Flyinace3

Help with cam recommendation
350 Goodwrench
Heads Patriot freedom 185 from Straubtech 2.02/1.60 Valves
Flow
Lift Intake Exhaust
.300 202 145
.400 235 175
.500 241 185
.600 248 190
http://www.ebay.com/itm/SBC-185cc-Pa...21260921779%26
Static compression 9.2 measured. Head 65cc, Felpro .015 gasket, Pistons .030 down, 13cc dished GM pistons
Rocker arms : Scorpion roller - either 1.5 or 1.6 need help deciding
Carb : Jegs remanufactured Qjet
Intake : Edelbrock Performer 2101
Ignition : Jegs HEI W/50000V coil
Exhaust : Hooker Sidemount headers w/ sidepipes 1 7/8" x 42 primaries. 4" collector and hooker max flow baffles
Car : 1980 Corvette
weight : 3228lbs on the title
Transmission : BW Super T-10 4 Speed. 1St 2.88, 2ND 1.91, 3RD 1.33, 4Th 1.00
Rear Ratio : 3.73
Tire : 255/45-17 Nitto NT555
6000 RPM max
Usage Weekend street car, occasional trip down the 1/4 mile.
Help and opinions on a cam for my combo. I want it to pull real hard in the midrange like 2500 and up. As it is now it wont hook up out of the hole and Due to the fact corvette rear ends are weak I do not plan to put a drag radial or to get the car to hook up.
I contacted a few cam manufactures and these are the cams they recommended for the information I posted above. Id really like to hear your comments on their recommendations and what you would recommend.
What if any would the benefit be to use 1.6 ratio rockers vs 1.5?

Howards cams 110991-08 http://www.summitracing.com/parts/hrs-110991-08
Adv dur 275 275
Dur @ .050 221 221
Lift W/1.5 .470 .470
LSA 108
ICL 104
Overlap 59
Overlap @ .050 5
RPM Range 1700-5700
DCR 7.5

Crower 00903 http://www.summitracing.com/parts/cro-00903
Adv dur 278 284
Dur @ .050 218 226
Lift W/1.5 .462 .470
LSA 112
ICL ??
Overlap 57
Overlap @ .050 -2
RPM Range 2000-5700
DCR 7.2 assuming 4 degrees advance

Lunati Voodoo 268/276 10120703 http://www.lunatipower.com/Product.aspx?id=2325
Adv dur 268 276
Dur @ .050 227 233
Lift W/1.5 .489 .504
LSA 110
ICL 106
Overlap 52
Overlap @ .050 10
RPM Range 1600-6200
DCR 7.6 Note Steve Slavik @ Lunati recommends to this cam ground on 108LSA to increase midrange punch and bring the peak RPM level down 100-200RPM's

Crane cams 282 Energizer HO6 Part number 100082 http://www.cranecams.com/product/car...detail&p=23762
Adv dur 282 282
Dur @ .050 226 226
Lift W/1.5 .470 .470
LSA 106
ICL 101
Overlap 70
Overlap @ .050 14
RPM Range 2400-6200
DCR 7.5

Comp Cam Xtreme Energy cam part # 12-242-2. http://www.compcams.com/Company/CC/c...x?csid=86&sb=0
Adv dur 268 280
Dur @ .050 224 230
Lift W/1.5 .477 .480
LSA 110
ICL 106
Overlap 54
Overlap @ .050 7
RPM Range 1600-5800
DCR 7.6

Bullet cams CHS 276/286-H10+4 http://www.bulletcams.com/Masters/ultradynemasters.html
Adv dur 276 286
Dur @ .050 221 230
Lift W/1.5 .454 .454
LSA 110
ICL 106
Overlap 61
Overlap @ .050 5.5
RPM Range ?
DCR 7.4

Kacyc3

My little bit of knowledge of cams says

Crower 00903 http://www.summitracing.com/parts/cro-00903
Adv dur 278 284
Dur @ .050 218 226
Lift W/1.5 .462 .470
LSA 112
ICL ??
Overlap 57
Overlap @ .050 -2
RPM Range 2000-5700
DCR 7.2 assuming 4 degrees advance

its a litte smaller than the one in my 406, and it has a torque curve like a table top and pulls all the way to 6k.

63mako

I like the Lunati. With the 108 LSA recommendation considering your compression, where you want your rpm and it will bump your DCR a little. I would use 1.6 on the intakes, 1.5 on the exhaust, as the heads like lift and the exhaust flows. Split duration will work better considering your I/E ratio. I still think you would be better off with a hydraulic roller for your use.

