Hello all! I'm finally building myself a 383 LT1 and I want alittle something different. I was thinking about doing a single plane conversion. Has anybody here done this? Now to be clear I don't want to do the whole elbow with a ls1 tb. I want to keep the old school look with the air cleaner resting happily in an open element style,lol. More of a multipoint efi deal like the Edelbrock Pro flo system. Can anyone give me an idea has to how to go about this?

 

Any SBC 4bbl EFI intake with bolt pattern changed to LT1 pattern
Plug hole for dist at rear

http://www.summitracing.com/parts/EDL-29785/
http://www.summitracing.com/parts/ACC-74139/
http://www.summitracing.com/parts/HLY-9901-101-1/
http://www.summitracing.com/parts/PFS-52039/


Buy 4 bbl TB
http://www.accufabracing.com/4_barrel.htm
http://www.summitracing.com/parts/EDL-3878/
http://www.summitracing.com/parts/HLY-112-577/

The previous owner of my Victor E intake was running it on a big Hp 383 LT1
Instead of welding and re-drilling the center bolt holes he tapped his heads to suit the reg pattern

 

That's exactly what I'm talking about!!! So I wouldn't have any issue other than the obvious distributor hole and drilling for the LT1 intake pattern? What intake is that? I might try to use the same one. Will the ports line up correctly?

 

Victor E
http://www.summitracing.com/parts/EDL-29785/

Ports are reg SBC.
May require slight gasket matching to suit
Mine was port matched to the GM LT1 #12367777 gasket

 

Now can i use the stock lt1 rails with that or do i have to get new ones to match?

 

Check out multiple LT1 single plane conversions here with their cost to build:

http://www.ls1tech.com/forums/lt1-lt...lane-pics.html

 

subed to findout more info on this setup!

 

As far as I can see you have to use the rails supplied by the intake maker

As a interesting side note;
Because he had the dist hole in the intake, the owner of my intake chose to run a MSD dist
http://www.summitracing.com/parts/MSD-84697/ (just a cap and rotor ; no electronics inside )

just to distribute the spark to plugs while retaining the Opti as the trigger for the stock spark control
Did away with the common HV problems associated with tracking inside the Opti

 

That sounds pretty cool, how did he get that to work? I might look into doing the same thing.

 

Opti has two parts.
The crank trigger for the ECM spark control and the actual " distributor" that send the spark to correct plug.
All you are doing is separating the components

As noted the MSD dist only has a rotor inside; no electronics

 

So it would hook up from the opti to the coil then to the distributor to fire? what would I do with the plug wire holes from the opti? just cap them off with rubber caps?

 

Nothing changes on the electronics.You just need a longer wire from coil to new dist at rear
Don't know you would have to anything about terminals on Opti. They are just blind terminals holes so no water could get into unit

 

For LT1

http://www.camaroz28.com/forums/showthread.php?t=784936

 

I'm bringing this one back from the dead to ask a few more questions. Does anyone here have any experiance with this throttle body?

http://www.summitracing.com/parts/ac...6/media/images

The reason I'm considering it is the TPS and IAC sensors are a direct plug and play. Are there any 4 barrel 1000cfm bodies that share this same quality?

Also I have a friend who might hook me up with a Victor Jr. carb manifold. How hard would it be to convert it to an EFI manifold? I found a lot of weld in bungs on ebay that would probably work.

 

My similar priced Accufab 4150 TB ( yet to install ) uses late LT1 electronics
http://www.accufabracing.com/index.p...cid=1&Itemid=5

but I just found this post indicating the LT1 TPS works backwards on the Accufab unit
http://ls1tech.com/forums/drag-racin...placement.html
so you need a TPS off a late TBI engine

Going to put my DVM on the TPS tomorrow to confirm operation

 

My apologies for not clarifying this but I'm not switching over to the lt1 style pcm, I'm going to reuse my EBL flash with the port mod and just install 8 new injector wires. That's why I was asking if the accel throttle body would work.

 

Not a LT1 PCM , but the LT1 IAC and TPS
The TB you list above and my Accufab unit both only have mounts for the late style LT1 units that use a smaller elec connector than the earlier TPI units.
IIRC wired the same so all that is needed is to splice on a new connector to suit

 

I have a 4150 tb ill sell you dirt cheap it has lt1 style tps on it already

 

How much?

 

Does it have provision for a IAC?

 

$150

 

pm sent dude lol

 

Doesn't look like it ill look at it later

 

looks like it may have to be added

 

I wonder how hard it would be to add the provision, anybody have any thoughts?

