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#1
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HO Racing Cam Specs
Just disassembled a 455 SD engine for a rebuild for a customer. It has a HO 041 HL stamped on the end of it. I assume it's a 041 Ram Air IV spec cam with more lift. Anybody have a old HO spec book that can give me the complete specs? BTW, it used a SD cam core with the small distributor gear on it. Pretty cool!
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#2
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I believe it’s specs are as in this chart, but this cam has the standard gear.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#3
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From an early L&M Super Duty Engineering booklet, it says:
"The 041 HL provides the same timing as the famous Ram Air IV cam at .040" lift and also has the closer 110 lobe centers and higher lift, .520 with 1.5 rockers. If the customer wishes to install 1.65 rockers with this cam, lift figures would increase to .572." Another source says: H-O Racing HC-03, 041HL, made by Crane, 4,500 - 6,300 RPM Only shows lift - 1.5 ratio - .500" Int/.504" Ex, 1.65 ratio - .550" Int/.554" Ex. |
#4
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I have the same camshaft from HO Racing (Camshaft Machine Company/Crane) except with the normal Pontiac distributor gear diameter. I plan on running it with 1.5 rockers and with Rhoads Hydraulic Lifters. 455 engine.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#5
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That second posted lift range makes much more sense since a Hydro Cam with those duration numbers would be right on the edge of failing lobes if it had .520" lift with only 1.5 rockers!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#6
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Quote:
While the HO / Crane may will pre-date the Comp Cams. Comp Cams XFI lobe does has 236 @ 0.050" and .518" lift with 1.5:1 Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#7
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Thanks for the responses. Can anybody confirm the 110 LSA on it. I'm not a fan of tight LSA's with exhaust manifolds. May stick another cam in it if so.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#8
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I have a new HC 63 here,041HL The single sheet of info states-intake duration-308,lift @1.50-.500- centerline-109. Exhaust duration-320,lift at @1.50-.500-centerline 118. Camshaft phasing straight up, max rpm 6500. Nothing else written.Hope this helps.
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#9
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Most of the HO cams I seen were around 112-114 LSA.
(ICL around 109/110)
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#10
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LSA with those specs would be 113.5
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#11
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Just info to others, the Intake centerline number is not the lobe separation number but if you take the intake centerline and the exhaust centerline and add them and divide by 2 you should be right on the 113.5 LSA number.
(LSA = Lobe Separation Angle) Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#12
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Yep that's why I posted that, hoping Gary would see it. As long as those specs that Bob posted are correct, and I see no reason why they wouldn't be, then 113.5 is the LSA. (109 + 118 divided by 2)
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#13
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Like the 744 in my 400 but with AC need a 1/2 way decent idle.
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#14
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Now the HC-03 specs are sorted, how about some burnout pics and vids using it for a bit of fun lol. (Great sounding cam as well !!)
Pump gas 455, 6X heads, HC-03 with 1.65 rockers and 3.73 rear gear (Doug Nash 4+1 box) from about 20 years ago !!!! 2 gear burnouts, some tyre torture on launch and it even managed to pull the fronts power shifting into 2nd gear !! Burnout vids https://youtu.be/-pAjopaC4-4 https://youtu.be/fwRXlALY188
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Working on going faster (and now staying dry at the same time !!) |
#15
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Thanks! Then it appears it's 230 I 240 E @.050, lift .500 I .540 E with 1.5 ratio rockers, LSA 113.5*, ICL 109*. If it checks out wear wise I'll probably reuse it.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#16
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Hopefully you can zoom in to read. These pictures are from the HO catalog.
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#17
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HC-03/63
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
#18
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The 041HL cam that you are asking about in the HO catalog is the HC-63. That cam is based on the cam that was never installed in the SD-455 that was rated at 310HP. Since you said that the large gear on the cam and the small distributor gear that is what you took out. Specs are as follows intake duration 308, lift @1:50 = .500, lift @ 1.65 =.550, Exhaust duration 320, Lift @ 1.50 =.504, Lift @ 1.65 =.554, and power range 3900-5500. I hope this is helpful
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#19
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Anyone know for sure what the duration @.050 numbers are? The numbers Ken Crocie posted above are 244 252. That's a lot more duration than the factory 041 cam which is 230 240 The engine didn't idle like it had the 244 252 number IMO..
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
#20
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Quote:
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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