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I would pull the head. What Gnarly mentioned has a lot to do with why I feel this way about out it. Pulling the head isn't that much more work. Do it once and be done.

Pulling the head on 22RE is WAY more work and time consuming!! Gnarls.

I am not a fan of the dual row t-chains. First, it takes power to move them. With 2 chains there is twice the chance of a failure. And, thirdly chain breaks are not very common on the 22s.What is the engineering design objective of a dual chains? Gnarls.

With 2 chains there is twice the chance of a failure. And, thirdly chain breaks are not very common on the 22s.What is the engineering design objective of a dual chains? Gnarls.

With 248k on my 77's double-row chain it had zero stretch when measured, try that with a single-row chain. I'm runnin' a 22RE single chain and it was stretched when I replaced it, all the single-rows I've done required replacements. I've never had one that broke, though. Just my 2 cents.

The single row chain also cut right thru the tensioner block. (been there done that)Then there isn't enough tension and the timing chain skips some teeth advancing the camshaft timing. (BTDT)

What does twice the chance of not very common equate to?....just being a smart@ss, no offense Gnarls. I can see where two would split the force and result in less stretching and guide and tooth wear. Also, reduced chances of jumping a tooth, but you got other issues if that's possible with chain.

...With 2 chains there is twice the chance of a failure.

LOL.... yeah... with two chains you have 2X the force against the guides and tensioner.

There is twice the mass with 2 chains, so it takes more energy to move them, more torque applied to the crankshaft sprocket and therefore more parasitic power loss.

.... I am pretty sure those are not 2 chains, but rather 1 with two rows.

That's my physics-based opinion. IF you want to argue with me, I only listen to physics-based arguments

I feel the need to reply to share another view point.. T

...Assume the mass of a single row chain is X. Assume the mass of a duel row chain is 2X.Using Newton's 2nd Law of Motion..... would the [F]orce value be greater for the duel chain?If the Force is greater, would it take more energy to move the duel chain?Since the engine RPM is NOT constant, energy (power) that is required to move the chain is greater with a duel row chain.... thus the parasitic loss is greater.

Assuming the duel row chain creates more friction, if we add the friction.... we add more parasitic loss.

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