I'm real close to pulling the trigger and buying a Lunati/Ultradyne 272/282 solid for my 454 project and wanted some feedback from those who already have this camshaft.

How does it sound?
How much vacuum does it carry at idel?
Driving impressions?

My combo is:
65 Chevelle
454 +.030
TRW l2465 pistons
781 ovals with 2.19/1.88 valves, bowl blended and port matched
Approx. static compression ratio 9.75:1
1-3/4" long tube headers, 3" collector
Edelbrock Air-Gap RPM manifold
850 DP Holley (maybe smaller in future, already have a used 850 free)
GM HEI upgraded with Performance Distributors components
350 Turbo with approx. 2800 stall
3.55:1 gear
Power brakes

My goal is to have a fairly well mannered street car (I know subjective term) that will dip into the 12's at the strip. Usage with be 90% street 10% strip.

I spoke with Harold yesterday and he recommended either the 272/282 or the 276/284, but I'm thinking I may stay on the smaller side because of the power brakes.

Also could someone post the opening and closing events for the 272/282 from their cam card so I can see what my DCR will be?

Thanks

Jeff

I have that cam installed in my 427 project. He recommended it to me also. Sadly the motor is not running yet, but i can get the cam timing events for you when i go home tonight. It sounds like you might be good with either of those cams. Specs on what i'm building are

.060 over 427
UD 272/282F12 solid cam (he can grind it on the 110 or 112 LSA)
Performer RPM intake
215 heads, 2.19/1.88 valves, unshrouded, basic port cleanup
10:1 compression speed pro forged pistons (i forgot the part number)
th350 with 2800 stall converter
3.55 gears and posi
3310 Holley 750 vac sec

I didn't want to go to big to make this a mostly street motor, and not have to spin it to high. Your motor is a bit bigger though, so it might be able to swallow the greater size without worrying about it.

Daniel

TTT


Jeff

Jeff I do not have the cam you are talking about (but wish I did graemlins/sad.gif ).

How ever if this is any help your combination is almost the same as mine. The only difference is the heads which mine will be the same as your this year(going with bigger valves and a little port work :D ). Rear end gears are bigger than mine,I only have 3:31. I run a 28" tall tire.

Anyhow the cam I have right now is CC XE268H. With this I ran a 12 this year with full exhaust and street tires. Put about 6-7000 miles on the car this summer with no problems graemlins/thumbsup.gif .

Hope this helps. BTW I am looking at one of the cams you are looking at so I will be interested in some of the answers you get.

Yeah, that's the right one. The 276/284 should make measureably more power, but you'll need that one done on a 112 lsa. 110 will be too choppy for you. Also, IMHO, that 276 cam on a 110 would likely prefer more converter.

If all goes well I'll be able to tell you how one sounds by the weekend!!! :D

My 272/272 F12 sounds about like the stock L78/LS-6 cam. Slightly lumpy at 800 rpm idle.

i have that cam in my 408 and I really like it. It just keeps climbing and climbing. Sounds great at idle too! I think you'll like it. graemlins/hurray.gif

Big James, could you look at your cam card and tell me what the intake valve closing point is and how much advance is ground into it.

Also did you get your cam from Lunati?

Thanks

Jeff

Originally posted by Jeff65SS:
Big James, could you look at your cam card and tell me what the intake valve closing point is and how much advance is ground into it.

Also did you get your cam from Lunati?

Thanks

Jeff Yep, it's from Lunati.

On the cam card the intake closes at 47deg ABDC.

The thing is the published lobe center from thier website is 106 deg but my cam card shows 108deg @4deg. advanced. because of the detonation problems I've been having I will be installing mine straight up instead of advancing it though.

Please forgive me for butting in here James. I'm guessing Jeff is wanting an intake closing point for DCR calcs. The 47 deg on the cam card (same as mine) is at .050 lift. At .020 lift, which is what DCR calcs should be based on for this cam per Harold, I measured an intake closing on mine of 65.25 deg ABDC. That's the lift the 272 duration was measured at, which closely approximates the "real" duration after lash is taken up. 47 deg at .050 lift is the same lift that the 238 deg duration is measured at. The 65.25 was with my cam in at 107 deg CL (advanced 5 deg).

