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Summit Racing™ Vortec Cylinder Heads
https://www.summitracing.com/search/part-type/cylinder-heads/product-line/summit-racing-vortec-cylinder-heads
Summit Vortec Heads - Team Chevelle
https://www.chevelles.com/threads/summit-vortec-heads.592545/
You can tell from the specs on the Summit head that it is different than the GM vortec head. Instead of 64cc chambers and 170cc intake runners, it has 67cc chambers and 165cc intake runners. I've read that the Summit vortec head is a Dart product. It has the Iron Eagle SS 165 cc intake port with a vortec intake bolt pattern.
GM vs Summit Vortec Heads | Hot Rod Forum
https://www.hotrodders.com/threads/gm-vs-summit-vortec-heads.264858/
The vortecs were a great oem head 20 years ago. You can get a much better head now. If you get them for free or dirt cheap then they do well, not worth putting any money into though. Btw they'll all need springs to match your cam and oem ones will need guide work. They may also need a valve job. Save Reply spinn Registered Joined Oct 16, 2004
Summit Racing™ Vortec Cylinder Heads SUM-151124 …
https://www.summitracing.com/parts/sum-151124/reviews
They are rated at 110lbs at 1.700 installed height. Well that would be great if they were not installed at 1.830!! Hope your running a small camshaft in these. You cannot upgrade to beehive springs because the valve spring land is not large enough to support a spring over 1.260 outer diameter unlike a factory vortec head. You get what you pay for.
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