MYBAD79

I narrowed my search down to three camshafts that (I think) are a good fit for my sb.

Here's the specs:
383 stroker sb, forged pistons with 18cc dish and 64cc heads - 9.7:1CR

Here's the cams:

Comp Cams CS XR276HR-10
224/230 dur@.050" and .502/.510" lift 110LS

Comp Cams CS XR282HR-10
230/236 dur@.050" and .510/.520 lift 110 LS

Crane powermax #119831
222/230 dur@.050" and .509"/.528" lift 112LS


I am leaning towards the XR282 but I've read that 112 LS is preferred by many members - maybe the Crane cam is the better choice ?

My heads maximum lift is advertized at .575" but I'd like to stay well below that.

EDIT:
The trans is a TKO600 and the rear end ratio is 3.55

63mako

You can order the 282 with 112 LSA with a 1 day lead time. I like the specs on it the best for your engine. but you should list your trans and rear end ratios to better get a feel for what you really need.

MYBAD79

I added that info above in the first post.

LFZ

xr282 on a 112lsa.

63mako

The XR282 HR with 112 LSA is the cam! 112 LSA will give you a little smoother idle, Flatter torque curve, a wider operating range and increase your DCR a little. All good for a street ride!

LFZ

xr282 still wouldn't be that bad on 110lsa in a 383...still very streetable and smooth.

Cjunkie

for a street car id go with the crane cam......id run more compression for the others.

1979toy

My vote would be for the XR282. Your 383 will like more duration than you would expect of a 350. I do however prefer a wider lobe center if everything else is equal.

mbeeman350

If you like the the HR276 its availabel with a 112 LSA....under the marine cams, same specs just a wider LSA. I have the same set up only with a TH400 with 308 rear gear and this is what ordered.

Re the 1 day for custom grinds ...I ordered the marine cam from Summit on 12/22. I was told it would drop ship from Comp on 12/27. Called on 1/3 looking for the cam, told it shipped on 1/2!! Just got an email this weekend that is shipped Friday 1/5......from Ohio....
Mark

gkull

I used this one on my first 383 and it was nice. I used 1.65 intake rockers and 1.6 exhaust in the solid roller version of this cam. It should be about the biggest cam for a sub 10:1 C/R

Part Number: 119841 Grind Number: HR-296-2S-12 IG
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1957 1987 CHEVROLET 8 ROUGH IDLE, PERFORMANCE USAGE, GOOD MID-RANGE HP, MILD BRACKET RACING, AUTO TRANS W/3000+ CONVERTER, 3800-4600 CRUISE RPM, 10.0 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 3000-6500
Engine Size Configuration
262-400 C.I. V

Valve Setting: Intake .000 Exhaust .000 HOT

Lift: Intake @Cam 359 @Valve 539 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 372 @Valve 558
Rocker Arm Ratio 1.50

Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 37.0 BTDC 79.0 ABDC 296.0 °
Exhaust 85.0 BBDC 39.0 ATDC 304.0 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99838
Loads Closed 112 LBS @ 1.650 or 1 21/32
Open 327 LBS @ 1.120
Recommended RPM range with matching components
Minimum RPM 2800
Maximum RPM 6800
Valve Float 7200

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 10.0 BTDC 44.0 ABDC 107 234.0 °
Exhaust 58.0 BBDC 4.0 ATDC 117 242.0 °

sperkins

Comp Cams CS XR276HR-10
224/230 dur@.050" and .502/.510" lift 110LS - Too mild for a 383 for optimum performance.

Comp Cams CS XR282HR-10
230/236 dur@.050" and .510/.520 lift 110 LS - Good all around cam. This would be my choice out of these 3 for sure. Still slightly mild for a stroker though.

Crane powermax #119831 - Too low duration figures for a 383.
222/230 dur@.050" and .509"/.528" lift 112LS

I think a 110 lobe separation is the best for all around use. You'll get a much better "bump" at idle and a good torque curve as well.

Have you checked out the CS XR288HR-10:
Basic Operating RPM Range: 2,500-6,000 RPM
Duration at 050 inch Lift: 236 int./242 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.520 int./0.540 exh. lift
Lobe Separation (degrees): 110

LFZ

xr288 is a big cam..biggest i would run on the street in a HR..i have that cam on a 112lsa, and it idles nicely right at 1000rpms, cruises 2000rpms with no problems, and pulls like an animal to 5500-6000rpm max on my AFR195 headed 383....But I think MYBAD79 is going to need more compression and maybe bigger heads to see its potential.

NeverFinished

I have the Crane in my 383. It runs great and sounds good. Good vacuum, idles at 900 rpms. 700R4 trans, 9.2 compression, and 3:70 gears.

I would but the cam again.

MYBAD79

Thanks everybody, I think I decided on the 282. If they can get it on 112LS that would be preferred but it seems that 110LS is fine too....

The 288 might be a little too much with only 9.7:1 cr but I'm sure it sounds great at idle

I sure want to hear the cam at idle but I also want to be able to cruise at 2000rpm... gotta find a happy medium here, this is not going to be a race car

LFZ

this was key when i was picking out the combo for my 2nd 383..(the first 383 was not streetable to my likings...240/246 cam..yaddy yaddy yada). realize you don't have a race car, and know that choppy idles get old really fast, and no bottom end power sucks for the street. I think you made a wise choice with the 282. good luck.

63mako

Good Choice for your application! I used the XR288HR in my 383 with a 114 LSA. I am running 10.2 to 1 compression and Tripower with a 150 NOS shot. Nitrous likes a wider LSA I also have 4.11 gears and an Autogear M22 Rockcrusher. With your comp and gears a 282 on 112 LSA should be a good choice.

MYBAD79

It's ordered

I ordered it thru the engine shop that builds my short block. They're installing and degreeing it for a very small extra charge: the cam, OEM style lifters, retainers and hardware, true/double roller timing chain set, thrust plate and 2-piece cover for $540. That's not much more than the parts

LFZ

did you get it on a 110 or 112lsa?

MYBAD79

112 - they said it's going to be at the shop on Thursday

LFZ

good luck with that.