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Old 02-11-2003, 03:17 PM   #1
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LT4 Intake Part number/Casting number
Just picked up a brand new Lt4 Intake with casting number:
12550631!
Can someone support the fact that this is the Gm partnumber :
12550630???

Has someone bought the upgrade kit, sold from GM with all you need to convert from Lt1 to Lt4???

Is there any support to the rumours that Gm is discon. those parts????

Any LT4 swappers in here??
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Old 02-11-2003, 03:18 PM   #2
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another pic
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Old 02-11-2003, 11:56 PM   #3
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from what i understand the LT4 1255031 intake is an actual '96 LT4 vette production intake, LT4 intake with the 12550630 is the GMPP version

I have the 1255031 intake and a set of production LT4 heads on mine, which have LT-4 cast into them unlike the GMPP ones.
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Old 02-12-2003, 04:26 AM   #4
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Did you swap from Lt1 to LT4 ?
Or did you start right with the LT4??
Did you get the stuff new and are you 1/4 times a mega diff to those lt1 owners??
Did you rework the module??
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Old 02-12-2003, 05:57 AM   #5
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Got another picture showing the bottom side? I'd like to have a look at the ports.
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Old 02-12-2003, 05:10 PM   #6
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Hi John!
Thinking of a upgrade ???

Better pics on the weekend........
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Old 02-12-2003, 09:04 PM   #7
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Looking at the port size it is exactly like the L99 intake offered in the 4.3L V-8's of Caprices and roadmaster.

Unfortuently for you I believe you got a bad deal, not a LT4 intake. I have several of those laying around for 305 V-8 customers.

Sorry for the bad news. I hope I'm wrong.
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Old 02-12-2003, 11:23 PM   #8
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The LT4 intake will match up to Vortec heads right?
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Old 02-13-2003, 02:24 AM   #9
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Well you are cause we just received info that the casting number 12550631 is for the LT4 units!
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Old 02-14-2003, 05:21 AM   #10
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For those of you in need of a portet LT4 Intake:
EBAY# 2403586461 is the place!
This guy also has the 12550631 LT4 Casting!


For Lt4 owners that need real pro help contact:



John 'Hutch' Hutchinson
hutch@hashmarks.com
www.grandsportregistry.com
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Old 02-15-2003, 09:08 AM   #11
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I just brought it up German because here's L99 intake ports



and here's LT1 intake ports

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Old 02-15-2003, 02:00 PM   #12
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Quote:
Originally posted by John Millican
Looking at the port size it is exactly like the L99 intake offered in the 4.3L V-8's of Caprices and roadmaster.

Unfortuently for you I believe you got a bad deal, not a LT4 intake. I have several of those laying around for 305 V-8 customers.

Sorry for the bad news. I hope I'm wrong.

I was in a roadmaster ....it was a 350 !
also what is a 4.3 V8....I thought they were only 6's ...... and when were they in a roadmaster or caprice
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Reload this Page LT4 Intake Part number/Casting number
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