Pushrod Dia - 3/8" - Will it work?

[Jerryl]

Anyone ever install 3/8 dia pushrods on a 109 - iron heads - stock rockers?
If you did, was anything special required to make them fit?

 

[Major Nutz]

just double checked. they were 5/16". sorry

 

[Mike Licht]

They will fit, what cam and springs?
Mike

 

[Jerryl]

They will fit, what cam and springs?
Mike

Mike,
I am using the XR1 with Beehives, +0.050 keepers.
Is there a clearance issue with 3/8"?

 

[Mike Licht]

With a 1.55 rocker you might be ok but it could get tight on the head. anything more on the rocker will likely rub. That lobe is pretty friendly, the spring is good, and the retainer is light I do not see much if any gain switching from the 5/16
Mike

 

[Jerryl]

With a 1.55 rocker you might be ok but it could get tight on the head. anything more on the rocker will likely rub. That lobe is pretty friendly, the spring is good, and the retainer is light I do not see much if any gain switching from the 5/16
Mike

Mike,
Going to adjustables to set all the preloads at the Spec +-0.003
Too much variation for me otherwise.

 

[Mike Licht]

3/8 adjustable will be very tight. I used to be that crazy but not any more.
Mike

 

[49-blues]

Kenne-Bell used to sell a stronger 3/8" rod with a 5/16" head-im using a set on my iron headed 6109 block now.

 

[Jerryl]

Kenne-Bell used to sell a stronger 3/8" rod with a 5/16" head-im using a set on my iron headed 6109 block now.

What rockers are you using?
Please let us know if you run into clearance issues.

Edit;
Going with 5/16"

 

[49-blues]

T&Ds 1.55 on new champion CNC iron heads -no issues.

 

[Blown&Injected]

I did it on a 109 with stock/ported heads. I had to do some grinding on most of the holes.

I used some cardboard packaging - I think from a strike anywhere box of matches, to roll around the PR as a guage.