StraubTech

The I/E ratio is 76.7% at .500" lift.

63mako

I was going off this which shows 68% I/E ratio @ .500.
http://users.erols.com/srweiss/tablehdc.htm#Chevy
Also bump lift on the intake and slight duration increase W/1.6 rockers. it is an 8 degree split, less with the 1.6/1.5 rockers factored in. The difference in flow from .400 to .500 on the chart I have linked here warrants as much lift as possible. Of the choices listed this would be mine. A hydraulic roller would be a better option with the difference in duration @ .200-.300 and up and increased lift. Duration @ .050 numbers don't tell the whole story.

StraubTech

the posted numbers that the OP has listed are off my bench. I'm comfortable that they are correct.

cv67

Would think he would consult the expert rather than a forum?
Not being critical of the op at all (Im guilty of 2nd guessing Drs lol) just sayin

63mako

If the ratio is actually 76% I would lean toward a single duration with equal lobes profiles similar to the intake lobes on the lunati listed with 1.6 and all other factors the same. They will custom grind it for the OP as the 108 LSA is a custom grind anyway. I have used these on flat tappets and like them for aggressive lobes.
http://www.summitracing.com/parts/cro-66000x3-16

StraubTech

The heads with just some bowl work will go to 270 cfm at .500". This is the head that won the Car Craft Budget SBC Head shoot out in June of 2012. It's a great little perfomance head.

TedH

See signature for my cam recommendation. Comp Retro Roller.

StraubTech

For those of you that have called and discussed projects with me you know the time that is spent on the phone. I also give you an evaluation of your combination and what needs to change to achieve your goals. I also NEVER give a cam recommendation until I have "used my dart board"....industry joke. It takes about 1.5 hours to run the numbers to calculate out lobe area and events. What my customers get for their money is a cam designed for what they want to do. I see these cam descriptions that say 2500 to 6000 rpm for a SBC. 50 years ago the biggest SBC was 327 CID. 40 years ago the biggest was 400 CID, today they are 450 CID. So that same came makes the same power in a range of 283CID to 450 CID? Really.

scottyp99

I think the power range numbers are an estimate for a 350 cubic inch engine, and you are supposed to extrapolate for your own actual displacement. Kinda like intake flow numbers and bore size.

Scott

Flyinace3

I will talk with Chris on my cam selection, chris as the forum strongly agree on a hyd roller for my application . I talked with the mentioned cams tech departments to get their recommendations . and I also want the forms opinions because you guys actually have the cars and experience knowing what works and what doesn't. A few of the cam manufactures tech departments are more like sales in a best buy.....aand worse yet are the companies that don't even reply or contact a guy back. Straub tech is top class in excellent customer service

StraubTech

I bet if you call some of them back today you will get a different recommendation.

Thank you for the Kudos. Believe me I'm not picking on you I'm using your thread to educate. I have posted for years about I/E ratio and how you can use it to better understand what cam you need.

1wicked55

Lunati, comp or custom roller.

I don't know your budget but by the looks of what you already spent I think you should spring for a roller. I would also consider raising your rpm limit to 6500. This will give you a better power band range and take advantage of the heads and exhaust flow.

Flyinace3

I also asked all the named cam manufacturers that I listed to spec a hyd roller as well. 2 of them responded with very similar cams to their mech hyd cams. 1 replied with aroler cam on a 112lsa vs 108 for their hyd cam . 2 decided not to give a recommendation for a hyd roller.
As of now I am undecided about going to a hyd roller, cost , performance, reliability ect.
If I do decide to go roller it will be from chris.

Flyinace3

.
From the information I have received so far 6000rpm is pushing it for my rotating assembly. Short block is a goodwrench 350, cast pistons, crank, PM rods.
I haven't set a budget per say, more of how much can I get done before spring, suspension, engine and a lot*of little things.

63mako

I believe you will not regret using a hydraulic roller or Chris Straub to supply it. Additional $ spent now will pay dividends on reliability, power, 1/4 mile times, streetability and longevity. If you haven't received your heads yet have the springs set up for your cam. Post up cam specs when you get them.

StraubTech

Even if you don't use my stuff going hyd roller will be your best bang for the buck. It is not a question of if the flat tappet will fail but when.

1wicked55

I you would be surprised how many all cast small blocks are turning 6500 plus.
Just because it will turn 6500 does not mean you have to do it everyday. Look at all those claimer class dirt track cars. Most of them are all cast with ok heads and cam.