Harold, here's my set up
406 small block
flat top forged pistons
AFR 195 74cc heads
6" rods
10.5 compression
i want a solid roller for street use with limited drag use. lift should be in the .550 area. the duration is where i cant make up my mind. the car is a 65 chevelle with a overdrive manual trans and 3.42 gears. i can run manual disk brakes if needed. i want this to make good power to 6500 rpm. can you help.

tlowe,

I can make the following cams:

278/290 242/254 .556/.556 112 501B1LUN
285/295 249/259 .556/.556 110
290/300 254/264 .556/.556 110
295/305 259/269 .556/.556 110

276/284 243/251 .582/.582 112 501B2LUN
287/295 254/262 .582/.582 110 501B8LUN
295/303 262/270 .582/.582 110

ALL of these cams are proven street cams, with
several with over 10 years of street use per customner. The 290/300 has gone over 2000 miles in 24 hours without valve train trouble.

Valve lash on either lift family should be about .020"-.022". Any cam can be made on your desired LSA, as they are all custom-ground cams.

The 285/295R10 will have lots of power and will work the 3.42s just fine. The Lunati part number is 50199--This means 'custom ground SBC roller', and the grind number is 01-UR35-UR36-10-A01 for this cam on 110 LSA. For one on 112 LSA use 01-UR35-UR36-12-A01.

UDHarold

UDHarold,

how will the 285/295r10 behave at idle. do you think lope maddly at 750rpm or slightly lope at 800. what i'm looking for is a general idea of it's personality. will the 110 or the 112 be better for street use which is the case for this engine. thanks for your input. tom

Tom, you might be better off dropping compression just a smidge and running a slightly smaller cam. Anything with 250 duration is going to get rough. The smallest cams in the groups should turn 6500 easily ( making power I mean). The wider lsa will cut your ET, but add some low speed smoothness for normal driving.

Are you running a steep 1st-2-3rd gear?

yes, i'm running a richmond 6 speed with a 3.28 1st gear. i think i'll have alot of trouble getting traction in that gear so i may start in 2nd at times. the 1 st gear will be real good for parades though. your right i may go with a cam that is near the smallest one. i've had trouble finding srcams with lifts in the 550 range. still waiting to see if anyone has experience with cams this small in the solid rollers. tom

I run a Comp street roller (sorry Harold ;) ) that is .570 'ish lift with 1.5 rockers, 248*/254* @ 050 on a 108* LSA and it pulls to 6800 in my 383 with fastest ETs shifting about 6500.

My point is that the smallest two of Harolds recommendation would be where I'd go. With the real steep 1 st gear you have and the 6500 and below RPM goal my pick would be the same as Harolds -- the 285/295. The 278/290 would work just fine too (and without changing your compression ratio).

Your DCR with the 285* cam would be 8.0:1 and with the 278* cam would be 8.3:1. That is assuming 4* advance -- Harold will probably tell you to run the 285* cam 6* advanced which bumps your DCR to 8.2:1. But that is just a guess.

ps. Good to see you around Harold smile.gif

A question for the board. Since the AFR heads have a nice exhaust port. Do you think picking a cam with the closest to a single pattern (276/284 cam above) would make more sense. Or is this only true when you are running open headers?

Thanks, Eric......

We have no problem making a 285/290R12, which I'd put in about 106° ATDC. It would be 249/254 at .050, .556/.556 gross valve lift, about .535/.535 net lift. You could d\rive it every day for 5 or more years, and depending upon the dyno, have anything from 510 BHP at 6200 to almost 600 BHP at Westech's dyno......
Quite often when I am reducing exhaust cam size for various reasons, I spread the LSA about 2°. It helps make the exhaust cam loook a little bigger at high-rpm, gives better vacuum, and a wider and smoother power band.

UDHarold

BTW, don't forget, 383/406 means SMALL-BASE-CIRCLE CAM. Don't forget to ask for it!

Originally posted by UDHarold:
depending upon the dyno, have anything from 510 BHP at 6200 to almost 600 BHP at Westech's dynoAlmost fell off my chair laughing! Good one, Harold. I've been pissed off at the fake magazine numbers for years.

/Markus

i agree on the car mag dyno numbers, but they do give us an idea of what works without having to spend our hard earned money. i wish they would use other brands than their main stay of edel, comp and such.
i am probably going to go with the 285/290r12 on UDharolds rec. after this motor is done i will post the dyno numbers from my small town shop's dyno.
eric68,
how does your cam behave in your 383 at idle and low rpm cruises? tom

Tlowe
My 406 sbc now runs the 285/295 249/259 .556/.556 110 cam set at 6 degrees advanced in a 10.25:1 dart ie 200cc head combo. The car is 3600 lb, running a 700-R4 trans with 3000 stall and 3.73 out back. I am still getting it dialed in, but it is streetable with limited vacuum.
Runs at 8" in gear @ 1000 rpm & 15" at 2000 Rpm in overdrive, runs like a snorting bull with a little Tabasco sauce on his privates between idle and 1800 rpm then exhaust sounds very even and loud( full 2.5" dual dynomax super turbos w/H pipe ). I was nevouse that the low end tourque would be down as I thought it was overcammed, but this was not the case. I find I dont have to rev to the ceiling and pulls clean at any rpm.
Do not have any track time yet but its a lot of fun to drive. Listen to UDHarold he has more feedback about how his cams work than most of us. Dont try to 2nd guess the MasterCamMan.
Good luck with your project.