LT1? intake casting 12551238
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Joined: Oct 2000
Posts: 249
From: Austin,TX
LT1? intake casting 12551238
I'm sure its been mentioned before but I searched and didn't see what I"m looking for.
I have an intake with casting 12551238 and I want to be sure it is an Lt1 casting and not L99.
Does anyone have a link with casting numbers or maybe confirm they have the same intake? I looked at the Mortec site and didnt' see any info for intakes
Thanks
I have an intake with casting 12551238 and I want to be sure it is an Lt1 casting and not L99.
Does anyone have a link with casting numbers or maybe confirm they have the same intake? I looked at the Mortec site and didnt' see any info for intakes
Thanks
Registered User
Joined: Feb 2004
Posts: 1,154
From: VA
Re: LT1? intake casting 12551238
If the ports are a rectangle, then it's a 5.7l intake. If the outside port walls aren't straight up & down it's for an L99.
Registered User
Joined: Feb 2004
Posts: 1,154
From: VA
Re: LT1? intake casting 12551238
An L99 is 12552138.
Thread Starter
Registered User
Joined: Oct 2000
Posts: 249
From: Austin,TX
Re: LT1? intake casting 12551238
thanks for the snappy response.
your posts had me going back in the garage and double checking the numbers.
I would have helped if I wrote down the number correctly in the 1st place.
12552138
Story is the engine came off a C4 corvette (dont' know which year). I bought the heads too and they have 12551561 and decode as '96 LT1.
So ASSuming this was the stock LT1 corvette engine then this intake came on a '96 LT1 supporting the comments about finding them on some LT1 cars.
The guy had a 4-bolt and 2-bolt block, I'm checking to see which one these came off of (I forgot) if 4-bolt it will fit the corvette story better. but 2-bolt it definately didn't come in a C4.
I measured the port opening heights on the heads and intake. both were 2" tall. Shapes of all the intake and heads port openings were the same for all, none were square, narrower at the top by ~1/16".
heads were 1 1/16" wide at top and 1 1/8" wide at bottom, intake ports were 1" wide at top and 1 1/16" wide at bottom just past the corner radii. Crude measuring.
your posts had me going back in the garage and double checking the numbers.
I would have helped if I wrote down the number correctly in the 1st place.
12552138
Story is the engine came off a C4 corvette (dont' know which year). I bought the heads too and they have 12551561 and decode as '96 LT1.
So ASSuming this was the stock LT1 corvette engine then this intake came on a '96 LT1 supporting the comments about finding them on some LT1 cars.
The guy had a 4-bolt and 2-bolt block, I'm checking to see which one these came off of (I forgot) if 4-bolt it will fit the corvette story better. but 2-bolt it definately didn't come in a C4.
I measured the port opening heights on the heads and intake. both were 2" tall. Shapes of all the intake and heads port openings were the same for all, none were square, narrower at the top by ~1/16".
heads were 1 1/16" wide at top and 1 1/8" wide at bottom, intake ports were 1" wide at top and 1 1/16" wide at bottom just past the corner radii. Crude measuring.
Last edited by y5e06; Sep 6, 2006 at 10:16 PM.
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Joined: Feb 2004
Posts: 4,800
Re: LT1? intake casting 12551238
People REALLY need to stop thinking the L99 is so different, it is not. I have an L99 intake on my car and it seems to run fine. AI did port it but stock it matched reasonably well just like an LT1 intake. The forum I posted the port measurements on is down at the moment so I can't retrieve them at the moment but they are fine.
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Joined: Feb 2004
Posts: 4,800
Re: LT1? intake casting 12551238
I have the L99 heads yet and just to give an idea the ports are 2.00 tall, 1.080 wide at bottom and 1.015 at top.
I have two different untouched LT1 iron casting numbers and both are just thousandths bigger in width and the same height.
I have two different untouched LT1 iron casting numbers and both are just thousandths bigger in width and the same height.
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