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Old 05-12-2009, 12:02 PM
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Need to find the right cam

hello everyone, i got the s10 running yesterday, not so good, converter wouldnt stall and the tech at summit say my cam is to big. i agree the cam is to big but i need a suggestion on what size i should go with. i have in mind
Crane hyd. high energy cam cca-cl12-246-3 which has 232-236 dur. and 490-490lift
crane solid high energy cam cca-cl12-67-4 which has 230-236 dur. and a488-501lift
The first cam i currently running is a summit 262-264dur 533-555lift, and it sound awsome, but i aint getting no power so it needs to go. what would your guy suggestions be.

283
40 over
300hp 64cc, with 1.94 valves, ported and reworked all the way around
eagle rods
forged flat top piston with the valve reliefs
weiand medium rise intake(old school)
650 edlebrock carb
summit bracket racing balancer
double roller timing chain
Harlend Sharp roller rockers
Original crank new condition(forged)
summit msd with rev limiter
4.11 gears, posi, 7.5 rearend
350th tranny shift kit, red line clutch, the hole deal

hopefully this is all you guys need. Also what would my compression be? All recommendations are highly appreciated. Thx fellas

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Old 05-12-2009, 12:13 PM
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I think he got it right, your cam is massively too big for a 283. I`m guessing this is a street machine, honestly, I wouldn`t go over a 224 @ .050 duration cam, You have to remember, you have a small cubic inch engine, and it won`t run the same as say a 350 would. A small cam in a 350 is large in a 283.
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Old 05-12-2009, 12:16 PM
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Agreed DV that cam is a monster for a 283. Keep it around 450 inch lift and you should be a lot happier!
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Old 05-12-2009, 12:22 PM
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Quote:
Originally Posted by BIGWISEXY
hello everyone, i got the s10 running yesterday, not so good, converter wouldnt stall and the tech at summit say my cam is to big. i agree the cam is to big but i need a suggestion on what size i should go with. i have in mind
Crane hyd. high energy cam cca-cl12-246-3 which has 232-236 dur. and 490-490lift
crane solid high energy cam cca-cl12-67-4 which has 230-236 dur. and a488-501lift
The first cam i currently running is a summit 262-264dur 533-555lift, and it sound awsome, but i aint getting no power so it needs to go. what would your guy suggestions be.

283
40 over
300hp 64cc, with 1.94 valves, ported and reworked all the way around
eagle rods
forged flat top piston with the valve reliefs
weiand medium rise intake(old school)
650 edlebrock carb
summit bracket racing balancer
double roller timing chain
Harlend Sharp roller rockers
Original crank new condition(forged)
summit msd with rev limiter
4.11 gears, posi, 7.5 rearend
350th tranny shift kit, red line clutch, the hole deal

hopefully this is all you guys need. Also what would my compression be? All recommendations are highly appreciated. Thx fellas
Sometimes smaller is better. The current cam seems like way over kill but yeah don't we all love that sound? What is the stall rating on your converter?
Your comp ratio calculations need to include various input values such as the deck height with relation to piston, head gasket thickness, chamber cc's, bore/stroke, piston type and some cam specs etc. There are a few web sites that allow you to enter this info and it will calculate the theoretical CR. Don't mean to get scientific on you but there are many factors involved.
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Old 05-12-2009, 01:39 PM
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You need to take full advantage of what that engine does best- REV!!!

Cam and gear it to make peak power at at least 7000 RPM (your current cam might be a tad too big) and have fun. The hurdle as I see it is not enough flow at the lift your current cam has, so drop some lift if you keep those heads. A more-streetable cam might be in the vicinity of 244* @ 0.050" and 0.500" lift.

A close-ratio 4-speed w/4.56-5.13's would be about right, depending on rear tire diameter. If you gotta run an AT, stall about 5000 RPM.

I'd go w/a solid cam, no place for a hydraulic in this engine, IMO!

If you want it to be a DD, go w/no more than 230* @ 0.050 X 0.480" lift- I think every manufacturer going has one, the differences are in the event timing and LSA.

It'll still be soft down low but will have a nice rush at about 5000 RPM or so.
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Old 05-12-2009, 08:19 PM
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when reading about the cam on summit, which part of the duration should i look at, the duration at 050 lift or should i be looking at the advertised duration,, because if i am looking for the advertised duration i cant find one with 230 to 240 dur.? Can yall give me some cam ideas, what would be the best solid lift cam to put in my 283.

