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HP 500 Cam

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#6 ·
Funny - they no longer list the one for the GenIV or V's. Hmmm. Maybe they never did, I don't know.

It used to be referred to as the '721 I believe. They had '731's and '741's as the next steps. I'm sure you heard those numbers before. :bigsmile:
 
#7 · (Edited)
Are you looking for the HP 500 Carb, EFI, or Bulldog camshaft. I have the Bulldogs and will be putting new cams in this winter. These blocks are 1998 Mk 4 Tall decks. Here are the Specs. My cams are in good shape. Looking to get rid of both cams and lifters and possibly pushrods if interested. They are Hyd. Flat Tappets.

Crane Camshaft Specification Card
Part Number: 13H000036
Grind Number: H-240/329-2-10 T1.2
Engine Ident: 1967-95 CHEVROLET V8 396 THRU 454 CU.IN.



VALVE SETTING: INTAKE .000 EXHAUST .000 ----> HOT

LIFT: INTAKE @CAM 329 @VALVE559 RATIO
EXHAUST @CAM 340 @VALVE 578 1.70
ALL LIFTS ARE BASED ON ZERO LASH AND THEORETICAL ROCKER ARM RATIOS

CAM TIMING OPENS CLOSES ADV DURATION
@ .0042 INTAKE 43.0 BTDC 77.0 ABDC 300 °
TAPPET LIFT EXHAUST 88.0 BBDC 42.0 ATDC 310 °

SPRING REQUIREMENTS
TRIPLE DUAL OUTER INNER
PART NUMBER 99893

LOADS:
CLOSED 120 LBS @ 1.875 OR 1 7/8"
OPEN 336 LBS @ 1.315
RECOMMENDED RPM
RANGE WITH MATCHING COMPONENTS
MINIMUM RPM 3500
MAXIMUM RPM 7000
VALVE FLOAT 7200

CAM TIMING OPENS CLOSES MAX LIFT DURATION
@ .050 INTAKE 15.0 BTDC 45.0 ABDC 105 °ATDC 240 °
TAPPET LIFT EXHAUST 60.0 BBDC 10.0 ATDC 115 °BTDC 250 °

REMARKS:
CAMSHAFT IS GROUND WITH .0012" LOBE TAPER.






Crane Cams continuously improves and upgrades its cam designs. In some cases this may mean that two Crane Cams with the same part number may actually be different grinds. You must check the GRIND NUMBER stamped on the front of the camshaft and check it against the Grind Number near the top of the Spec Card. For more information on the finest available camshafts, valve train components, and automotive ignition products, visit your local Crane dealer or call the Crane Cams tech line at (904) 258-6174 or FAX (904) 258-6167.
 
#11 ·
From memory, the Crane cam that you posted CFM, is for the carbed version.

It would be interesting to see what the EFI version uses.

I assume it is different?? I have been told that it is.

It is strange to me that the Bulldog would be such a radically different deal! But I knew that from when I was searching for a blue motor...
Bulldogs are a whole other animal...
Kent
 
#12 · (Edited)
cfm said:
Remember sting - Thunderman's cams are hyd flat tappet.

Speaking of which Thunderman - throw them away. I wouldn't even sell used flat tappet stuff to people I dislike.
Click to expand...

I wouldnt be selling them for someone to put in there motor. Im not that mean. :devious: ( Unless you need one CFM, I have a extra for sale, or possible trade for (2) 2" Super Sucker carb spacers ) :laugher: :laugher: I am keeping one for myself. Makes a nice little Beat'in stick when someone decides to run there mouth off at you sitting at a light. :eek: :laugher: Besides, there is No Way I am putting these cams back in these motors. They did work great for awhile, but now that we are rebuilding both motors, Cstraub will be making some nice Roller cams for me. That should really help wake up these motors :)
 
#18 · (Edited)
Bubbletop409 said:
rmbuilder When the heads are due for service on my HP500EFI, would a cam swap and ecm reprogram gain me enough to make it worthwhile. Looking at the 741, unless there is something better out there, thanks for your thoughts, Larry.
Click to expand...
Larry,
I believe it would be a worthwhile swap while you have the engine down. I would suggest the 16HR00004 cam, Grind # HR-236/359-2S-14-IG in place of the 741 as the lobes are the same but it is ground on a 114* LSA. The wider sep will provide better signal. One consideration, the 500 EFI heads are rect port iron heads and the 525 EFI are the proprietary Edelbrock/Merc aluminum pieces. While you are freshening the heads you may want to consider some bowl/throat/chamber work to pick up the flow numbers. If you modify the heads, and it's within your budget, have them flowed. Most cam companies will provide you with a custom grind based on your application for the same price as a shelf grind.
Bob
 
#19 ·
rmbuilder

Bob.

Thanks for your reply, is that cam you recommended a Crane, or from another manufacturer? Along with the head work you suggested, it is my understanding that the short side exhaust radius can also require some work, is this correct? Rough guess on the power increase I could expect?

Larry
 
#20 ·
rmbuilder

Bob

Another cam question, that cam you mentioned with the 114 LSA, would be very close to what you would end up with by running 1.75 or 1.8 ratio rocker arms on the stock HP500EFI cam, correct? By doing the math the lifts are almost identical, but I am not sure how much the duration would be affected. I also remember reading somewhere the ideal ICL is 109*, which the HP500EFI cam already has while the 741 is at 107*. Thanks again, Larry.
 
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