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  #1  
Old 12-24-2008, 01:20 PM
antique69lemans antique69lemans is offline
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Default Hyd roller street manners

Brand: Crane Cams
Product Line: Crane PowerMax Retrofit Camshafts
Part Type: Camshafts
Part Number: CRN-289611
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,000-5,500
Intake Duration at 050 inch Lift: 214
Exhaust Duration at 050 inch Lift: 222
Duration at 050 inch Lift: 214 int./222 exh.
Advertised Intake Duration: 276
Advertised Exhaust Duration: 284
Advertised Duration: 276 int./284 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.509 in.
Valve Lift with Factory Rocker Arm Ratio: 0.488 int./0.509 exh. lift
Lobe Separation (degrees): 112



I am in the middle of a mild 455 build and wondering if I should change my cam choice. My intentions originally were to run a 068 with 1.65 rockers.I am not too happy about the "possibilty" of losing a motor build over a cam failure, so I feel the additional expense may be worth the peace of mind.The combo is 455 w/ 6x heads and rare manifolds. Approx 9.5 compression.The car is a 69 lemans with 2004r and 355 gear.The cam specs above are the mildest crane listing.How does it compare with the 068 ? and can I keep the 1.65 rockers? I already bought them.

  #2  
Old 12-24-2008, 01:32 PM
tom s tom s is offline
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JMO,VERY small cam for a 455.Tom

  #3  
Old 12-24-2008, 01:37 PM
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David Jones David Jones is offline
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I run a custom Comp hyd roller in my 400.
It's a 220/224 at .050 with .513 in / .528 ex lift using 1.50 rockers.
I run #48 heads and with the TRW pistons I run and have approx 9.5-1 comp.
In the 400 my cam has a very slight lope, just enough to say it's not stock. I have run an 068 cam, a Crane H272-2 hyd cam (216/228 with less than .500 lift in/ex) and this hyd roller. Hands down the hyd roller is stronger (seat of the pants only), especially in the low and mid range. If I were you I'd spec out something a little more than what you're considering. Maybe more in the 225/232 range. It would still be very mild and completely streetable. It would act more like the 068 does in a 400.

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1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core.
  #4  
Old 12-24-2008, 02:13 PM
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71firebird400 71firebird400 is offline
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I run a hydraulic roller in a 461, the XR288HR. With 236/240 at .050" it's a little lumpy- but definitely streetable.

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Old 12-24-2008, 02:51 PM
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chuckies76ta chuckies76ta is offline
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Quote:
Originally Posted by tom s View Post
JMO,VERY small cam for a 455.Tom
I agree..

Charles

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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 9.95@134 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
  #6  
Old 12-24-2008, 02:52 PM
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chuckies76ta chuckies76ta is offline
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Quote:
Originally Posted by 71firebird400 View Post
I run a hydraulic roller in a 461, the XR288HR. With 236/240 at .050" it's a little lumpy- but definitely streetable.
Also agree with this one.. Go with 1.5 R/R and sell the 1.65's

Charles

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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 9.95@134 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
  #7  
Old 12-24-2008, 03:29 PM
Steve C. Steve C. is offline
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"Go with 1.5 R/R and sell the 1.65's"

Why ? This presuming the valve lift with the 1.65 rockers will work with his intended installed height and valve springs. And with a small cam being considered its not like there will be a LOT of additional stress on the valvetrain.

Info on the subject by Jim Hand:

http://www.pontiacstreetperformance....ockerArms.html

  #8  
Old 12-25-2008, 12:09 AM
antique69lemans antique69lemans is offline
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Quote:
Originally Posted by tom s View Post
JMO,VERY small cam for a 455.Tom
Yes I agree, maybe. I know it isn't apples to oranges,but hear me out. I have a hyd roller in my truck motor.It is is a very strong combo but there is definately a trade off in driveability.The truck is 4200 # with a ford 460.It has a nice idle when warm and really cleans uo by 1000 rpm and smooths out.It isn't impressive untill 2600 rpm and then comes on like a 2 stroke.Very explosive power,but requires you to drive it hard for fun.The motor is more agressive than the 455 build.It has ported heads,larger valves,10.5 compression.I am running a high rise dual plane intake.While the combo makes awesome power,it is on the edge as far as driveability is concerned for me.The logic is based on Hand's wagon 455 combo running stronger with the 068 and 1.65, than it did with a 041 cam. So here are the specs on my ford cam, I am using this as my yardstick for comparison.

Part Number: CRN-359341
Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 2,000-5,500
Intake Duration at 050 inch Lift: 216
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 216 int./224 exh.
Advertised Intake Duration: 278
Advertised Exhaust Duration: 286
Advertised Duration: 278 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.556 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.580 in.
Valve Lift with Factory Rocker Arm Ratio: 0.556 int./0.580 exh. lift
Lobe Separation (degrees): 112

  #9  
Old 12-25-2008, 01:44 PM
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chuckies76ta chuckies76ta is offline
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Quote:
Originally Posted by Steve C. View Post
"Go with 1.5 R/R and sell the 1.65's"

Why ? This presuming the valve lift with the 1.65 rockers will work with his intended installed height and valve springs. And with a small cam being considered its not like there will be a LOT of additional stress on the valvetrain.
1.5's with the XR288HR cam is what I was referring too.. Definitely 1.65's with the small cam..

Merry Xmas
Charles

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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 9.95@134 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
  #10  
Old 12-26-2008, 12:56 AM
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lust4speed lust4speed is offline
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I'm running that Crane cam in my cruiser with 1.65 rockers, and it is a small cam even in the 400. Sound is closer to the 067 cam than the 068 (although the Crane runs stronger than the 068). I've got the XR288HR in my 4-speed, and I wouldn't want that large of cam in the cruiser with the A/C. So this should set the limits of your search somewhere in between these two.

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