T350 cylinder variations

[jabcb]

The T350 has two different part numbers for the cylinders.
One number for the 69 model & one for the 70/71/72 models.
Anyone know how the cylinders differ?

[Suzinut]

The later cylinder for 1970 -72 has two extra auxilliary ports next to the exhaust.

[jabcb]

Thanks.

That explains the change in carb jetting they made for the later-version cylinder.
Also makes it easy to check to see if a cylinder is the early or later version.

I have a bad left cylinder.
If I find an early left cylinder, then I just need a piston set.
For a later-version cylinder, I'll need both cylinders, piston set, and late-version jetting.