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Author Topic: Engine code X7 ???  (Read 3567 times)

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Offline brooksman9

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Engine code X7 ???
« on: May 17, 2007, 11:09:01 AM »
What does pontiac engine code X7 mean? Supposed to be on a 400 block. Only reference I found was to a 350. Anybody else know?
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Offline Tbird

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Re: Engine code X7 ???
« Reply #1 on: May 17, 2007, 11:26:58 AM »
The engine code in 72-74 was on the 455 engine. What year is the engine you have?
Is this number on the engine or the vin.?
Engine codes in 78 are
A=231
K=403
L=350
U=305
Z=400
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Offline brooksman9

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Re: Engine code X7 ???
« Reply #2 on: May 17, 2007, 11:51:45 AM »
Don't really know. It is in a 79, which I know 400 only came with 4 spd and it is an auto car so I ma asuming it is not original motor. Was trying to find out what it came out of. May have to ask him to get mor info. "X7" was all he sent so far.
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Offline Tbird

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Re: Engine code X7 ???
« Reply #3 on: May 17, 2007, 01:34:18 PM »
Ask for the VIN number and info off of the cowl plate. That will tell you alot about the car except for what has been changed if anything.

He could be thinking that 6.6 has to be the 400 but the 403 was also listed as 6.6
Have you looked at it in person? The 403 has engine code "K" which could be mistaken for a "X".
Do you have pictures of it or are you looking at it in person?
« Last Edit: May 17, 2007, 01:40:51 PM by Tbird »
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Offline brooksman9

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Re: Engine code X7 ???
« Reply #4 on: May 17, 2007, 02:03:05 PM »
Only pics. Is defintely a 350 or 400 (or 455). Not a 403, no oil filler in front. Looks to big to be a 301. I'll call him and get some more info. Car is in KC, MO. I am in MS.
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Offline brooksman9

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Re: Engine code X7 ???
« Reply #5 on: May 17, 2007, 07:00:34 PM »
Thanks Hammer, That is what I was looking for. Looked all over when I should have looked here first.
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Offline brooksman9

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Re: Engine code X7 ???
« Reply #6 on: May 20, 2007, 09:09:18 PM »
Quote from: Hammer on May 17, 2007, 06:16:32 PM

P.S. You also get 91cc's heads with that code too .

Are those good heads? Looking a little more seriously at this car now.
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Offline TransAmGuy

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Re: Engine code X7 ???
« Reply #7 on: May 20, 2007, 09:27:05 PM »
Quote from: Hammer on May 20, 2007, 09:23:06 PM
Quote from: brooksman9 on May 20, 2007, 09:09:18 PM
Quote from: Hammer on May 17, 2007, 06:16:32 PM

P.S. You also get 91cc's heads with that code too .

Are those good heads? Looking a little more seriously at this car now.
They're huge!  Largest cc's for that year.  So I guess they would be considered the best.

  Is that correct?  The X7 had the 6X4 at 91cc and the L78 had the 6X8 at 98cc.   Or am I off base? The smaller the chamber, the higher the compression?

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Vance

1978 Trans Am
1987 GTA
1995 Grand Am
2003 Grand Prix

Offline TransAmGuy

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Re: Engine code X7 ???
« Reply #8 on: May 20, 2007, 09:40:30 PM »
LOL.......that'll probably be my only chance to contribute.  The rest of the time I'll be asking questions......  :)

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Vance

1978 Trans Am
1987 GTA
1995 Grand Am
2003 Grand Prix

Offline wheels78ta

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Re: Engine code X7 ???
« Reply #9 on: May 20, 2007, 09:47:09 PM »
Looks like common kissy butt tactics to get in good with the senior members......hmmmm........does it work?     ;D
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1978 Y88 W72 WS6 4-SPD 79,000 miles
1987 Chevy K5 Blazer 7.4L Vortec 4x4
2005 Chevy Suburban 2500 8.1L Vortec 4x4
2006 Chevy Silverado Z71 5.3L Vortec 4x4

Offline TransAmGuy

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Re: Engine code X7 ???
« Reply #10 on: May 20, 2007, 09:48:52 PM »
Quote from: wheels78ta on May 20, 2007, 09:47:09 PM
Looks like common kissy butt tactics to get in good with the senior members......hmmmm........does it work?     ;D

I'll let you know......  :)
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Vance

1978 Trans Am
1987 GTA
1995 Grand Am
2003 Grand Prix

Offline Amtrak

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Re: Engine code X7 ???
« Reply #11 on: May 21, 2007, 12:59:36 AM »
Its the 1978 X7 W72 220hp version for the automatic  transmission its the last of the v8's phase 4 heads nitro the blower look at the blower
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