97 460 info
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Fleet Mechanic
Joined: Feb 2002
Posts: 1,483
Likes: 273
From: Tulare U.S.A.
97 460 info
Does any one have any expearence on porting 97 heads?
Also is the cam shaft stright up on this year?
And last has any one in stalled roller rockers on a EFI engine or more directly what will fit under the stock valve covers?
Thanks Leadmic
Also is the cam shaft stright up on this year?
And last has any one in stalled roller rockers on a EFI engine or more directly what will fit under the stock valve covers?
Thanks Leadmic
New User
Joined: Apr 2002
Posts: 12
Likes: 0
From: 08836 usa
97 460 info
You say the cam on an efi 460 goes "straight up" as would a 1968-71 cam would. WHAT IS the spec(lift/dur/050/overlap...)on the efi 460 cam. I'd like comparative specs to the 68-87(?)base cam. I have yet to see any appreciable torque out of my 91 460 motor. I still wonder what the compression ratio is but figure it to be 8.5 or so from measuring and cc'ing a similar engine's head at 97cc and miking the piston recess and dish,adding .042" for the gasket. E7/E8TE heads- with 1.98 int/1.66exh.. compared to 2.08 int 68-87 heads. I am ready to blame the cam for watery torque curves. I have a 260/270deg-.487"lift stick(cheap one from PAW) ready to go in that showed outrageous torque, set straight up on an early 460 I had with approx 10.8c.r.. I long ago got past the question of fuel mix, as I scanned the mix up and down during a long pull, finding optimum in that parameter. I did this both with my speed-density and now with my MAF conversion. As I said before I am dealing with multiple ailments at once here. BT
New User
Joined: Apr 2002
Posts: 12
Likes: 0
From: 08836 usa
97 460 info
So I guess it is a "straight-up 68-up style cam. All the more reason to go to the PAW base grind. I cannot seem to get even the torque of a mid-70's smog motor and with a tad more compression yet (8.5 as opposed to 8.0)..
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Postmaster
Joined: Aug 2001
Posts: 2,882
Likes: 0
From: Nevada
97 460 info
I don't have it handy, but Tom Monroe's book 'How to Rebuild Your 351M, 400, 429 and 460' lists cam specs for the 429/460, including smog engines.
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New User
Joined: Apr 2002
Posts: 12
Likes: 0
From: 08836 usa
97 460 info
I have tried cams in my 4wd van with both the 460 and the 429, of :stock 68-up, M6250-A460, PAW's 260/270(liked it best 1500-4800), the 270/280 PAW, a crane HIT-292(never saw power due to mismatched lower range intake/carb((1850-list Holley)--I used the 292Crane to bleed off some of the 11.8:1 compression for pump gas-some help-power like the 270/280 grind. As I see it, most of us wish for more TORQUE in our 460's. Sometimes I do not mind treating the motor like a 289 and buzzing it. That is why God invented 429's with short stroke rev-ability. I could never tell the difference of outright HP-high end power, from a 460 over a 429. 460 has a slight edge at low revs and 429 better upstairs---my observations from my work done. I would really like to know the tricks to wake up LOW rpms in this motor. That is why our 13000 lb ambulance I drive walks away from my 6500 lb truck with the 460--torque in the realistic rpm range over a wide enough span... any hope out there naturally adpirated???