an off brand carby intake or get one cheap, it might work out to build a PFI intake over time. I actually bought a special bit from MSD for opening an intake for injectors so I didn't have to pay machine shop prices.

[1project2many]

If I could find a picture of one with the air cleaner off, I'd check it out. I vaguely recall looking for info on it years back. I suspect the injectors used aren't "standard", or at least readily available today.

Funny how things get learned then lost. Bob Valentine used the '76 Olds intake to inject a '71 Cutlass ragtop w/403 back in the '90s. The injectors can be replaced with common injectors with a little work. Here ya go:
http://www.grimers.com/vehicles/olds/403efi/

[EagleMark]

Found this picture of a CAI on a vortec and looks low enough for JeepsandGuns...

[PJG1173]

It's easier to make 400+ hp with the larger TB of the MPFI intake. And it can be easier to tune if you're using the engine in more extreme conditions. But if finding the right intake for the right price is an issue, go with the TBI and don't look back.

If you find an off brand carby intake or get one cheap, it might work out to build a PFI intake over time. I actually bought a special bit from MSD for opening an intake for injectors so I didn't have to pay machine shop prices.

This is the route I will be going. I'm sure I'll come across another carbed vortec intake to experiment with in the future. I'll keep the stock vortec TB for when the time comes. do you by chance have a part number for that tool? just so happens my current intake came with material cast in the runners so they can be drilled and tapped for NOS.

[EagleMark]

http://www.ebay.com/itm/RMR-064-14mm...f5897c&vxp=mtr

Although a machine shop may be able to do it for this price... don't forget they all have to be perfectly straight and the fuel rails have to be perfectly straight or you ruined everything and have a fuel leak...

EDIT: Give Marlo a call and see if he is still doing them.

Trueline
2244 W. Lundy Blvd.
Post Falls, Idaho
83854

Ph# 877-777-5343
208-755-3876

Attention Marlo

[1project2many]

MSD# 2160. Not cheap but if you plan to do more than one manifold probably worth it. Some guys use 17/32" bit. Correct size IIRC is 14mm.

[dyeager535]

Funny how things get learned then lost. Bob Valentine used the '76 Olds intake to inject a '71 Cutlass ragtop w/403 back in the '90s. The injectors can be replaced with common injectors with a little work. Here ya go:<BR><A href="http://www.grimers.com/vehicles/olds/403efi/" target=_blank>http://www.grimers.com/vehicles/olds/403efi/</A>

<BR><BR>

That's what I get for dealing with Oldsmobile. Stick with Chevy and life is easy. :)

So the info should be on diy-efi. Noticed yesterday it was down (again). I hope someone has got everything there archived or something. There is a lot of data there, such as info on the above links topic, apparently.

[gregs78cam]

If I had my Mill wired up and running, it wouldn't be too hard.
1. Set up manifold on mill, and bore 1" hole through runner at injector location.
2. Weld in 1" round stock for bung.
3. Mill all bungs on each side to same height.
4. Drill injector bungs with the RMR tool Mark listed.
5. Clean up inside of port.

That is how I would do it.

[EagleMark]

I need a freind with a mill wired up an running...

[1project2many]

Someone has converted the archives into HTML and many of the links are wrong. I'll try to figure out the correct link. I've seen Bob's car and I remember some of the things he went through during the tuning stages. It was a truly great project considering the amount of cash and effort invested and the performance and longevity it returned. I believe he still has the car, actually.

[EagleMark]

That was back in 2000, really anything you need to know should be out there. Really all you need to know is what to use for injectors, then make an adapter to newer TB. I have most everything saved from DIY-EFI and GMECM so if you have the URL let me know?

But we've been told before this happens and it always comes back.