Topic: CB 750 cylinder head - please identify

[Sgt.Pinback]

As told in my intor, if have got a lot of spare parts with my 1970 CB 750.

E.g. there are some cylinder heads. Some have a stamp ("300") others do not.

To which year do thís one belong to?

[Elan]

according to hondachopper, 69-71...

http://www.hondachopper.com/engine/engine_timeline/timeline.html

[Sgt.Pinback]

And those without stamp?

[Elan]

And those without stamp?

I've been wondering about the stampless myself. I have a stampless one...

[markb]

I have a stampless one...

Does it have that extra hole in between the 2nd and 3rd exhaust ports?  The sandcast heads (and cylinders) don't have that hole.  I believe they were changed sometime in the early diecasts.

[Sgt.Pinback]

Is the "300" stamped head a unique K0- diecast head or the same head on K1-K6?

[City Boy]

Hi.I am not sure what year head your pic shows but they are not 69 or 70.Those years had no oil restrictors but merely a drillway leading to cam towers.

[Jerry Rxman Griffin aka MuthaF'er]

It is not a 75/76/77/78 F or a 77/78 K

[Sgt.Pinback]

another pic of that head

[ekpent]

A side picture of the head showing the fins and the support bars may be helpful also.

[Sgt.Pinback]

Voilá

[754]

He meant fins on edge of head, but by the top front fin I can clearly see it is 73 or later.

[Sgt.Pinback]

which edge........

[754]

Look at the side of the cylinder hed early has round bard later has oval.
 Top front fin edge the early have a curve in the. Right and left sides, the later is 3 straight lines.
 Got to run but will post quick pic.

[754]

Like this

[Garage_guy_chris]

Like this

what is considered early and what is considered late? it would appear my 74 has an "early" style head the more i find out the more this bike has some odd modifications...

[754]

Early style ran till end of 72 , ans a few early 73 models

[HondaMan]

It appears to be a late K3 or K4 head.