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Coyote Series Engines
Mustang cams - piston to valve clearance
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<blockquote data-quote="hasty" data-source="post: 12652843" data-attributes="member: 145830"><p>I believe the Comp stage 3 is 286* of duration and 11mm lift Vs. 290*/13mm on the Cobra jet. The intake cam is virtually the same as a stock GT/Boss though, having only 1mm more lift and the same duration. The ramp rates may be a lot more aggressive on the comp grinds though. I know the Cobra Jet stuff is rated to withstand Ford's 150k mile durability standards.</p><p></p><p>I think it's interesting that Ford did not use a significantly larger intake camshaft on the Cobra Jet. They said they didn't find a lot of power increasing the intake side. I suppose it makes sense considering how weak the exhaust port is in comparison to the intake side. The Comp grinds are certainly a big departure from what Ford decided to do in the Cobra Jet program. There are people making over 500 RWHP on motor with the Comp stage 2 stuff, so it can't be too bad <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>The N/A Cobra Jet is supposed to be 12:1, so I knew the piston is a little different than the Boss piston. Well, that and the bore size is bigger on the Cobra Jet. That's a little unfortunate that you lose .020" of the margin of safety using the Boss piston.</p><p></p><p>It seems like everyone with any information is giving the green light on the Cobra jet exhaust cams though.</p><p></p><p>I don't remember the part number, but ford also grinds a cam that's 290*/11mm lift for use with GT heads that haven't had clearance added for the rocker arm (basically a "low lift" Cobra jet exhaust cam). That might be worth while if a person was worried about durability, or didn't want to do any machine work. I doubt there would be a major drop in power vs. the actual Cobra Jet cams.</p></blockquote><p></p>
[QUOTE="hasty, post: 12652843, member: 145830"] I believe the Comp stage 3 is 286* of duration and 11mm lift Vs. 290*/13mm on the Cobra jet. The intake cam is virtually the same as a stock GT/Boss though, having only 1mm more lift and the same duration. The ramp rates may be a lot more aggressive on the comp grinds though. I know the Cobra Jet stuff is rated to withstand Ford's 150k mile durability standards. I think it's interesting that Ford did not use a significantly larger intake camshaft on the Cobra Jet. They said they didn't find a lot of power increasing the intake side. I suppose it makes sense considering how weak the exhaust port is in comparison to the intake side. The Comp grinds are certainly a big departure from what Ford decided to do in the Cobra Jet program. There are people making over 500 RWHP on motor with the Comp stage 2 stuff, so it can't be too bad :D The N/A Cobra Jet is supposed to be 12:1, so I knew the piston is a little different than the Boss piston. Well, that and the bore size is bigger on the Cobra Jet. That's a little unfortunate that you lose .020" of the margin of safety using the Boss piston. It seems like everyone with any information is giving the green light on the Cobra jet exhaust cams though. I don't remember the part number, but ford also grinds a cam that's 290*/11mm lift for use with GT heads that haven't had clearance added for the rocker arm (basically a "low lift" Cobra jet exhaust cam). That might be worth while if a person was worried about durability, or didn't want to do any machine work. I doubt there would be a major drop in power vs. the actual Cobra Jet cams. [/QUOTE]
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