Roller Cam Spec Recommendations

Hey Guys,

Looking for a recommendation on roller cam specs.

The engine is a 470 stroker with girdled bottom end, TriShield sourced Diamond pistons, ported TA Stage 1 SE heads, 1.6 roller rockers, SP1 intake, Pro Systems 950 Holley.

It’s going into a ’72 Riv, so heavy at 4,200 lb curb weight. It will start with the factory 9 3/8 3.42 posi with rebuilt TH400 and a Jim Weise built switch pitch converter. The goal (in a few years after I save a bit of $) is likely a 4l80e and a 4.11 Ford 9”, so please keep that in mind.

The car will be mostly street driven, but will definitely see the strip. Looking to get the most power in a usable range for launching a heavy car, but still have enough vacuum for brakes.

I grabbed the specs from two cams I know of that have had well documented testing done. Rob Chilenski’s build from https://www.powernationtv.com/episode/EP2016-17/big-bad-buick and Larry’s build http://www.v8buick.com/index.php?th...larrys-motor-complete-and-dyno-tested.252641/ on this forum.

Type Intake Lift Duration Exhaust Lift Duration Separation
Rob Roller .600 250 .600 262 113
Larry Roller .550 231 .572 238 112

I don’t know if Rob’s cam makes enough vacuum for brakes and I’m pretty sure Larry’s does (I’m also pretty sure Larry will chime in!).

Anyway, with that as a starting point any and all thoughts and suggestions welcome.

Thanks

 

I would suggest to talk to JimW about your final specs.
Here are mine
lift .608, .618
duration 234,247 113 lobe center My combo has SE stage2 heads entry porting
Brakes seem fine, 3500# car tri shield 9.5 convertor
My dyno #'s are just under Larry's almost start to red line
Going in a Riv might need something different

 

with the part, grind, and serial number comp should be able to exactly remake said cam

 

Thanks Doug and Larry.

Larry, looks like I grabbed the wrong set of specs from your motor thread, thanks for the card info.

 

Rob's is a solid roller. That being said, at 30 deg overlap, I doubt it is brake friendly.

Go with the smallest listed above

 

I have Tri-shield Performance MPG cam, @0.050 218/223, lift .547/.556, LSA 116.8. I'm pretty sure I installed it at the recommended 112º intake centerline.

Took this video two days ago. 800rpm idle, a smidge over 16inHg vacuum at 4,500ft elevation (barometer reading 85.9kpa). Torque for days and I typically run it up to 6,000-6,200rpm when going all out.

https://www.facebook.com/video.php?v=10217648479297440

 

Hey All,

Thanks for all the input! As the old saying goes, imitation is the greatest form of flattery. I have an inquiry into Comp Cams to acquire a duplicate of Larry's cam.

Thanks again,

Ken