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Old 01-16-2007, 09:31 AM   #1
pack OP
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big valve heads on seibenrockr80/1000cc conversion, will they work?

a good question was raised in a previous posting, will RS 44mm/42mm heads work in conjunction with my recently installed seibenrock 1000cc-r80rt conversion? any mods i need to do first or is it just bolt on and go?
Thanks, Pack
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Old 01-16-2007, 11:09 AM   #2
Bernd Bauer
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Quote:
Originally Posted by pack
a good question was raised in a previous posting, will RS 44mm/42mm heads work in conjunction with my recently installed seibenrock 1000cc-r80rt conversion?
It is just bolt on. (If the other parts are stock, read no hot camshafts etc.)


Regards

Bernd
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Old 01-16-2007, 01:03 PM   #3
R-dubb
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Agreed.

You can use the Siebenrock asymmetrical cam, but can not use the BMW 336 without substantially modifying the heads. I would not use big heads unless you are also putting on big carbs.

Expect a somewhat fussier idle, a slight mid-range flat spot and stronger top-end. Throttle response with the big valves may not be as snappy but should pull harder overall if the intake and exhaust are opened up to match.
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Old 01-16-2007, 02:01 PM   #4
pack OP
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carb and exhaust changes will coincide with the head swap........then camshaft. just want to see what the old girl has to give.
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