Harold, if you don't have time to respond, I'll understand. You get swamped with cam recs all the time I'm sure. :(

I want to purchase a mild Lunati hydraulic roller cam for my Street duty 461 BB that will be installed in a 3700 lb. Chevelle. What would be your recommendation for the following combo:

461 cu. in.
GM 063 closed ovals/small valves (pocket cleanup)
10.1 CR
Edelbrock RPM Intake
Stock 750 Qjet carb
Balanced assembly
small tube headers
TH400 Automatic
3.30 rear gears
Drum brakes/No AC
RPM range - Max. 5500-5600

I want a smooth, reliable, well-behaved street engine but still have enough "uumph" to run at least low 13's at the strip once in a while. tongue.gif

I appreciate your time. Charles

Charles,

When I made up the mini-catalog with some of my cams in it, I failed to list any BBC hydraulic rollers, although I certainly offer some.
I have a 276/284HR12 with 212/220 at .050, .558/.558 valve lift, and 112 LSA. It has a very good idle, and has been sold as a Stage I 5.0L Ford cam for over 12 years. It is extremely streetable, and should go 4 or 5 years or more on one set of valve springs.
You didn't mention your converter, but anywhere from a stock converter to about 2500 SS will work just fine.

UDHarold

Thanks, Harold. The short duration for that cam won't pose a problem with the 10.1 CR will it?

Thanks again, Charles

Depending on where the ICL is ground it could be marginal. You're definitely on the edge, and with your closed chamber heads, heavy car, moderate gearing, you probably should step up one cam size to a 280. You will still have tons of torque off the line, so it would be safer.

TJC,
You can put the ICL any where you want. What you can't change is the LSA which was stated by Harold as 112. ;)
The normal ICL placement for this cam would be 106 to 108 ABDC which should work just fine.

1967ChevelleSS396,

I also have a 284/284HR12, 218/218 at .050, .558/.558 valve lift, and 112 LSA.
It is the one most popular HR I have ever made for the 5.0L Ford, and my son has one in a 350 TPI engine in a 1988 Trans-Am. The only mod is that, after about a year, he added a custom-made chip. the cam has been in his car for over 2 years.
The 210/218 is about as mild as I make. On any cam, from any cam company, the wider the LSA, the milder a cam will act---Better idle and vacuum, smoother transition from idle into power, wider torque curve. The narrower the LSA, the rougher the idle, less vacuum, the torque curve comes in later, and rises much faster. Tight LSAs are made for high-stall converters, and make a car run fastest at the track, and are more of a handful on the street.
I also have .600" valve lift HRs, starting about 228 at .050...

UDHarold

You don't need the expense of a hydraulic roller to run low 13's with a 461 w/3.31 gears! There are plenty of flat tappet cams that have great street manners/smooth idle that will easily achieve that ET goal and beyond..
Heck,I run high 12's with a flat tappet hydraulic (UD 280/288) and 2.73's and my car sounds stock.

Originally posted by Wolfplace:
TJC,
You can put the ICL any where you want. What you can't change is the LSA which was stated by Harold as 112. ;)
The normal ICL placement for this cam would be 106 to 108 ABDC which should work just fine. Ya I guess 'ground' was the wrong thing to say. I ran my calc's based on the 112 LSA, and both the 106 and 108 ICL. I still think it's borderline.