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Terb Grubmeel Terb Grubmeel is offline
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Join Date: Oct 2005
Location: Calgary, Alberta Canada
Posts: 185

Thanks for your note re. the "911S" pistons. I purchased the pistons and Biral cylinders from a person I know, who told me that they came from an early 911S. I then cross-referenced them with Bruce Anderson's Performance Handbook, p. 108, where I found the 901/01 engines had I 39, E 35 mm valve sizes. So it appears that they are not from an "S" but an early 911...

I don't know how to tell if the pistons are forged or cast, are there indentifying marks inside the piston?

Thanks again very much for trying to help!

Air Cooled

T. G.
1974 Carrera
1958 CAB
911 Engine


Thanks for your offer of the Cosworth (great make!) high compression 2 Liter pistons, but I am now re-evaluating the entire project... I will keep your info incase I change may mind!

Thanks again for contributing to this forum!


1974 Carrera
1968 Porsche 356A Cabriolet/hardtop
911 Engine
Old 10-06-2005, 12:32 PM
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