Need help picking a cam.
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Need help picking a cam.
I have a 350c.i.d. .060 over alum. fordged pistons,64c.c. camel back heads and standard stroke. 750 Holley carb(that I hope to jet down) Headers and a 4 speed. The motor will be at 357 c.i.d. and near 11:1cr when done. Don't have the expertise to pick a cam,but I want to learn. I'm ready,so please make suggestions. I hope I've given enough info.
Later,
Sly
Also plan on using a MSD E-curve dist.
Later,
Sly
Also plan on using a MSD E-curve dist.
Intermediate
Joined: Feb 2006
Posts: 28
Likes: 0
From: Valley Center Kansas
More info is needed! Rear differential gear ratio, expected use, intake manifold, headers. Do you want hydraulic or solid flat tappet or hydraulic or solid roller?
For a good all around sbc hydraulic flat tappet cam for a street engine you cant hardly beat a comp cams 12-209-2.
For a good all around sbc hydraulic flat tappet cam for a street engine you cant hardly beat a comp cams 12-209-2.
Last edited by Nitromad; Mar 11, 2006 at 12:39 PM.
Melting Slicks
Joined: Sep 2002
Posts: 2,783
Likes: 2
From: Engineers do it better.
Originally Posted by Solid LT1
Call 1-800-CAM-HELP and the nice guy at Comp cams will give you a good recommendation.
then call someone who knows what they are talking about and double check what their 'expert' recommended... 
Race Director
Joined: Dec 1999
Posts: 11,096
Likes: 990
From: Sierra Foothills CA
With your compression ratio & iron heads you'll need a cam w/ alot of duration to avoid detonation. Does anybody know how to reach Harold Brookshire these days? If not, you can find him on chevelles.com- he's a frequent visitor there. I can't think of his forum name there but if you can't figure it out I'll be able to recognize it & can get it to you. It probably has his first name & a reference to Ultradyne in it.
You need to have the info mentioned by Nitromad ready when you talk to him or anybody else, including trans type & torque convertor stall (if auto). Good luck.
You need to have the info mentioned by Nitromad ready when you talk to him or anybody else, including trans type & torque convertor stall (if auto). Good luck.
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
Originally Posted by Nitromad
More info is needed! Rear differential gear ratio, expected use, intake manifold, headers. Do you want hydraulic or solid flat tappet or hydraulic or solid roller?
For a good all around sbc hydraulic flat tappet cam for a street engine you cant hardly beat a comp cams 12-209-2.
For a good all around sbc hydraulic flat tappet cam for a street engine you cant hardly beat a comp cams 12-209-2.
Thanks,and please try to be patient with me...
Later,
Sly
Race Director
Joined: Dec 1999
Posts: 11,096
Likes: 990
From: Sierra Foothills CA
Originally Posted by Les
With your compression ratio & iron heads you'll need a cam w/ alot of duration to avoid detonation. Does anybody know how to reach Harold Brookshire these days? If not, you can find him on chevelles.com- he's a frequent visitor there. I can't think of his forum name there but if you can't figure it out I'll be able to recognize it & can get it to you. It probably has his first name & a reference to Ultradyne in it.
You need to have the info mentioned by Nitromad ready when you talk to him or anybody else, including trans type & torque convertor stall (if auto). Good luck.
You need to have the info mentioned by Nitromad ready when you talk to him or anybody else, including trans type & torque convertor stall (if auto). Good luck.
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Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Sealed Power/Speed-Pro P/N KC1062R cam kit includes hyd flat lifters & cam: .468"/.480" dur@0.050" 220*/231*
----FOR ....
357 c.i.d., near 11:1cr fordged pistons,64c.c. heads, standard stroke. 750 Holley carb(that I hope to jet down) Headers, 4 speed. Rear diff is 3.08,I expect to drive the hell out of it on nice days, just crusing, Edelbrock single plane intake, hydraulic lifters.
----FOR ....
357 c.i.d., near 11:1cr fordged pistons,64c.c. heads, standard stroke. 750 Holley carb(that I hope to jet down) Headers, 4 speed. Rear diff is 3.08,I expect to drive the hell out of it on nice days, just crusing, Edelbrock single plane intake, hydraulic lifters.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Why not try Soilds? More pwr for same lift result and less moving parts to break.
Hey theres are so many choises, selecting a cam can go on for ever and drive u cam buggy. 
For ur heads and c.i.'s i'm thinking 110 lobe sep angle and Comp Cams has good choises with the Extreme Energy series in both hyd and solid (i really like they're tight lash solids - quiter - though haven't been able to try one yet). That compression ratio (u really need to measure and nail this down before choosing any cam sly) can handle 280* to 285* full duration and i say CC# 12-678-4 for u. Follow mfr guidlines for c.r. applications and vlv springs.
U want enough overlap to kill detonation with pump gas yet still tame enough to run on the street. Other than that go for the cam with the most lift as there are plenty to choose from.
