Checked your timing gear?

There is a flaw in the logic. The flaw is:

It only takes so much to turn the cam and valvtrain on type A (318) engine, if you take the valvetrain and put it in type B (360), even though the engine makes more power at the crank, the cam and valvetrain use the same power, because the cam gear is so light, and the cam is so skinny, there really is no rotational force, so the chain is always slack to one side. No matter what engine it is on.

UNLESS..........

The idle is low.
The idle is lopey, and too low.
Herky Jerky four speed driver.

If anything, the heavier crank of the 360 would make things smoother on the inside, therefore, making the chain last longer.

And it has been from my experience, that the 318 winds faster, and decelerates faster, in stock form. That would be rougher on the chain, than the slower reacting 360.

I think the chain not lasting as long in a 360 is a wives tale....... or, "motoheads" tale...... Whichever you prefer.

Now quit flipping me off. :thebirdm: