t35 heads

[flea]

are the t35 mark 1 and mark 3 and /or 4 interchangable..thanks

[eddie]

Mark 1 heads and barrels are different from the later models.

Eddie.

[flea]

so to use later heads would have to replace the barrels as well

[eddie]

Yes, you need to change everything - heads, barrels, pistons, valve gear, pushrods and rocker covers!

  Eddie.

[flea]

so everything from the cases up ???