Thread: Another Cam Suggestion

Tweet

submit

Hi Guys, working on a 355 I want to build for the street to have fun but really stumped on cam technical stuff I don't understand. So I'm asking for your feedback please.

First, what I've got, 350 +0.30, 2 piece rear seal, 4-bolt, hyper dished pistons, moly rings, ARP rod and main bolts, 7 qt. oil pan, 10/10 crank, new balancer and sfi flexplate, (dished pistons so I can run 9.0:1 with a 64cc head),
air-gap intake, (Professional Products for use with or without vortec heads), 1-5/8" headers, 2-1/2" full exh w/Flowmasters, Holley 650 dbl. pump.

I need my topend, alum. heads, ('cuz I want alum. heads), Trick Flow, Edelbrock E-Tec 170, 200 or RPM, not AFR out of my price range and too overkill for what I'm using this engine for. Going in a 3500 lb. car with 3.89:1 gears, 200R4 trans with 2200 stall. Mainly street use, shows and cruising, want to do powertour next year so I want it to sound good! Have manual four wheel disc brakes, so no concern for vacuum, but do have Vintage Air.

Was looking at thumpr cams, love the sound but costing me power! U-Tube videos on them are quite convincing. Hyd or hyd. roller- much sound difference?

Sorry for the long description, just hope I didn't leave much out.

Thanks.

Hydraulic roller will have more valve noise, they can also have more aggressive profile for any given lift since they are not limited like a flat tappet is. I doubt if the engine exhaust not will change unless you really go big.

Keith

Either Trickflow or Edelbrock RPM heads would be a good choice for a street thumper. You can't go wrong with either one. I had a 355 a few years ago and I liked the CompCams Magnum 270 cam I had in it. If you have a roller block, I would recommend the roller version of the Magnum 270. Otherwise, go with the flat tappet cam. In my opinion, the cost of a retrofit hydraulic roller is not worth it. But, hey . . . it's your checkbook!

sbc use the hydraulic flat tappet cams, I use the Comp Cams 280/480 and love it. People right here on this site recommended it to me and they were right.

I have the Magnum 280 in my 383, and for me, it is just right. In a 350, it would be a little lumpier than I like personally, but that's a matter of prsonal preference. The Magnum series is often overlooked because of the popularity of the XE series, but the Magnum cams make great power and torque, and you can use them with a little more static compression than the XE cams.

Thanks for the feedback guys !

Thumpr cam is now out, Looking into the Edelbrock e-tec 200 and
XE 256H .447/.454 1,000-5,800 rpm
XE 268H .479/.480 1,800-5,800 rpm
Mag 280H .480/.480 2,000-6,000 rpm

Now I need roller rockers, should I get 1.5 or 1.6 ?

What benefits will that give me other than more lift with the 1.6?

Just a rookie learning.

Originally Posted by kool

Thanks for the feedback guys !

Thumpr cam is now out, Looking into the Edelbrock e-tec 200 and
XE 256H .447/.454 1,000-5,800 rpm
XE 268H .479/.480 1,800-5,800 rpm
Mag 280H .480/.480 2,000-6,000 rpm

Now I need roller rockers, should I get 1.5 or 1.6 ?

What benefits will that give me other than more lift with the 1.6?

Just a rookie learning.

There is no need to go with 1.6 rockers if this is a street engine. Now if you were going to be drag racing, that is a different story. You might also take a look at CompCams XE 262H. The XE 256H is a little small to really get the benefit of the Edelbrock heads you are considering. The XE 262H and 268H are popular grinds, and past comments from people using these grinds in 350's have been very positive. The 268H is a more aggressive grind but it should work fine with your 2200 stall converter. With the Magnum 280, you might want a little more stall than 2200. The 268H definitely has a nice sound that I think you would like.

Thanks Lynn!

I'm going to look into the XE 268 H (CL12-242-2).

I was reading this article that was using this cam. Anything you might want to point out for me?

REALLY appreciate this help Lynn.

http://www.compcams.com/information/...HP0401-001.asp

Tech,
I am amazed at the effort you show to people you dont even know. YOu must have spent 8 hours on these post. I am not even building a sbc and yet I copied these posts and saved them as a separate document. Whether this person uses your advice or not, I want to thank you for the excellent post.
Many thanks!

WOW again techinspector1 !

I can't say enough how much I appreciate this information you gave me and the time you've taken to put this info together for me.

You've sold me on the hyd. roller set up. With my luck I'll screw something up and wipe out a cam/lifter then start kicking myself. I don't want to pull the engine and all the crap that goes with it to re-do what I tried so hard not to screw up.

I'm going to study, make notes and search all the part numbers you gave me, (I really appreciate the links and part numbers).

Again you clarified so much for me and I can't express enough for the time you took to help a complete stranger.

I will keep this thread so I can refer to it often, and of course the other members that have also posted. I value all your opinions. You guys have seen a hell of alot more then I'll ever get to experience and thats your experience I must learn from.

Like they say- "You get what you pay for, You pay for what you get"

Sincerely thanks.

Hi Guys,

Found these two cams, I will give you the numbers. This is what is hard for me to understand, so with the info earlier in this thread of my engine, car combo,
basically-
355, hyper pistons(d-cup), 9.0:1 comp., 3500 lb. car, 3.89:1 gears, 2200 stall.
Other info in above posts, don't want to repeat too much.

These two roller hyd.cams:

#1-dur@.050 234/238 - adv. dur. 296/300 - 112 lobe sep. .539 int/.548 exh.

#2-dur@.050 226/234 - adv. dur. 258/256 - 110 lobe sep. .525 int/.532 exh.

With these specs what can I expect with these cams for a street engine, manners, sound, one hve more torque or hp than the other?

Don't even know if this is a fair question.

Thanks if anyone can help.

Cam #2 is the better choice but I would want a little more stall--at least 2400. Cam #1 is a little larger than you want with 9:1 compression. That cam would want at least 10:1 static compression to take advantage of the additional duration. In addition, you would need more stall, more in the area of 2800-3000. I think you would like the street manners better with cam #2. Cam #1 would be a better choice for a 383 or 400.

Thanks Lynn

Cam -1 was used in 383 build with a 10:1 compression (Edelbrock 2201)
Cam -2 was recommended to me by Howard Cams, gave them by combo info and is sending it out.

I just find it hard to look at these numbers and be able to read what application it would fit, you apparently had no problem.

Thanks!

It just like anything else--the more you study this stuff, the more you learn about it, and the more you can pass on to others. I suppose it has something to do with all the years I spent teaching.

Post deleted by author.