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Old 04-13-2005, 07:19 PM
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Roller cam choices. 355 SBC

Ok i built my engine up and now i think i need more cam. Im trying to avoid over camming my engine but i know the cam i have is a bit small. I had an auto when i built it and a stock converter so i went with the comp cams 268 extreme energy cam. 224 230 .477 .480 The engine specs are as follows

Chevy 1975 0010 hi nickel hi tin block 4 bolt main.030 over bored
Gm forged crank cut .010 .010
Eagle forged I beam rods
Steel four bolt main caps stock bolt location
Speed pro forged pistons 9.72:1 compression
Childs and alberts ZGS rings
comp cam as mentioned above
Matching springs
Comp cams pro magnum rocker arms 1.52:1 and comp guide plates
Hardend pushrods
Manley proflo valves 2.02 1.6
Dart pro 1 aluminum heads angle plugs
Edelbrock air gap intake
Speed Demon 650 Vs carb
melling Hv oil pump
soon to have a 7qt oil pan
rebuilt hei with perf distributors race coil currently 36 deg total timing 16-18 inital
K&N x stream lid and 3 in filter
hayes flywheel
T-10 close ratio
ford 9 with 3.70:1 rear with a auburn limited slip
295/50/15 tires
1978 camaro
engine is balanced and it is reved to 6500 or so but has potential for higher too bad its throwing around such heavy parts. No accuarate drag times as of yet, no idea what hp i have either. Next year or this summer i hope to find out.I know its fast but it may have room for improvement, any ideas what cams would work well for this engine? I am looking more twards soild rollers if that helps thanks for the help. Ps the engine is in my album but i have since added heads and a diff. intake. this car is street driven but only maybe 3000 mi a year and it sees the track as often as i can get there. I will be putting in subframe connectors and a 10 pt cage as well as new rear frame rails or maybe backhalf it to fit the tires better.If i back half it it will also get a 4 link rear suspension. The current body i have it in is twisting with the auto trans let alone the manual i have for it. (in a 79 auto car will be in a 78 manual after this winter)

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Last edited by Jared; 04-13-2005 at 08:23 PM.
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Old 04-13-2005, 07:47 PM
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Well, ya got 3.70 gears and a 4 speed. A big cam won't hurt too much, just rev it a little more when you launch.

Larry
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Old 04-13-2005, 08:35 PM
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I assume that you have the 200cc pro 1's, if that is the case, I would recommend the XR288HR (236 242 @.050 .520 .540 lift 110 lsa).

Adam
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Old 04-13-2005, 08:42 PM
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yea there the 200cc version. thanks for the advice, any other oppinions are welcome also. It sounds like the range im looking for though. Is that grind offered in roller, and if so hyd,solid etc?
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Old 04-13-2005, 08:50 PM
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Quote:
Originally Posted by Jared
yea there the 200cc version. thanks for the advice, any other oppinions are welcome also. It sounds like the range im looking for though. Is that grind offered in roller, and if so hyd,solid etc?

XR (X-treme Roller) 288 HR (Hydraulic Roller).

Lumpy beast of a cam too. It'll make you feel like a hero.

Larry
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Old 04-13-2005, 08:58 PM
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Go with at around 230o to 240o of duration at .050", and as much lift as you can get. That will keep your streetability, and make some worthwile power.

That other cam you were talking about is a waste of a rollerized cam setup. You would be dissapointed after you put it in.
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Old 04-13-2005, 09:08 PM
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It is a hyd roller.

Adam
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Old 04-13-2005, 09:11 PM
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the cam I was talking about is a flat tappet hydraulic cam that I have in it alredy. thats what i want to get away from. Thanks for the breakdown on the part # Im not too good knowledgable on cams yet, workin at it though. thanks. P.S. what can a hyd roller rev to before valve float, if it has the recomended springs. also what do you think about the new springs there marketing now? (beehive)

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Old 04-13-2005, 09:41 PM
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Vavle float will come in at around 6000 with the recommended springs. Using stiffer springs can lead to collapsed lifters. I dont know a whole lot about the beehive springs, so I cannot recommed them. I would recommend running the recommended springs, and the AFR hydra rev kit. I have heard really good things about it. Here is some info on it.

http://www.airflowresearch.com/pages/hydra_rev.htm

Adam
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Old 04-13-2005, 09:57 PM
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interesting. So now what if i ran a solid roller cam shaft? Thanks for the article. Ive never even herd of this type of system.
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Old 04-13-2005, 11:36 PM
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I meant take advantage of the roller cam. If you run one, run one with a lot more lift compared to duration. That is what roller cams help with.

Run the hydraulic roller cam. I have spun my roller 5.0 well beyond 7,000 and it wasn't floating.

You don't need to be spinning much past 6 grand anyway. Do you really need to risk a catastrophic valtrain or bottom end failure just for the 20 to 30 hp that may or may not be there above 6,000?

Solid roller cams wear valvetrain parts out quick. Most of them have too aggressive of grinds for a streetable engine.
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Old 04-14-2005, 12:01 AM
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Id run a hydraulic unless your okay with the periodic readjustments of the valve train.
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Old 04-14-2005, 06:33 AM
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I would just forget this solid roller thing. It will still be a beast to drive if you get something worth even getting a roller cam for. I agree that you should find somthing 23-240 range with as much lift as you can get. Those pro 1 heads only get better up to .600 lift, so get as close to that as you can.

Chris
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Old 07-04-2005, 03:09 AM
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let the experts handle it

go here http://www.elgincams.com/ Dema will take good care of you and get the most out of your combination.
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Old 07-04-2005, 12:09 PM
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Quote:
Originally Posted by TurboS10
I would just forget this solid roller thing. It will still be a beast to drive if you get something worth even getting a roller cam for. I agree that you should find somthing 23-240 range with as much lift as you can get. Those pro 1 heads only get better up to .600 lift, so get as close to that as you can.

Chris
Quote:
Originally Posted by firestone
I assume that you have the 200cc pro 1's, if that is the case, I would recommend the XR288HR (236 242 @.050 .520 .540 lift 110 lsa).

Adam
Edelbrock retrofit hydraulic roller camshaft #2201 (296/300 Adv. Dur.; 234/238 @ .050; .539”/.548” lift w/1.5s; 112 lsa installed @ 107 intake CL) - ($220 at Summit) ; Howard's retrofit hydraulic roller lifters #91114 - Page 23 on their catalog (About $300 when I bought them a year ago). This cam idles well and has a great powerband, especially in my 383 SBC .

Ed www.edgesz28.com
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