Originally posted by von:
Please forgive me for butting in here James. I'm guessing Jeff is wanting an intake closing point for DCR calcs. The 47 deg on the cam card (same as mine) is at .050 lift. At .020 lift, which is what DCR calcs should be based on for this cam per Harold, I measured an intake closing on mine of 65.25 deg ABDC. That's the lift the 272 duration was measured at, which closely approximates the "real" duration after lash is taken up. 47 deg at .050 lift is the same lift that the 238 deg duration is measured at. The 65.25 was with my cam in at 107 deg CL (advanced 5 deg). No problem Von! I didn"t get the question!

The 112 version of that cam gives the same Intake closing ( within' a few degrees like 66.5 or so) of the 276 at 110 lsa. The 276 is a bit lumpy though, more "L88" -like in a small 439ci, in +6 and lashed tight that is. If I was a stickler on really running a 'stock' 435HP 427, I'd be using that 272 cam.

James, I don't know what the recommended lash settings are on your cam, but don't be afraid to schooch it down 2-4 thou tighter. You'll get a bit more bleed-off, and easier on the parts to break-in, then you can open it up later and see how it likes it. My only problem with the loose .026 lash was the noise ( prefer it to sound like a nice, new tight, well oiled, screw machine at a distance), and more importantly, you'd alsways fry the tires when banging 2nd. And I mean annihilate up to the 7K chip in a flash! Too much torque!

Good Luck Sir! And Merry Christmas to you!

And to you Jeff, good luck with it!

Thanks guys, exactly what I was looking for.

Have a great Christmas everyone!

Jeff

Hey Von,

I've been considering the 272/272 F12 solid for my Impala SS.

Is your 272/272 F12 installed in a 396? Exhaust? Trans? Rear? How do you like the cam?

Thanks,

Dan

ss3964spd, I have a .040 over 396 with 10.0-1 CR, large oval port heads with big valves and bowl porting, L78 intake and carb, headers, 3.73 posi and M20 4 sp. The cam sounds and behaves like the stock L78 cam I had at idle but has more low end power. Plenty of vacuum for the pwr brakes. I haven't had it over 3000 rpm yet since I removed the inner springs for break in and put a 3000 chip in the MSD. The car is put up for the winter now so it'll be spring before I can put the inner springs back in and really open it up.

Thanks for the feed back Von.

My 396 is .060 over with the '702' heads, small valves but have had the bowls and short sides cleaned up. Other than the above, and it's current cam, it basically stock with the CI intake and a QJ. The static comp ratio probably comes in somewhere between 9.0 and 9.5. CI exhaust manifolds into stock 2.5 head pipes then into an X, Magnaflow mufflers and 2.25 tails. M20 and a 3.31 rear.

I forget the details of the existing Hyd cam but current cranking pressures are in the range of 150. Runs fine but just seems lazy.

The radiator sprung a leak so while it's out and the water pump is off (being replaced with a SW Stage 1 unit) if I want to replace the cam now's the time.

Does the 272/272 require double springs? I believe my 702's are fitted with Comp 911 springs.

Digging up an old topic, but I would like to see more feedback.

I can offer you some feedback since its been two years since I put this combo together.
272/282... great street camshaft! I love the lope and the exhaust note it has. Makes excellent power, check my sig below for mph! Doesn't carry alot of vacuum at idel, 7-8" @ 800-850 rpm making power brakes marginal. I switched to manual discs this winter. Cranking compression was about 175 psi making it very pump gas friendly.
I'm currently building a 498 and plan on using the same top end and 272/282 camshaft that was on the 454 short block. Should be an interesting comparison.

402A7LUN - Per UDHarold, it has made 605 bhp with a 454 in a members Chevelle, Chris_69_SS, and has been published here on the board.
Advertised Duration IN/EX: 288/296
Duration @.050 IN/EX: 255/263
Gross Valve Lift IN/EX: .612"/.630"
Lobe Sep Angle / Intake Ctr Line: 110/104
Valve Lash IN/EX: .024"/.026"
RPM Range: 3000-7000

Here is the link to the cam card:
http://www.holley.com/data/Products/Technical/402A7LUN.pdf

I will be using this same cam in my 496 build. Hope this helps.