Good luck. cardo0
For ur heads and c.i.'s i'm thinking 110 lobe sep angle and Comp Cams has good choises with the Extreme Energy series in both hyd and solid (i really like they're tight lash solids - quiter - though haven't been able to try one yet). That compression ratio (u really need to measure and nail this down before choosing any cam sly) can handle 280* to 285* full duration and i say CC# 12-678-4 for u. Follow mfr guidlines for c.r. applications and vlv springs.
U want enough overlap to kill detonation with pump gas yet still tame enough to run on the street. Other than that go for the cam with the most lift as there are plenty to choose from. Good luck. cardo0
Last edited by cardo0; Mar 12, 2006 at 12:36 PM. Reason: more info
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
I'm making progress,I think...Heres some more #s
Cyl. Dia 4.060
Stroke 3.48
Flat top pistons
Gasket thickness.038 and I come up with 360c.i.d. and 11.2331:1 C.R.
The guy that is doing the machining for me,although very proficient at what he does,really dose'nt have much knowledge when it comes to building a perf. motor,and he admits it. He has a cam that will work in my eng,however I think the comp. is too high for it. these are the specs on the cam he has.... Sealded Power/Speet pro 2000 series.
Cam lift Int .280
Ex .295
Valve lift Int .420
Ex. .443
@.050 Dur.
Int .204
Ex .214
Personally I dont think this enough. What do you guys think?
Later,
Sly
Cyl. Dia 4.060
Stroke 3.48
Flat top pistons
Gasket thickness.038 and I come up with 360c.i.d. and 11.2331:1 C.R.
The guy that is doing the machining for me,although very proficient at what he does,really dose'nt have much knowledge when it comes to building a perf. motor,and he admits it. He has a cam that will work in my eng,however I think the comp. is too high for it. these are the specs on the cam he has.... Sealded Power/Speet pro 2000 series.
Cam lift Int .280
Ex .295
Valve lift Int .420
Ex. .443
@.050 Dur.
Int .204
Ex .214
Personally I dont think this enough. What do you guys think?
Later,
Sly
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
I think your correct.
Originally Posted by sly vette
..... .
Cam lift Int .280
Ex .295
Valve lift Int .420
Ex. .443
@.050 Dur.
Int .204
Ex .214
Personally I dont think this enough. What do you guys think?
Later,
Sly
Cam lift Int .280
Ex .295
Valve lift Int .420
Ex. .443
@.050 Dur.
Int .204
Ex .214
Personally I dont think this enough. What do you guys think?
Later,
Sly
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
So Cardo, I guess you feel that the cam mentioned by Jackson in his post above is too small also???
Thanks,
Later,
Sly
By the way,what impact would going to 1.6" rockers do to this equation???
Thanks,
Later,
Sly
By the way,what impact would going to 1.6" rockers do to this equation???
Last edited by sly vette; Mar 12, 2006 at 02:38 PM.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
U can handle a 108* lobe sep angle too.
With those "hi" 3.08 rear grs u will need to raise rpm to get rolling with nearly any cam so be ready. But once over 2,000 rpm (maybe even 2,500) you gonn'a get up and run. 
With those stock heads u could handle a 108* lobe sep angle and make a little more mid-range torque. And with that overlap burbbling at idle it will sound sweet.
Nail that c.r. and then shop (cams) until u drop.
cardo0
But once over 2,000 rpm (maybe even 2,500) you gonn'a get up and run. With those stock heads u could handle a 108* lobe sep angle and make a little more mid-range torque. And with that overlap burbbling at idle it will sound sweet.
Nail that c.r. and then shop (cams) until u drop.
cardo0
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Originally Posted by sly vette
....By the way,what impact would going to 1.6" rockers do to this equation???
Increases overlap a few degrees but adds 'bout .3" lift to vlv - a good thing. Only use on the intake side with cam >270* full duration.
Yes, long story short, use 1.6 on intk and 1.5 on exh. cardo0
Le Mans Master
Joined: Oct 2001
Posts: 6,798
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From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
You really need deeper gears; 3.50 to 3.70 range. If you can afford it... go to a roller cam. It's expensive but I think it's worth it, probably 700 to 800 dollars, not counting labor. A cam with at least 480 lift and 220 on duration. Well, that's my 2 cents worth. Larry
Last edited by lebvette; Mar 12, 2006 at 03:05 PM.
Thread Starter
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
What I really don't understand is,stock,this motor would put out approx.8.2:1 C.R. and now with the cylinders @ 4.060 and no other significant mods. that would impact the C.R. I'm way up to 11.2:1C.R. Am I missing something here???
Later,
Sly
Later,
Sly
Le Mans Master
Joined: Oct 2001
Posts: 6,798
Likes: 25
From: Pine Bluff Arkansas
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-‘19-'20-'21
Originally Posted by sly vette
What I really don't understand is,stock,this motor would put out approx.8.2:1 C.R. and now with the cylinders @ 4.060 and no other significant mods. that would impact the C.R. I'm way up to 11.2:1C.R. Am I missing something here???
Later,
Sly
Later,
Sly