I'm at the point where I'm picking a cam for my wifes '70 mustang and could use some help.
Here is the pertinant info:
1970 351 4V cleveland with closed chamber heads.
Silvolite #1159 .030 over dish pistons. These are the later 351 pistons and I estimate they will give roughly 10.4 or 5 to 1 CR with our heads.
Stock intake and exhaust manifolds
650 holley. I have a vac secondary and a double pumper, I'll try both of them. I also have a 700 DP and a 750 Vac sec but I don't think those are needed.
Stock close ratio four speed with 3.25 rear end. It has a fairly large fywheel and an 11" clutch. Someday it may get a set of 3.70* gears.
This is not a daily driver, we used it for coast road cruising and mountain runs.
The stock motor specs say it makes 300 HP at 5400 rpm.
I thought that spinning it up a little higher was in order but still, the max rpms it should ever see is under 5800.
I called Crane to ask about the 278 energizer cam, #113132,(see the spec card here:
http://www.cranecams.com/index.php?show=browseParts&action=partSpec&partNumber=133132&lvl=2&prt=5) and the tech guy recommended a crane 523802 powermax instead. Here is that cam listing:
http://www.cranecams.com/index.php?show=browseParts&action=partSpec&partNumber=523802&lvl=2&prt=5
The tech said it had a 114* LSA
My concern is that it has not enough overlap and a bit too much duration and it will make a detonation machine out of that motor. The Crane tech guy said it would not be a problem.
He also said it was a grind that took better advantage of the bigger dia ford lifters, as opposed to alot of the more popular chevy grinds on a ford cam, whatever all that means
The heads and intake and exhaust are not going to get changed.
Also- are the screw in stud conversions that install without machining worth using in this application or should I go with the real ones that require some time at the machine shop. I think you use BB chevy rocker arms with either setup unless i get a set of harland sharp rockers.
Any suggestions? Criticism? Mockery?
Thanks for reading this ,
Mikey
Here is the pertinant info:
1970 351 4V cleveland with closed chamber heads.
Silvolite #1159 .030 over dish pistons. These are the later 351 pistons and I estimate they will give roughly 10.4 or 5 to 1 CR with our heads.
Stock intake and exhaust manifolds
650 holley. I have a vac secondary and a double pumper, I'll try both of them. I also have a 700 DP and a 750 Vac sec but I don't think those are needed.
Stock close ratio four speed with 3.25 rear end. It has a fairly large fywheel and an 11" clutch. Someday it may get a set of 3.70* gears.
This is not a daily driver, we used it for coast road cruising and mountain runs.
The stock motor specs say it makes 300 HP at 5400 rpm.
I thought that spinning it up a little higher was in order but still, the max rpms it should ever see is under 5800.
I called Crane to ask about the 278 energizer cam, #113132,(see the spec card here:
http://www.cranecams.com/index.php?show=browseParts&action=partSpec&partNumber=133132&lvl=2&prt=5) and the tech guy recommended a crane 523802 powermax instead. Here is that cam listing:
http://www.cranecams.com/index.php?show=browseParts&action=partSpec&partNumber=523802&lvl=2&prt=5
The tech said it had a 114* LSA
My concern is that it has not enough overlap and a bit too much duration and it will make a detonation machine out of that motor. The Crane tech guy said it would not be a problem.
He also said it was a grind that took better advantage of the bigger dia ford lifters, as opposed to alot of the more popular chevy grinds on a ford cam, whatever all that means
The heads and intake and exhaust are not going to get changed.
Also- are the screw in stud conversions that install without machining worth using in this application or should I go with the real ones that require some time at the machine shop. I think you use BB chevy rocker arms with either setup unless i get a set of harland sharp rockers.
Any suggestions? Criticism? Mockery?
Thanks for reading this ,
Mikey