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Old 27th November 2021
unscrambled unscrambled is offline
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Default 1100 bathtub heads on a 883?

Wondering who has done this? How was it?


I just received what I was told were 883 heads but they are in fact 1100 heads, sand cast with a golden tint color, mint unmolested condition, original valves, original valve job

Front 16663-87
Rear 16662-87

3.111 long way (front to back) across the chambers

intake valve -1.600
exhaust valve -1.365

Measured over carbon so not precisely exact. Carbon pattern indicates they were last used on a 3 5/8 bore motor

Edit: Now I'm thinking they are 883 heads. Because they are larger than the bore by about 0.055 front and back it didn't seem right!..
I could relieve the tops of the cylinder bore this small amount to match the heads. In fact I have 1200 valves in it now and needed to relieve the cylinder a bit for the 1200 valves to clear.
This was done back in 91 and I don't remember how much I relieved the cylinder or how much I reduced the head O.D. of the 1200 valves if at all, but I must have. All is good I guess

Last edited by unscrambled; 27th November 2021 at 02:36..
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Old 27th November 2021
Tomcatt Tomcatt is offline
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Lay an 883 head gasket on the heads in question. It should be obvious if they're 883 or 1100 heads.

There are pics of the '86 883 & 1100 bathtub chamber heads along with their valve sizes here: http://www.hammerperf.com/ttxlheads.shtml
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Last edited by Tomcatt; 27th November 2021 at 04:59..
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