Craig, I don't understand why a roller cam wouldn't work on the street.
Mustangs from 1988 forward have been using them, and that is a street
car.
The advantage of a roller cam is that it can ramp up fast, and don't
have the problem with this steep ramp that a flat tappet does. This
allows better breathing, without the wear, friction, and heat of a
non-roller cam.
Check with the cam people, as I have never heard of a roller cam dying a
quick death with idle speeds.
Frankly, why would it?
Larry
Craig Wright wrote:
> Hi Scott,
>
> Your plans sound good except I would worry about a roller cam on the
> street. Many knowledgeable people that I have spoken with said that they
> die quick deaths if they spend much time idling. If you are going to use
> the same profile as the original 289 hp you won't gain any HP by using
> roller lifters. You can get a lot of HP out of a solid flat tappet cam
> and still keep it streetable with a long life. I suggest you do some
> homework before committing to a roller and make sure that it is what you
> want. I've got a 289 with flat tappet cam, '69 Ford Windsor heads, and
> it cranks out 425 hp at 7500 rpm [although it is a little high strung
> for the street ;) ]
>
> Craig Wright
>
>
> Scott Hutchinson wrote:
>
>
>>Right now the 260 is sitting on the floor of my garage, the result of a
>>bad throwout bearing. It is amazing that such a tiny little part can be
>>the cause of so much work. Any way while the motor is out I am going to
>>try some minor work to the motor to improve performance, but more
>>importantly to increase durability and efficiency.
>>
>>The plans are thus.
>>
>>1. Screw in rocker studs.
>>2. New valve seats for unleaded gas.
>>3. Bronze valve guides.
>>4. Roller rockers. (Probably CompCams Magnums, maybe promagnums but
>>most people have said this would be over kill.
>>5. Custom Ground roller camshaft that is basically a reproduction of
>>the 289 hp cam. It will have the same firing order as the 260 and
>>should provide a nice hp boost without killing the low end torque.
>>CompCams will custom grind it for about $300.
>>6. Crane drop in roller lifters. (no modification to the block
>>required.)
>>7. F4B and Holley 1848.
>>8. Centerforce Clutch.
>>9. Roller Timing Chain
>>
>>I am quite happy with the performance of the car with the 260. I seems
>>to me the real limitation of the Tiger is traction. Even if you put 400
>>hp out of the tailshaft, you just can't get it to the ground without
>>doing some major mods to the bodywork. Who knows though, I've only had
>>the car for a year, so maybe in a few I'll get bored and throw a blown,
>>347 stroker in there, backed up by a Richardson 6 speed, I mean if your
>>gonna go for gears why not have a few more than four.
>>
>>I should have it all back together by the end of the month so I'll let
>>you know how it comes out.
>>
>>Scott
>
>
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