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Hey guys, I have the opportunity to pick up an edelbrock 3502 tbi to multiport intake locally for dirt cheap. Has anyone here ran this intake? I know it's basically a single plane intake you can bolt a tbi unit to. Any input would be great
Re: Edelbrock 3502 Multiport intake. Any thoughts?
So, kinda like you, I stumbled upon mine for $50. I wasn't planning on a MPFI conversion at the time, but at that price, I thought "why not".
Pros: I could use Pro-Flo XT fuel rails that I already had from another project. All the accessory brackets/lines bolted up. It has a CARB EO#, so it might have a chance of passing emissions if I ever move somewhere that requires that.
Cons: Won't support larger than a 46mm TB without some grinding. The ports are stock size and the manifold barely had enough material to seal a 1205 gasket that my heads needed.
Overall, it was the easiest/cheapest path for me to go from TBI to MPFI, but I think I'm probably sacrificing some power for that ease of use.
Re: Edelbrock 3502 Multiport intake. Any thoughts?
Originally Posted by robertfrank
How did or do you guys like it? What would you say the pros and cons were?
Mine was a Vortec pattern and I replaced the TBI setup on a carb intake with it before I obtained a Vortec TPI base. The con for me was the pico injectors. I ended up using short style GM 5.3 Vortec injectors. I had a 2" TBI on mine and its large foot print required a large foot print open center TBI spacer to seal the extra wide IAC passageways.
Re: Edelbrock 3502 Multiport intake. Any thoughts?
Originally Posted by Fast355
Mine was a Vortec pattern and I replaced the TBI setup on a carb intake with it before I obtained a Vortec TPI base. The con for me was the pico injectors. I ended up using short style GM 5.3 Vortec injectors. I had a 2" TBI on mine and its large foot print required a large foot print open center TBI spacer to seal the extra wide IAC passageways.
where can I find those Injectors? What is their flow rating?
Re: Edelbrock 3502 Multiport intake. Any thoughts?
I used Bosch 0280158191 injectors on mine. They're a short style, flex fuel injector from Ford's 3.7L engine. 31.4 lb/hr @ 43.5 psi
Also, unless you plan to run a TB spacer, you do need a short injector. Otherwise, the throttle arm on the TB hits the fuel rail.
Re: Edelbrock 3502 Multiport intake. Any thoughts?
Just thought I'd post another update....
I'm trying to be as creative as possible with this so.... from what I've read, you needed to run the shorter style PICO injectors and edelbrock rails for this manifold. Well, I don't feel like spending over $400 for new rails and injectors so I modified a set of stock LT1 fuel rails and did a little grinding on the manifold itself. Turned out perfectly although I'm covered in aluminum dust lol. I need to drill holes in the bottom of the rails so I can mount them to the manifold. This will allow the use of a set of Bosch 3 24lb injectors I plan on getting. I'll need to get some large taps so I can fit these for AN fittings.
Re: Edelbrock 3502 Multiport intake. Any thoughts?
Originally Posted by robertfrank
Just thought I'd post another update....
I'm trying to be as creative as possible with this so.... from what I've read, you needed to run the shorter style PICO injectors and edelbrock rails for this manifold. Well, I don't feel like spending over $400 for new rails and injectors so I modified a set of stock LT1 fuel rails and did a little grinding on the manifold itself. Turned out perfectly although I'm covered in aluminum dust lol. I need to drill holes in the bottom of the rails so I can mount them to the manifold. This will allow the use of a set of Bosch 3 24lb injectors I plan on getting. I'll need to get some large taps so I can fit these for AN fittings.
just an fyi, you can purchase rail extrusion by the inch from rps and others very affordably, and have them drilled, reamed to final size for cheaper than you may suspect. Then make your own rail stands or mounts. I've read posts saying the lt1 rails were the same spacing as most aftermarket intakes. Playing with pieces on a bench while waiting for parts a couple years ago I found the stock lt1 injector spacing was definitely not the same as the miniram, not the same as the first tpi, or Holley EFI single plane. Close, but not the same and when you have 43-58 or more psi of gasoline head pressure in the rails having an injector cocked sideways 80-100 thousandths is not good. It's best to have the rails laid out to precisely match the intakes injector holes and keep a tighter tolerance. 400 bucks seems like a lot of money for rails until it costs you an entire car when it burns to the ground. They don't have to be ultra precise, but they do have to be reasonably close. The 93-96 lt1 intake rails I tried on my miniram had the injector pairs splayed out and the spacing was way wrong, visibly wrong. Please be careful when mixing and matching components like this. Custom rails are a bargain when you consider the bad things that can happen.
05-17-2022, 08:02 AM
