RWD Double Roller Timing Chain?

[3400-95-Modified]

HRMMMM... Too bad I don't have a 3500 block. Wonder if it fits a 3400... I can't see why it wouldn't.

It's only $22!

The only problem I see is it's designed for the thinner chain. I have the larger pre 2000 style on there because I have seen that last longer on my cam/springs than the 2000+ thinner version.

Decisions decisions....

[caffeine]

FWIW I ran the stock 06 3500 chain for 15,000 kms with the 26896 springs and although the chain had stretched it wasn't excessive

[caffeine]

Another thing you should look in to since you have a thicker chain is the tensioner that came on the 3.4DOHC. It uses a 3rd bolt hole to mount the tensioner but since the 3900 tensioner only uses two it might be fine with just the two bolts.

[SappySE107]

Im ordering the tensioner for the 3900 now The 3.4 DOHC is too thick for the gen 3 but maybe in a RWD setup? Its thick like the double roller.

[3400-95-Modified]

I was going to order it but I already have two DRTC's coming back to me and the pre 2000 setup lasted me 3yrs the 2000+ one I ran once only lasted about 10k miles and that was only on LS6 springs. When I went to the comp 986's I went with the bigger chain.

[1988GTU]

If I had known about that tensioner option BEFORE the DRTC, I'd have just went that route...

Money makes the world go round.

[3400-95-Modified]

They way I look at it though, the tensioner is NICE to prevent chain slap but it doesn't necessarily prevent chain stretch/wear... That can still happen due to the extreme loads by the cam and spring combo.

Going off the latest DRTC info I would love to have this as an option for that setup so it would tension the chain after it seats itself to fit the sprockets since I feel that it will begin to slap just a bit once it's all seated in.

[caffeine]

Yes it won't prevent the chain from stretching but it should prevent skipping teeth and chain noise when it does stretch.

[3400-95-Modified]

My DRTC chain was extremely loose in my engine to the point of quite possibly be able to skip a tooth, BUT the timing cover has it's own way to prevent that from happening... They chain wont physically fit between the sprocket and the cover without it seated in the tooth.



Excuse the language at the end, but I drove back from Colorado with it this bad. I think that's enough to skip and it didn't.

[1988GTU]

The tensioner would idealy add a passable sense of reliability if the stock timing components were heat treated for my application. Figure that that chain slack would stretch to a point that the tensioner should in theory keep in everything operation in order for a long period of time while the hardened parts would be expected to handle the added stress of the valvetrain.

[3400-95-Modified]

I ordered one and I plan on trying it with the DRTC setup and quite possibly modifying it to seat more centered on the chain if necessary since the DRTC is much wider.

We'll see how it all goes.

[ForcedFirebird]

Ford Modular motors use a similar tensioner and have extremely long chains that last pretty much forever. I really like that design. I am also 99% sure the bolt holes for the dampers did not change from iron head all the way to 3500 (have mix-matched chain dampers for test fit). the only difference I ever found was an alignment hole on the very early models and a tab on the early dampers that needed to be shaved off to use on later stuff. So, it should work on the 3400 if it works on the 3500.