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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | Joined: Feb 2011 Posts: 583 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 583 | Picked up a set of Barker Chevrolet High Lift Intake Rocker Arms from an estate sale. NOS in box. Box says they fit 41 through 52 Std. Any info from you folks on these. Also picked up an AC fuel pump with the glass bowl that was NOS as well.
Rick
1939 Chevrolet Stake Truck
| | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | What's the rocker arm ratio? I'm adapting a 216 head to use stud mounted roller bearing rockers for a big block Chevy V8 with a 1.7:1 ratio.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2011 Posts: 583 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 583 | Instructions don't say Jerry what the ratio is.
Rick
1939 Chevrolet Stake Truck
| | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | You can probably figure out the ratio with a couple of dial indicators and something like a deep socket to use as a pivot point. The intake valve to piston clearance can get really critical, depending on the lobe lift of the cam you're using, and which cylinder head you have. It's impossible for an exhaust valve to contact the piston.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: May 2016 Posts: 268 'Bolter | | 'Bolter Joined: May 2016 Posts: 268 | Check the rocker arms for any markings they may have the ratio stamped on them somewhere
1949 gmc 1-ton | | | | | Joined: Sep 2009 Posts: 5,819 Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT | | Gearhead, Stovebolt Tech and Parts Tracker, Mod for Swap Meet and GTT Joined: Sep 2009 Posts: 5,819 | Rick, The "Barker" high lift rockers were once discussed on Stovebolt in this many moons old thread, but nowhere in it does it mention a specific ratio. A bit of further web searching came up with this old "Inliners" conversation that provides a bunch of details on the "Barker" rockers. The "Inliners" poster "stock49" mentioned that the ratio was 1.7 on the "Barker" rockers and provided a bunch of other info and references to "California" Bill Fisher's speed manual as a source of info too. Here is a link to a Sample from the manual which is available as a reprint according to THIS LINK in case anyone is interested. Hope this helps answer your question.  Dan
~ Dan 1951 Chevy 3 window 3100Follow this story in the DITY Gallery"My Grandpa Carl's Truck and How it Became Mine"1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
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