Topic: How to tell the difference between a 350F and 400F head?

[magconpres]

I have a head that I think is for a 400F, but could be for a 340F.  No numbers stamped on it.
How can I tell the difference?

[MaaseyRacer]

On the front it should be stamped 408cc or 347cc.

[ttr400]

CB400F has 4 full fins up to the spark plug hole, 350F has 3. 350F has vertical fins at the front. 350F has a extra fixing at the back of the head to bolt to the block, M6 screw. 400F does not have any.

Bore size is only on the block not the cyl head.

Kevin

[magconpres]

Thanks.
So the head I got is a CB400, but the carb insulators bolted to aren't for a CB400.  They are very shallow and domed instead of looking like tubes.  I'llpost a pic later and see if anyone can identify them.

[Kevin400F]

The "shallow, domed" carb insulator description sounds like you might still have the base of OEM insulator but the rubber tube has disbonded and come off.

[magconpres]

Kevin,
You're probably right.  I didn't realize the insulators where constructed from two pieces.
I'll post a pic once I get batteries for my camera.