Author Topic: Twin cooled heads  (Read 358 times)

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Offline speed limit

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Twin cooled heads
« on: February 12, 2018, 06:54:13 PM »
Can 110 twin cooled heads be used on 103 rushmore.
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Offline Scott P

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Re: Twin cooled heads
« Reply #1 on: February 14, 2018, 10:49:08 AM »
Unsure about a Rushmore, but those can certainly be used on a garden-variety 103".
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Offline Lone Ranger

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Re: Twin cooled heads
« Reply #2 on: February 14, 2018, 03:23:14 PM »
Why wouldn't they? I believe twin-cooled are used in a Rushmore.

Offline Gerry Smith

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Re: Twin cooled heads
« Reply #3 on: February 15, 2018, 03:38:20 AM »
 Are you going to use a big bore kit? If not why put on the bigger heads? I went with the 103 inch heads and had them ported.  I am going with a S & S 106 inch big bore kit. The cam I bought is a Cycle Rama 575. I think the 110 Twin cooled heads would have to big of valves and might have a larger combustion chamber. If so it would drop your compression and make less power. Just my thoughts! Best to ask a head guy that has work on both set of heads.
 :gob:
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Online Bigbluff

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Re: Twin cooled heads
« Reply #4 on: February 15, 2018, 08:15:39 AM »
Are you going to use a big bore kit? If not why put on the bigger heads? I went with the 103 inch heads and had them ported.  I am going with a S & S 106 inch big bore kit. The cam I bought is a Cycle Rama 575. I think the 110 Twin cooled heads would have to big of valves and might have a larger combustion chamber. If so it would drop your compression and make less power. Just my thoughts! Best to ask a head guy that has work on both set of heads.
 :gob:

Correct. 110 heads have much larger combustion chambers than 103 heads.

110 wet head stock compression = 9.2:1
103 wet head stock compression = 10.1:1
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