Author Topic: any special name?  (Read 1918 times)

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Offline Sopcich04

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any special name?
« on: April 13, 2007, 11:52:32 AM »
is there any special name for a pontiac 400 engine? like the chevy 350 is an ls1/lt1 and i think corvettes had codes like L88(maybe).....just wondering on that

Offline chris189

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Re: any special name?
« Reply #1 on: April 13, 2007, 12:13:59 PM »
The base 400 Pontiac engine was called an L78 as the performance package that boosted it to 200 or 220 was called W72.  Hope that's what you were looking for.

Offline rkellerjr

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Re: any special name?
« Reply #2 on: April 13, 2007, 12:58:26 PM »
So my '77 400 base engine is a L78?
Rich

Offline chris189

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Re: any special name?
« Reply #3 on: April 13, 2007, 01:53:40 PM »
Far as I know, you have to check to passenger side front of the block right below the head for two letters stamped.  Then look on the net for what your letters mean, could be something like yx or yv, something like that.  Mine is a '78 with WC which means it IS a W72.

Offline rkellerjr

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Re: any special name?
« Reply #4 on: April 13, 2007, 03:16:40 PM »
Ah, gotcha, mines a Y4 then.
Rich

Offline kyledyr

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Re: any special name?
« Reply #5 on: April 13, 2007, 06:13:57 PM »
the LS1 and L78 and the such are called RPO codes, i believe.  rich, your RPO code IS a L78.  if someone had the "performance" engine, its called a W72.  my little chevy 305 is called an LG4.
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Offline ta78w72

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Re: any special name?
« Reply #6 on: April 13, 2007, 08:30:51 PM »
Both the "W72" and the standard are L78's, one has the performance package...but the same basic engine.

Offline John Witzke

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Re: any special name?
« Reply #7 on: April 13, 2007, 09:55:47 PM »
W72 was originally going to be called LS7
John Witzke