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Old 01-05-2006, 09:17 AM
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Vortec heads on a 66 327 SBC

I'm not too sure about this. I heard Vortec heads are better for daily use, but what has to be done to use them? Do they bolt right on the an older block? Is there anything different on the intake?? Thanks!!

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Old 01-05-2006, 09:29 AM
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Yes they bolt on older blocks with no problems. Changes made will depend on your set up, if the cams lift is to be over .470 then the valve guide has to be clearenced so no interference problems occur. They also require self guiding rocker arms which come on these heads. The intake takes a 8 bolt pattern that is completely different than the classic 12 bolt design on the older small blocks. If you use vortec heads use the edelbrock vortec intake. If you are to use vortec heads off a production vehicle make sure they aren`t cracked, these heads are light casted, usually run them hot once and that`s it. also make sure they either have casting number 062 or 906 as there are alot out there pushing junk smogger castings and calling them vortec heads. The vortec bow tie heads being released by GM performance parts are much heavier castings but they cost a bit more.
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Old 01-06-2006, 11:47 PM
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You can get stock-type self-aligning rockers in a full set from GM for a lot less than buying 16 separate ones. The set runs ~$60 under part number 12495490.

Part number 12550027 is the attaching bolt GM makes for the Vortec intake manifold.
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