MicroSquirt.com read only forum (Jan.15,2018)

Please help me with my dilemma, no matter how much I explain it my wife she just can't (or perhaps just doesn't want to) give me any advice.

I have just built a MS I on a V3 board. It will be going onto a 350 SBC with newly installed Vortec heads sitting in a 68 El Camino. I live in Hong Kong but the vehicle is in Winnipeg, Canada at my Father in Laws house, so I only get to work on it ocassionally when visiting the Prairies, hence I have a lot of time to plan and dream and not a lot to actually do some fun stuff.

As the project is at an early stage I am torn between buying a used TPI setup and the Scroggin Dickey Vortec lower manifold, or going the modified Single Plane manifold DIY throttle body etc etc.

I am not made of money but as I see it the cost may end up working out about the same, however if I buy a used TPI setup I will get all the ancillaries such as Rails, Pressure Regulator, IAC, TPS, injectors et al in a comprehensive package as opposed to a total DIY affair (yes I do realise the spirit of MS is DIY)

As I understand it the TPI will provide superior torque down low compared to a Single Plane manifold, which may be beneficial on a 3600 lb vehicle which is still running the original Powerglide (don't even get me started on 4 speed Overdrives).

Has anybody followed a similar route or have any advice?

TIA

Luke

Luke,

I went through this decision, and actually had a TPI manifold on the shelf. But I went with a single plane manifold. For me in made more sense because of my engine is 406 CID (the TPI was designed for 305 CID), has aftermarket heads and cam, and it is in a light weight vehicle.

I went with the Holley manifold/rails/regualtor set-up, and it was an easy install (easier than a TPI, actually).

In your case, I'd be tempted to do as you suggest and get the TPI. It should work well with the heavier vehicle and 2-speed trans. You can always upgrade the runners later (they are the biggest restriction).

Lance.

I may be a little off base here but you mentioned you are using Vortec heads. I don't think the TPI manifold will bolt up to these. They use an odd silicone gasket and only 8 bolts. The TPI's I am familiar with use the traditional 12 bolts. Some in the past have adapted by drilling and tapping the heads but the ports don't line up correctly. I think you need to use a Vortec manifold and adapt from there.

Todd

The aftermarket still supports tpi.

http://chevyhiperformance.com/techarticles/56858/

it might be a bit costly....

Luke, I'm running a '70 Chevelle. (3700 lbs with me) Like you, I was going to go with a TPI, but after doing lots and lots of reading, I came to the same conclusion as Lance -- that it just wasn't going to be enough for my 406. I have a bunch of TPI parts sitting around waiting for a good project.

The Scoggin-Dickey Vortec TPI base is a spendy piece at around $400, considering you'll still need a plenum, runners, throttle body, and fuel rails. For not much more ($550-ish, with rails & adj. regulator) you could get a Vortec Holley Stealth Ram, although you'll still need a TPI (or aftermarket) thottle-body.

Since you only have a powerglide and a 350, TPI might be the best choice for you. I certainly wouldn't go with a converted single-plane. You're gonna need all the torque you can get! You didn't mention your cam, which will factor in there too. I'm assumiung that it is somewhat stock.

The TPI will also allow you to run a small or large cap HEI -- the Stealth Ram requires a small-cap.

I'm really, really happy with my conversion to Megasquirt. I'll never go back to a carb.

Check out my success story. I tried to put as much relavent info as I could in there, especially since you're also dealing with a GM A-body.

-Dave

As for me, I too understand the heavy car/tight budget. I have a 55 chevy that I've MS'ed and I'll never go back to my carb...

I also looked at the TPI setup but found it expensive.
The cheapest setup yet that I've found is TBI. I know it's not as good
as port injection but you can get an external pump,sensors and TB from
a junk yard cheap. The hardest part of your conversion would be a fuel return line. I'm running basicly the same setup but got a holley TBI.

The nice thing about this TBI is that it uses a square flange adapter
so you can use an inexpensive manifold. You would need this adapter when using a GM TB, avail through holley. This then gets you into the diy efi world cheap, and allows you to experiment.

You can get a Weiand Vortec EFI Stealth Ram Intake Manifold for only $350 at Summit Racing.

GotDart wrote:You can get a Weiand Vortec EFI Stealth Ram Intake Manifold for only $350 at Summit Racing.

True, but by the time you add in the Holleyyh-specific fuels rails and adjustable regulator, you'll be up to $550.

I'm only a few weeks away from that vortec Stealth Ram and some new Edelbrock E-Tec 200s.. I can't wait!

-Dave

I have a 350 in a camaro -74 with TPI and MS&E on the original Z28 engine. Not happy! Att around 4000rpm the fun ends. I have a single plane intake I soon will be mounting the injectors in and a holley 650 as TB. I will prabobly have it ready some time this spring. No hurry, snow is deep here in sweden....

Just another thought on the vortec head/efi intake setup...

http://www.sdpc2000.com/catalog/2657/pr ... ronics.htm

Pricey but comes with everything new. This is what I will be runnin on my 355. Priced out separately at gmpartsdirect.com it is insane. Course I have found all of the solutions for vortec heads end up costly in the end

Heres a pic of it from GM's crate engine. Looks sweet!

http://www.sdpc2000.com/images/products ... 535580.jpg