mpe331lx

iTrader: (5)

I have ran into a small dilemma with intake selection form my LT1 build.

I am building a forged 383 with an AI H/C package (200cc Dominator).
I have two intakes one is a 94 casting # 10108630. The other is a 97 casting # 12552138. According to some people the 12552138 is an l99 intake. But it seems that it comes on all lt1s that had 561 heads too.

I have read that the 138 intake has better port allingment when used with stock heads. The 630 has perfectly rectagular ports that do not match the stock ports very well.

I just noticed the difference tonight. I was about to box up my 97 intake and send it to AI, when I noticed the port difference between the two. I have been reading abot them for a little while now, but have not found the answer that I need.

Which would be the better inatke to send to AI to be ported? I was just going to have inlet work done to it, but I may have the runners done too.

Which ever intake I dont send will be going on a stock 97 LT1 with 561 heads. (I am putting a stock engine in the car until the 383 is done).

Here are a few pics of the two itakes. The 97 intake is the red one.

Paul Bell

iTrader: (9)

Send both to AI and let them decide.

GIZMO

iTrader: (8)

IMO, the best intake is the 1993, but you ill have to modify your fuel rails. If you weren't porting, I would run the 138. But, as you are porting, you can send either one of the two that you have. If you want a 1993 intake I will trade you straight for the 138 (I am not allowed the 1993 casting in my Stocker any more).

Good Luck,

Daren

mpe331lx

iTrader: (5)

What exactly do I have to do to make the 93 intake work?

GIZMO

iTrader: (8)

You don't have to do anything to the intake. You have to remove the crossover from the fuel rails, plug the holes (tig weld), remove the o-rings in the end caps, weld the end caps back in, and weld 6 AN fittings to the top of the fuel rails for a new crossover. Sounds complicated, but it's not. Any experienced welder should be able to do it in a couple of hours.

fergymoto

iTrader: (129)

I had this done before, it took the guy about 20 minutes.

mpe331lx

iTrader: (5)

Thats pretty much what I expected with the crossover. Just wanted to make sure there would be no more suprises.


I have a couple more questions if you dont mind answering them.

In as stock aplication, does the 138 intake perform better than the 630?

Does the 93 intake perform better because ther is no crossover impeding flow, or is it because of somthing else?

fastburn

im building a lti too and have both intakes mentioned.
the 630 intake ports look alot squarer and straighter.with some light porting i think ill be running the 630 over the 138.

chu thank?

LT1_freak!

iTrader: (8)

do like i did lol! get the Edlebrock high rise then have them match port that to the heads i'm happy with it... but if you didn't want to do that just send both to them and have them choose

GIZMO

iTrader: (8)

The 138 is a few hundreds faster on my Stocker.

Nail on the head! Less restriction directly behind the throttle body. When I was running an LT4, I actually cut the top off the intake and built a new flat top.

GIZMO

iTrader: (8)

The 138 intake and a stock LT1 head.