IDIT Performance Build
Posting Guru
Joined: Sep 2011
Posts: 1,523
Likes: 5
I have seen a dyno of a Cummins that had Harland-Sharpe roller rockers and the peak power and torque difference wasn't huge but the difference down low was actually pretty big. The dyno didn't start until around 2k rpm but the space between the old dyno was pretty big. I don't remember the exact numbers but it was pretty eye opening...
Posting Guru
Joined: Sep 2011
Posts: 1,523
Likes: 5
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Senior User
Joined: Feb 2012
Posts: 445
Likes: 6
From: western Oregon
Very Nice....The Improvement in Accuracy and stability will be measurable but not a Big power mod. If you did back to back engine dyno runs you would see a difference in performance over stock Mostly its for reliability and pure coolness... You win just because nobody has them.
Lead Driver
Joined: Apr 2008
Posts: 6,945
Likes: 13
Exactly, and that is an issue especially for the 7.3. Wont see anymore cracked / chipped valve tips anymore i bet.
Freshman User
Joined: May 2013
Posts: 29
Likes: 0
From: Redding, CA
beautiful, those should definitely add some valve train accuracy, should be able to pull more rpm out of it.
so since you had these made is there some data for them, can they be reproduced fairly easily now?
would you mind posting a cost?
so since you had these made is there some data for them, can they be reproduced fairly easily now?
would you mind posting a cost?
Thread Starter
|
Senior User
Joined: Mar 2008
Posts: 225
Likes: 2
Harlan Sharp makes them, you can get them in 1.5, 1.6, and 1.7 ratios.
As far as cost you would have to call them and get a price now that they have made a set.
The main reason for me in buying them was for reducing the stress on the valve terain. I have lost an engine before after breaking off a valve tip sending the valve into the engine. The price of the rockers is less then the cost of getting my truck hauled back home from a great distance away so it makes economic sense to me. Not to mention the cost of repairs from such a failure.
Last edited by xcite; Jul 24, 2013 at 08:25 PM. Reason: spelling
Senior User
Joined: Jan 2011
Posts: 275
Likes: 0
new diesels now are running valve releifs in the pistons in aftermarket pistons and such for valvetrain. Well this lead for more options for us via airflow/cfm? without extensive head modifications? I know racin was looking into his heads upgraded, but what about a high lift motor on high engine compression?
thoughts
thoughts