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Posting Guru
Joined: Feb 2002
Posts: 2,404
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From: Cleveland, WI USA
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I think I have a cam selected for my 78 F150 460 4x4. Based on several threads in this forum, it seems the Comp. Cams 268H or the Crane H-266-2 are the prefered cam for my application. I still want to talk to the companies directly and get their opinion.
Now for the questions. Do I need to do anything to the block for the new cam? Like machine the holes where the bearings are? Do I have to measure these with a mic to order the cam or do they just assume it's within factory tolerances?
Also, in selecting a cam, should I stay away from any brands?
Thanks for the help.
Kevin K.
Now for the questions. Do I need to do anything to the block for the new cam? Like machine the holes where the bearings are? Do I have to measure these with a mic to order the cam or do they just assume it's within factory tolerances?
Also, in selecting a cam, should I stay away from any brands?
Thanks for the help.
Kevin K.
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
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I installed my CompCams 268H without any work to the block. Just make sure that you use matching lifters, new valve springs, and a good timing set that doesn't have the factory 4 degree retard built in. My 268H works very well and makes big power over the stocker. Also, make sure that you break it in properly. and you will have years and years of good performance.
The 268H has a noticable lope to it, more so when it is cold. It will not effect any vacuum accessories though.
The 268H has a noticable lope to it, more so when it is cold. It will not effect any vacuum accessories though.
Postmaster
Joined: Aug 2001
Posts: 2,882
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From: Nevada
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I've never had a problem with changing cams using existing bearings. As lxman1 said, make sure your valve springs are matched to the cam and use new lifters.
If you need to change valve springs, you can do it without removing the heads by using compressed air, or as a last resort, filling each cylinder with thin rope (one at a time with air or rope) to keep the valves from dropping into the cylinder when you compress the springs and remove the keepers.
You'll like the cam change.
If you need to change valve springs, you can do it without removing the heads by using compressed air, or as a last resort, filling each cylinder with thin rope (one at a time with air or rope) to keep the valves from dropping into the cylinder when you compress the springs and remove the keepers.
You'll like the cam change.
