Looking for Input on boring 6.9 to 7.3

[riotwarrior]

Are the rockers the same ratio as stock?

In all likely hood yes, without being extremely careful with ratio's and cam lobe profiles and piston deck heights, one would need be very careful about changing that ratio and not having pistons and valves make passionate love to one another!

Just saying....

Tolerances stack up and stack up fast and usually NOT in a good way!!!!

That price is actually quite reasonable for what you are getting. 100 bucks a hole for a hell of a lot less friction and likely less guide wear too due to thrust imparted on stem from rocker arms.

I would suspect this would all together eliminate the guide wear issue we see.

JM2CW

Al

 

[icanfixall]

Now I want a set and to hell with the cost...

 

[bronco78idi]

Went to the machine shop to check on the build with Muddy74Ford. Here is the video update

http://youtu.be/B6Heh7-R9bo

 

[TahoeTom]

Subscribed. Thanks for sharing your build and pioneering the roller rocker for the IDI. Add me to the list wanting a set of these rockers. What ratio did you go with? Do they fit under stock valve covers?

 

[ksingltn]

subscribing. Might be looking at a set of these myself.

 

[bronco78idi]

Hey all here are more pic of the rockers, the ratio is stock however the stock push rods are to long. the new custom push rods are in I am going to video the install. IF you call Harlan Sharp tell them I sent you. Thanks

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[bronco78idi]

Here is pic of the engine

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[bronco78idi]

the Piston were cut down then sent to 300 Below to be cryo then sent to be ceramic coated. The rods were shoot peened and then sent to 300 below also. all my bearing were teflon coated. I used total seal do my 2nd groove.

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[bronco78idi]

Here is the Cam I purchase from R & D IDI Performance

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[icanfixall]

interesting build. am interested how rockers fit heads.

 

[OLDBULL8]

It would be interesting to know how they balanced the crank throws with all the changes to the rods and pistons. Looks like one hell'va build. Is the crank dampner pulley going to be changed when the turbo is added? Is there any changes made to the flywheel or flexplate depending on a manual or automatic trans? Just an inquiring mind.

 

[bronco78idi]

Hey all, Muddy74Ford and I spent the morning with the Harland Sharp Rockers being installed... GREAT DAY to be a IDI Thanks to Valley Balancing for a Great day and Job!!

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[bab029]

This engine needs one of Mel's ball bearing turbos when they become available. NEEDS.

 

[bronco78idi]

Here is the video of installing the rockers and then running the motor

http://www.youtube.com/watch?v=V8pSLSE4U6Q

 

[riotwarrior]

Un real. Now I'm all O M G I want those rockers...eliminate the guide issue I hope.

Have you checked to see where the rockers contact valve stem tip in the full travel of the rocker/cam? How centered are they should start closer to exh side then just over center to intake side of stem tip IIRC

These are just fantastic and I wonder if they will be a regular production item?

Keep us informed as to whats what.

Are you going to throw that on an engine dyno by chance? hint hint...