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VIN "X" Cylinder Heads

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Old 03-12-2010, 09:06 AM
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Default VIN "X" Cylinder Heads

I am looking to upgrade my 95 4.3L with the 96+ heads.
I know there are several different casting numbers and I want to make sure I get the best head from the factory to work over real well.
If anyone knows of a resource to the casting numbers it would be much appreciated.

-Grant
 
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Old 03-12-2010, 10:13 AM
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Planning on re-machining them for the perpendicular intake manifold bolt pattern?
 
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Old 03-12-2010, 05:47 PM
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If you mean tapping the heads to accept my CPI intake then yes.
I also wonder if there is a plane angle difference where the manifold bolts to.
Kinda like the difference in LT1 and old school SBC.

My apologies for the double post.
 

Last edited by beatinPearls; 03-12-2010 at 05:50 PM.
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Old 03-12-2010, 07:52 PM
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I did a quick search for the differences between the v8 vortec heads and non-vortec heads. Many people just re-drill them for the perpendicular bolt pattern and that's it. Since these heads are just shorter versions of the v8 heads, I would think that would hold true for them as well. I plan on putting the vortec heads on my L05 that I'm putting into my '74.

Here's a quote for you:
Original - HotRod.com

According to the Cylinder Head Exchange, look for casting Nos. 772, 140, or 113. There's about a 50/50 chance the 113 heads will be machined for fully adjustable rocker arms; the other casting numbers as well as the remaining 113s come with nonadjustable positive-stop rocker-arm studs. Crane Cams offers an adjustable conversion stud (PN 99148-2, six required), but for serious work, all these should be drilled and tapped for V-8-type screw-in rocker studs and roller rockers.
 
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Old 03-13-2010, 01:00 AM
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thanks swartlkk for your help!
I will do more research on those castings, I owe you one.
 
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