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Old April 1st, 2012, 04:30 PM   #1
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Street&Strip 455 Flat Tappet Hydraulic Cam

Looking to be informed in the ways of Camshaft selecton.
As of now, I have a .030 block, with resurfaced deck's, KB887 25cc dished pistions, and resurfaced GA heads; for an estamated goal of around 9:1 compression after assembly. The car has 3.73 gears, TH350 and and power brakes. I do not have a torque converter yet.

Looking for a cam which provides good torque for city driving, with plenty of throttle response in throughout the powerband. The car will see the 1/4 mile regularly.

Someone recommended the 268H Comp package

Specs:268/268 duration
218/218 duration @.050"
.456/.456 lift
110 degree LSA

I will be using adjustable rocker arm's as well. Probably the Comp Magnum's

Anyone have any experience with this cam or one similar?

Last edited by VinMichael; April 1st, 2012 at 04:35 PM. Reason: Add info
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Old April 1st, 2012, 05:23 PM   #2
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Quote:
Originally Posted by VinMichael View Post
Looking to be informed in the ways of Camshaft selecton.
As of now, I have a .030 block, with resurfaced deck's, KB887 25cc dished pistions, and resurfaced GA heads; for an estamated goal of around 9:1 compression after assembly. The car has 3.73 gears, TH350 and and power brakes. I do not have a torque converter yet.

Looking for a cam which provides good torque for city driving, with plenty of throttle response in throughout the powerband. The car will see the 1/4 mile regularly.

Someone recommended the 268H Comp package

Specs:268/268 duration
218/218 duration @.050"
.456/.456 lift
110 degree LSA

I will be using adjustable rocker arm's as well. Probably the Comp Magnum's

Anyone have any experience with this cam or one similar?
Not bad for a daily driver can but you're giving up alot on the table if it's going to see the strip regularly
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Old April 1st, 2012, 05:29 PM   #3
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just for a heads up prw sells the same roller tip rocker kit with the rocker locks instead of the nylocks which eventually get loose they cost 139 and then just buy the rest of the stuff from comp.
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Old April 1st, 2012, 05:42 PM   #4
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just for a heads up prw sells the same roller tip rocker kit with the rocker locks instead of the nylocks which eventually get loose they cost 139 and then just buy the rest of the stuff from comp.
I will check out the PRW's. And yes, I was looking over a COMP Magnum double roller timing chain the other day; very cheesy looking, not something I would want. So needlesstosay, I would not be very thrilled to install the COMP Magnum rockers on my valvetrain. Thanks for the heads up.
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Old April 1st, 2012, 06:56 PM   #5
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I run a comp cam and a double roller timing set i have had no issues yet and i beat my car like a rented mule. I just think the prw is best bang for the buck . They also have some really nice flexplates for olds i run one and its top notch stuff imo .
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Old April 1st, 2012, 07:12 PM   #6
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I run a comp cam and a double roller timing set i have had no issues yet and i beat my car like a rented mule. I just think the prw is best bang for the buck . They also have some really nice flexplates for olds i run one and its top notch stuff imo .
Good to hear your experience, no hate on COMP, it was a leftover from a friends SBC build, just remember saying, "meh" after holding the chain and gears. Just a potential COMP consumer's first impression.
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Old April 2nd, 2012, 02:50 AM   #7
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Engle 20-22 would work well.
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Old April 2nd, 2012, 03:54 AM   #8
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What ever you do ,Buy matching parts.Thats where everyone screws up.
I have a 355 olds with Edelbrock performer RPM ,intake,cam,timing chain,and Im running the comp. adjustable rocker setup.Its a mean Thumper.
Your best bet is to call cam manufacturers and ask their tech lines.I would call several cam company s .
Good luck,it will def. be fun!
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Old April 2nd, 2012, 12:42 PM   #9
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Vin, I saw your other post about your machinist...let me ask you, what is your goal for the car? You say street / strip...what sort of time would you like to achieve? Or, what new car are you looking to hang with on the street?

The engine you have built so far has some potential but the cam you mentioned would barely be suitable for a towing application if even that...I hope that wasn't your machinists recommendation. You need something like the Engle 20-22 mentioned above: .496/.512 lift, 226/230 duration @ .050".

CutlassEFI grinds cams, if you hadn't dismissed his advice in your other thread I'm sure he would've made a recommendation. He's a good guy, as are many other people on this forum. We all have different experience and goals but we do have one thing in common...we all like Oldsmobiles. Some guys build engines for restoration, and some of us like to make as much power as we can with the money we have. You could learn a few things if you stick around. Now, answer the questions I listed above and we can get you on the right track for making power with your unique BBO!

Steve
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Old April 2nd, 2012, 01:42 PM   #10
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Thank you ah64 for you input. Realistically, I would like to for be in the mid 13's at the strip and be well mannered around town and nice lopey idle (tires are BFG on 14" rim). But, I do have a set of Draglites (6x15 front and 8x15 rear) that I will use for Dragradial's. Hopefully with some tracion the car will see high 12's? Car is currently 3.73 (open) and TH350 minus the converter. Oh, and I really despise pinging and want this car to run on 91 octane on the street. (have access to higher octane at the track). For now, just want a comprimise of street and strip to meet the goals stated above. Mid 13's on street tires ( a second faster than my bother stock 01 Mustang) and fun as hell too drive in the city.
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Old April 2nd, 2012, 01:50 PM   #11
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I listened to a clip of a car with the 20-22 cam; sounded nice, better than the 268H (imo). I like the slow and lazy type of idle, if you know what I mean. The clips of the 268H was not bad either. I have dual catback's with Flowmaster's, so any cam I use is going to really be heard through my exhaust (for better or worse).
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Old April 2nd, 2012, 02:04 PM   #12
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I have a lunati bracket master 2 cam same as the eddy rpm cam. New I can sell if that works for your app. 75 bucks for the cam w/o lifters and 125 with new in box TRW lifters. Again if that works for your app I have it lying on a shelf and I was gonna use it but I'm going roller .
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Old April 2nd, 2012, 02:17 PM   #13
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I will look into the specs on that cam and what spring kit needed. Thanks and I will get back to you.
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Old April 2nd, 2012, 02:21 PM   #14
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The lunati catalog says to use springs part # 73126 or edelbrock part number 5712
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Old April 2nd, 2012, 02:53 PM   #15
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Copper, you have the 290/300 cam?

