Chevy rocker arms...
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
Chevy rocker arms...
I've been reading about the chevy rocker arms on Ford 300's. Does anyone have knowledge of this--how much further they allow the valves to open? And what would that translate to if you had, say, a 260 duration cam? With the chevy rocker arms, would it be like having a 262, 264, 266 cam?
Also, for a 78 300, what year and model chevy would the rocker come from. I'm assuming it is a bolt on operartion?
Thanks for the help.
Also, for a 78 300, what year and model chevy would the rocker come from. I'm assuming it is a bolt on operartion?
Thanks for the help.
Posting Guru
Joined: Jan 2005
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From: The Vieux Ford, Kansas
No change on duration only a change in lift. Say you have .3125 lift at the lobe a stock 300 rocker is 1:1.6 so you have .500 valve lift a BBC rocker is 1:1.72 so you get .5375. I have never done this swap on a 300 before but that is basically how it works, it doesn't change when it opens just how much. There is a good chance you will need custom pushrods to get the geometry right. Studs and guide plates will be required.
-Johnboy
-Johnboy
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Lead Driver
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From: Near Los Angeles
French Town Flyer--Chevy rockers rock
On another forum I was reading a great article about a racing 300, how to build one for more power.
He said that by using the rocker arms off a 230--260 Chevy I6 you get 10% more valve lift!!
He said that by using the rocker arms off a 230--260 Chevy I6 you get 10% more valve lift!!
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
It is not something I am planning on using. However, I do find it fascinating that it can be done.
Good point, Dusty, about the wear.
Hey, my build is fine for me...plenty of power when I need it, and decent mpg too. It's everything I wanted. AND THIS TIME THE OIL PRESSURE WILL NOT DETERIORATE!!
Good point, Dusty, about the wear.
Hey, my build is fine for me...plenty of power when I need it, and decent mpg too. It's everything I wanted. AND THIS TIME THE OIL PRESSURE WILL NOT DETERIORATE!!
Postmaster
Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
The Chebby rocker trick is a cheap upgrade to an engine with a stock cam. If one wants to factor in more lift with a bigger cam it is usually best to do it with a higher lift cam rather than adding the Chebby rockers to an already bigger cam...essentially what dusty said.
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