Black/blue head

[mag]

Quote:
Originally Posted by TappetHead View Post
Sorry Andrew.
No it's Cast Iron, same specs as the alloy ones were 1.740" inlet and 1.550" exhaust valves, good size ports and throats, 56cc chambers, 240hp flow out of the box.
Cheers.
Mark.




Just wanted to ask while on this topic, is there any stamping or numbers on these 4 identification of a YT??

[TappetHead]

They are all stamped with a coded date of manufacture.
The YT castings have none of the GMH numbers and "PL" on the top near the rocker cover rail.

Cheers.
Mark.