Subject: Re: [Tigers] 260 CID Cam

From: [email-masked]
Date: Sat, 2 Feb 2013 17:51:38 +0000 (UTC)

Just a friendly caution or two.. A cam is part of a package that needs to have compatible intake manifold, exhaust manifold, heads and carb for maximum performance. For instance, a cam that develops most of its power in the 3000 to 6000 rpm range probably needs exhaust headers and an intake manifold that can flow well up through 6000. Any cam recommendation needs to be gotten along with what mainifolds, heads, and carb are being used. 

If Art is still running the stock heads, hopefully he has installed screw-in rocker arm studs in place of the original pressed in version. (And with heads off, will be putting in hardened valve seats for unleaded gas...) Also, the original valve springs may have relaxed a bit over the years. They should be tested and replaced if necessary to get full performance out of a new cam. 

If he ends up picking from a catalog, and does not have fly cut pistons, there is some guidance in the old "Performance Tuning The Tiger" book on page 41 regarding cams. It says the maximum lift should be 0.440 inch and maximum overlap should be 56 degrees. It also says elsewhere that the slightly higher lift LAT 20 gets away with that because the maximum overlap is not exceeded. Obviously actually checking the valve to piston clearance by hand with modeling clay, as described in the book is a must do when installing any new cam is a must do. The book mentions 0.125 is desired with .080 minimum. 

In addition to looking at Comp Cams, Crane and Lunati are very worthy of consideration. 

Just my thoughts, hopefully of some value. 

Gene 

----- Original Message -----
From: [email-masked] 
To: [email-masked] 
Cc: [email-masked] 
Sent: Saturday, February 2, 2013 9:28:42 AM 
Subject: [Tigers] 260 CID Cam 

Art Bonsignore, owner of a 260 Tiger that has a Shelby American camshaft 
that was installed in his Tiger in 1968. It was described as a High 
Performance solid lifter cam with 0.450" valve lift and 272 deg duration. He wants 
to replace it with a slightly more aggressive hydraulic version. Do you 
have a suggestion I can pass on to him? 

John Logan 
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