 

Visit the MegaSquirt info page, lots of info there about adding an IAC valve to a system without one. It would be easy, just drilling a hole in the plenum and tapping it and connecting a hose to it that goes to an IAC valve housing. I also have the Accell throttle body but in a 1000cfm or whatever. it uses a tbi style tps and ls1 style iac. The IAC valves on L98 vs LS1are identical in how they work or are powered, you just need to wire in the new connector, i did it and it works fine on GM efi ecms and MegaSquirt (0f course). If I recall, Amazon had the cheapest prices on the Accel single plane throttle bodies too.

 

I've been checking out ebay and I found this intake, has anybody ever used this one?
http://www.ebay.com/itm/330568618348...84.m1423.l2649
I also saw this but it too needs an external iac housing..
http://www.ebay.com/itm/180810415357...84.m1423.l2649

any thoughts on these?

 

https://www.thirdgen.org/forums/alte...ifold-too.html

 

I've been checking out remote IAC's and thats not a route I'd like to go. What could I do with this throttle body to make one work? I have a friend who could probably weld a bung on this so I could screw one in for free.My question would be where at on the body could I do this with?

 

You can really go without an iac valve. When MegaSquirt 1 came out had the car as my daily driver I ran without one on an HSR L98 in the winter and was fine. Even when I first start tuning something I don't use an iac valve until my spark and fuel maps are set well. So if you have the parts already I wouldn't worry too much. You can put one on there but it would be some drilling and welding and may or not be up to your standards. Again I really suggest going with an accel unit, not profab.

 

Ok then, i'll take your advice. I can't believe how expensive these blocks of aluminum go for,lol. From what I read on the "hurricane" thread that intake and rails might be the way I'm heading. I can port/clean up that intake fairly easily and for the price it doesn't seem like a bad unit. my biggest hurdle now is the throttle body and injectors. I have'nt decided whether to use 36lb injectors at 40psi or 42lb injectors at 30 psi. I checked the prices for injectors on southbay and damn near 400.00 bucks is kinda hard to swallow for injectors.

 

Go with a set of the newer bosch III style injectors. Get a set rated at 36 @ 3 bar and go with 40 psi. With the III style it's safer to crank them up and the pintle design of the IIIs are much more efficient than the old fat IIs which are just garden hoses. Don't get 42s and use 30 psi, you need more pressure for the injectors to work best. Check out : http://fuelinjectorconnection.com/sh...?productid=408
and a calculator at: http://www.megamanual.com/v22manual/minj.htm

 

So I've been checking out regulators and I've come across a few I'd like to run by you guys. Here's the first I've seen and I like it do to everything you get with it.

http://www.ebay.com/itm/ADJUSTABLE-7...c2f5ba&vxp=mtr

This one looks like basically the same one with out the extra fittings..
http://www.ebay.com/itm/320991544462...84.m1423.l2649

ANother that looks promising..
http://www.ebay.com/itm/170644025649...84.m1423.l2649

I tried to get a used Kirban this morning but got outbid at the very last second...literally lol. So what do you guys think?

I have one more question. The car already has an AC delco TPI fuel pump in it now, will it be enough to feed my engine or would I have to upgrade to a 255?

 

FYI That Procomp throttle body/intake on ebay DOES have prevision for an IAC and the LT1 IAC fits perfectly. I know this because mine showed up today and that's the first thing I checked.

Jerry

 

Pics or GTFO!!! Lol

 

I don't have a pic of the sensor mounted but I have 1 of the back of the TB. Will that work?

 

 

well damn, if I had known that I would've just got the package deal instead of buying the intake and rails separately. I'm using a modified 454 tbi unit for now.

 

Must be a new added feature to the Proform throttle body. I had one a few years back (7 years?) and it had no provision. Nice to see that they are listening to the public! Who was your seller on Ebay? I would like to see one that he is selling.

 

Those that you have listed may work fine, I don't know. They are brand name chinese made knock-offs. But then again the procomp is a chinese made knock off that is a fine intake! I went with the Aeromotive AFPR and have been very happy with it. Also for the Fuel pump I reccomend the AC Delco fuel pump used in the Typhoons and grand nationals part number is EP381. I use it after the good report/advice/findings of Dyno Don. It is a complete bolt in.

 

part number is what? lol. I'm running a stock TPI pump now.

 

Well it's time again for an update, I got the intake together and mildly ported ( I truthfully think this intake is FAR better than the Vic efi) and here it is...











To make a long story short I port matched EVERYTHING that bolted to this intake. The throttle body, adapter plate, spacer, carb base and intake ports. The ports are matched to the stock LT1 intake gasket which is ridiculously close to a 1205 gasket. I think in the whole intake I have just a touch over 500 in it.