  • Advertised Duration (Int/Exh): 290/300
  • Duration @ .050 (Int/Exh): 224/234
  • Gross Valve Lift (Int/Exh): .496/.520
  • LSA/ICL: 112/108
  • Valve Lash (Int/Exh): Hyd/Hyd
  • RPM Range: 2500-5500
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Old April 2nd, 2012, 03:55 PM   #16
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that would be the one.
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Old April 2nd, 2012, 04:42 PM   #17
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That looks like a great street cam...very similar to the engle grind i mentioned...
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Old April 2nd, 2012, 05:29 PM   #18
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That BM will be noticebly lazier than the Engle you recommended.
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Old April 2nd, 2012, 06:17 PM   #19
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The comp 268 cam is to small for your application. The lunati mentioned is somewhat lazy.

I would recommend compcams 42-306-4.

Specs are: 222/226 .494 with a 110LCA

Or Lunati 31801

Specs are:228/235 .496 with a 110 LCA.

For the compcam rocker kit. I have used it before and have never had to go back and adjust the valves.

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Old April 2nd, 2012, 06:56 PM   #20
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Will be checking out those part number's. Pretty sure I would like to go with a COMP cam.

Reason being, I like how they sell complete kits
springs, retainers, locks, timing gear, lifters etc. all in one

Beats matching up parts.

I appreciate everyone's input.

Thanks joew31 for the part #'s, and sharing your experience with the COMP rockers

I also noticed the Bracket Master 2 had significantly more lift on the exhaust valve
The COMP 268H had the same numbers all around. Not sure why that is.

Last edited by VinMichael; April 2nd, 2012 at 07:00 PM.
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Old April 3rd, 2012, 04:44 AM   #21
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Will be checking out those part number's. Pretty sure I would like to go with a COMP cam.

Reason being, I like how they sell complete kits
springs, retainers, locks, timing gear, lifters etc. all in one
Comps' not the only one that does that, by any stretch. They just make you believe they are. And oyu won;t necessarily know what springs to get yet either. Olds spring heights can go from 1.700 to 1.800 on the same series of heads.

Beats matching up parts.

I appreciate everyone's input.

Thanks joew31 for the part #'s, and sharing your experience with the COMP rockers

I also noticed the Bracket Master 2 had significantly more lift on the exhaust valve
The COMP 268H had the same numbers all around. Not sure why that is.
Erson TQ40, 220/228 on a 110, .504 lift on both.

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Old April 3rd, 2012, 04:52 AM   #22
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http://www.compcams.com/Company/CC/c...csid=1170&sb=0

I ran this cam 2 years ago in the IMSM 13.50 index bracket series.
It's not bad. I had a stock 455, with ported heads and stock valves, 9.2:1

Pushed the car around between 13.1 and and 13.3 and was perfect for what needed to get done.
I never even tuned it, aside from making sure the timing curve and air/fuel were tolerable.

Could have done a lot better for all I know.

TQ 40 is good as well, but I didn't need all that lift.
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Old April 3rd, 2012, 05:00 PM   #23
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I have a Comp Extreme Energy274 in this 455, 355 gear with a M21, nice profile with this particular 455 build in my 67. However on the 64 F-85 Pro-touring build thats currently under major construction; first of all the "Bad Boy" 425 will be a 455's "WORST NIGHTMARE" That said I will have CutlassEFI work with me on a custom grind cam set up for this motor build. We have talked in the past he knows and understands Olds.
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Old April 3rd, 2012, 07:47 PM   #24
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I agree with the above that you would probably be better served by a bigger cam than 218 deg. at .050". How much bigger depends on your goals, etc. I like Comp and Cutlassefi sells Erson; they all open the valves just fine for your purposes, but getting advice carefully tailored to your usage and expectations is important. I also don't know why so many people go for expensive rockers when they are running a mild hydraulic cam that plain doesn't need them. I have successfully run stock rockers with much wilder cams than any of those in this thread. I choose the pushrod length for proper depression of the lifter plunger if the cam is hydraulic, and use adjustable pushrods for a solid cam.
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Old April 4th, 2012, 07:10 PM   #25
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Gee everyone,
Thank you for all of the detailed input
J-Chicago, I am impressed by the E/T's you achieved with the
Comp Cam, since those E/T's are what I would like to achieve also. But out of curiosity, why did you say that you did not want bigger lift for your application; such as the Erson TQ 40 cutlassefi suggested?

Rund, thank you for pointing out, with personal experience, that aftermarket rockers are not needed with these cams. Instead, you mentioned using adjustable push-rods. Seems like an opportunity to keep originality and also some $$. Like that idea very much.

But I cannot seem to find a company called Erson at SummitRacing.com.
The Specs on the TQ 40 that were mentioned seemed like a good place
to start with my build. However, the times which J-Chicago posted using a
COMP Cam is exactly what I would like to achieve.

What would the difference be if I went with a COMP as J-Chicago described, or the Erson TQ 40 that cutlessefi suggested; as in, general drivability and racing.

Last edited by VinMichael; April 5th, 2012 at 05:37 AM.
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Old April 4th, 2012, 07:10 PM
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