112 lobe sep.
Comp Cams bbc 'Xtreme' Step Nose Hydraulic Roller Camshafts. We also offer this cam in a retro style for use in early model blocks.
This cam is
our official Cam Choice in our Pro Street 572 engine. It is the perfect size
to offer maximum power without creating a great amount of stress on the valve
train. This profile is not only somewhat easy on the valve train, it makes a
huge amount of power on bbc street rods, considering its profile, and without
the need of going to a solid roller cam set up. It is very important that you run higher than normal spring pressure with this cam. We recommend the Comp 953-16 springs. Cams that are 600 lift or greater pose a stability issue in bbc engines that turn above 5800 rpm. The Comp 953-16 springs are exactly what you will need. See our other listings for these springs.
This cam has
a very unique profile. Our former cam choice # 1 profile was nearly identical
in lift and duration and had a 110 lobe sep, and it made approx. 35 hp less on
every combo we ran it on. Our new Comp custom grind is setup with a 112 lobe
sep, yet still makes so much more power, and with the 112 lobe sep, creates a
safer setup overall for the engine than a 110 lobe sep.
This is an
amazing cam in every respect. As you may know, there are many aspects to a camâ€™s
profile besides lift, duration and lobe sep. and Comp Cams has produced an
excellent cam that works very well in all bbc street rods. Weâ€™re going to list
below our actual dyno results on every size of bbc engine we have dynoed with
this cam. We have used it in at least 300 bbc engines, from a 454 up to our 632 in the
past couple years.
Official Dyno report on our 572 engine with this cam, AFR heads, and a single plane intake.
You will have to run a higher than normal grade lifter and slightly higher than normal spring pressure.
Regular drop in roller lifters will not work properly with this cam. They are
not able to handle this much lift and duration.
Our regular Morel Tie Bar hyd. roller lifters will not work with this cam. You must run the Comp Short Travel lifters with this cam. As you may know, the smaller cubic inch
bbc engines will require a bit more rpm to make max power, and right at 6000
rpm, the regular street tie bar lifters were allowing light valve float to
enter the picture. This is evident on the dyno, as the engine takes a sharp
nose dive right about 5900-6000 rpm. We were also able to hear the engine flutter right right at 6000 rpm. If you follow our recommendations on lifter and spring selection then you will not have a problem with valve train stability.
Valve float to a minor
degree can allow a valve to come loose from its locks. This could spell instant
doom for your engine. It would be fair to say that most dropped valves in bbc engines happen when the rpm is taken
past the valve train limits. Each time
minor valve float comes in, it is weakening, or may we say, creating excessive
wear on components that eventually lead to a dropped valve.
We have many
allies against such problems, such as the Comp Short Travel lifters, light weight PBM Competition valves, Comp Cams 953-16 springs and 308 retainers. This is what we use in our bbc heads that run this cam. We also use high quality roller rockers such as the Comp Ultra Pro Magnums.
Official Dyno Results on this engine in our 572 pump gas engine with a single plane intake, Bravo 335 rectangular port heads, 1150 Dominator carburetor, and MSD distributor.
Please read the
complete ad before purchasing this cam.