Time to buy a hydro roller cam. need help

So this is what I have in parts on the shelf LOL

71 block, Pistons and rods to make a 10.5 Comp. 482, TA Perf. stage 2 SE heads Ported by Tri shield. (no solid flow numbers) SPX intake.

3.50 gears and 255/50/17 rear tire (until I finish the mini tub) TKX 5 speed tranny, No block fill because ill be running the smaller radiator in a 65 skylark then the later cars can run. I have a girdle and center 3 billet mains. hydraulic brakes so vacuum will not be an issue. leaning very hard to the holly super sniper Fuel injection and distributor.

As far as hard parts, the cam and lifters are pretty much the last thing I need to purchase,

Im wanting a custom grind. My car has been apart for so long I cannot remember how much it weighs.

Larry runs a cam that seems to run pretty good. TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift.

That is the only cam I have to reference on this type of build. I am very open to how to proceed on pickling a cam. Im waiting on a reply from scotty brown on a cam grind.

 

I think you use vinegar and cloves to pickle cams ,....am I rite??,..haha,..sorry I had to do it,....good luck on your reply from Brown

 

Here is the hyd. Roller cam we've used in the last 4 street 482s we built
Plenty of vacuum and good street manner. 2 motors made 625 and 631 hp on the dyno and over 600ft-lb. With al.heads. scott brown did the grinds. Have 2 more going together now and ordered the same cams.

 

Thank you very much for those!

 

Do you have any video of the engines? particularly at idle?

 

Dennis from Alaska has some in his Electra, the Mother Ship. He posted some videos racing.Maybe he can help. Or Mark Franko in his 70 GS.

 

What idle vacuum did this make?

 

13-14inches

 

Totally streetable. Power brakes no problemo.
Nice combo man.

 

This is a dyno sheet from one of the motors

 

Those are great numbers, How much porting was done to those stage 1 heads? I have mildly ported stage 2 SE heads.

 

Pretty healthy vacuum for those duration numbers, 113 lc or not...

 

What rpm are you seeing this at Gary?

I would tend to agree with the questions here.. it's been my experience that you need to get the intake closed in the mid 40's ABDC to maintain at least 10" of vacuum at 750 rpm.

The advertised numbers and spring requirements indicate that it's got a very aggressive profile, it calls for 60 more psi open pressure than I have ever used with any roller cam. But I specifically avoid any aggressive profiles.

I worry about long term valvetrain wear when you get past 400 lbs open pressure.. and like to keep those pressures in the race engine category.

JW

 

I know Jim, the cam specs say questionable vacuum. But I physically check it on the test stand and it is what it is. According to Scott when I questioned it he says its the ramp profiles. Probably why more spring pressure is needed. I'm not concerned about the valve train being a roller cam with roller rockers. Maybe I'm wrong and someone else has a different opinion or experience but i haven't seen an issue yet.

By the way we did a dyno today on another street 482 just like the last 4 except on E85. Interesting results. Again made same 632 hp but this time more torque, 611 lb-ft with a curve looking like a table top.

 

I know, took 10 weeks to get the last 2 from Comp Components,Scott Brown.

 

The only good part about that is I'm in no hurry.

 

Yup, ramp profile.. a traditional ramp profile will have around 304-306* of advertised duration for that 242* @.050 duration spec. As opposed to the 299* that lobe has. It fools the engine into thinking the cam is smaller than it is, but there is no free lunch... the price to pay is considerably higher valvetrain forces. Should be ok, we run some crazy high pressure stuff in big race motors, but it's does add another dimension to the street motor longevity issues.

I tend to be pretty conservative when it comes to cam profiles, I prefer to find the power elsewhere. My favorite 482 10.5-1 cam right now makes 610 torque, 625 HP, and does it with only 234* of duration.. Lobe are big and round, require nothing more than the typical solid flat tappet cam valve spring pressures.. all that adds up to easy on the valve train and cam bearings.

But hey, if it's working for ya.. more power to ya..

And ya, I called TA.. no more roller cores... We will have to see if Mike can come up with another vendor to make a core for us. Right now the only option is a full custom round core..I had Crane make 3 Tomahawk cores for me years ago, but those are $1350 camshafts..

JW

 

Larry doesn't have Stage 2 heads....with Stage 2 you don't need to run as much exhaust lift.....565/.565 would probably run better

 

As always Jim, you have some great points. Picking a cam is kicking my ass.