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They are advertised in most of the car/truck magazines. P-Ayr Engineering or something like that. They are pretty expensive for just an individual to purchase ( in the ads they suggest car clubs buying them ). They are used for setup purposes.
I recalled seeing the place that 54 5star is referring to, so I looked in my issue of Hemmings motor news.
Here's the contact info:
http://www.payr.com
Phone 1-800-322-3285
yep they have plastic engines and even transmissions they have threaded inserts in them so that you install headers intakes and i believe water pump and altenator power steering and such they have the heads molded to them great for fab work if you dont have a extra eng and they are lighter too my classic car show featured them last weekend
gee ooh