401A3LUN on summit would this be a good choice.
Cam Style: Mechanical flat tappet
Basic Operating RPM Range: 2,000-6,500
Intake Duration at 050 inch Lift: 238
Exhaust Duration at 050 inch Lift: 248
Duration at 050 inch Lift: 238 int./248 exh.
Advertised Intake Duration: 272
Advertised Exhaust Duration: 282
Advertised Duration: 272 int./282 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.485 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.503 in.
Valve Lift with Factory Rocker Arm Ratio: 0.485 int./0.503 exh. lift
Lobe Separation (degrees): 112
Intake Valve Lash: 0.020 in.
Exhaust Valve Lash: 0.022 in
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Old 05-13-2009, 12:13 AM
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G'day BIGWISEXY,
Yes I agree with the others, that cam is WAY too big for a 283. I also agree with Cobalt327 a flat tappet solid lifter cam would be a good choice. GM made a couple of solid grinds including one called a "Street Mechanical" or LT1-Pink solid lifter cam. As the name suggests it was for the 350 LT1 motor. I used one of these cams in a .030' thou. over 327 back in the early 80's and it was excellent for the time in a street 65 Belair.

A buddy used the same grind of cam in a .125" over 283, in other words a 302, and that thing revved. It had mildly ported fuellie heads, 1 3/4" tubes old timey Edelbrock DP manifold with a Carter WCFB carb. That motor resided in a 57 Chevy sedan with 3000rpm stall T400 and 3.7 gears in the stock diff and it was quick for a big car back in the day. Sounded great too with a good "lopey" idle. In the 327 the lopey Idle was less noticeable, but still there, plus the "music to your ears" mechanical tappet noise.....fantastic.

The specs on that cam are as follows:- p/n#3972178. 1970-71 Street Mechanical, Lift at Valve .438" Int./.455" Ex. (0.024/0.030 tappet clearance) 280/308 duration at clearance, timing at clearance measurement 25/75 Int.,95/33 exh. 116deg. lobe centreline.

It doesn't look like a big cam but it doesn't "pull" until about 2300-2500 and has a good flat torque up to about 5500-6000 and rev's out to about 7000-7200 with good Fuellie heads. Now thats old school for ya' !.

The LT1-Pink cam is apparently still made by Crane. Here's a link for your interest. http://www.gmpartsdirect.com/perform...CATID=826.html

Look arround, ask questions go for a ride in some similar car and engine combo's......join a group or club if you need to. Above all have fun !.

Cheers..........Barry.
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Old 05-13-2009, 12:34 AM
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The solid you are looking at is good duration wise, but I would be looking for something around a 106-108 lobe separation to boost the low and mid range torque. Install whatever you use at least 4 degrees advanced to possible 6 advanced for the same reason. But, the Lunati would work if you like it.

When you look at catalog estimated rpm ranges, just remember that they are for the most common SBC, the 350, and that will move the power range up 800+ rpm or so in your case with the 283.

I wouldn't use any of the old GM grinds in anything but a restoration, there is much better in todays market.

Barry, Crane went bankrupt last month and is no longer in business - Gone!

You are never going to have much low end power without going to a near stock size cam.
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Old 05-13-2009, 12:45 AM
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Hi ericnova72,
Yes I agree that there are plenty of modern grinds that are probably much better, however I added my 2cents worth as I can speak of the experience with the cam.

Yes Crane did go bust last month but I also beleive that Crane will be re-opening in Daytona Florida ?.
Check this link to Crane Australia :http://www.cranecams.com.au/
Time will tell.

Cheers.........Barry.
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Old 05-13-2009, 06:52 PM
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ALL RIGHT FELLA S I THINK I FOUND A CAM THAT WOULD REALLY DO GOOD IN THE 283. I TALKED WITH THE TECH FROM lUNATI AND HE SAID HE WOULD RUN WITH A SOLID LIFT 233-241 DURATION WITH A 505-520LIFT POWERBAND AT 2400-6600 WITH A LOBE OF 110. WHAT DO YOU GUY THANK, WOULD THIS BE A GOOD MATCH OR SHOULD I STILL FIND SOMETHING SMALLER. REMEMBER I WILL BE WORKING WITH 4.11 GEARS AND 3200-3500 STALL IN A 3200LB s-10. LET ME KNOW. tHANKS FOR ALL THE INPUT.

i ALSO RESEARCHED TWO FROM COMP IF YALL DONT MIND CHECKIN OUT FOR ME. THEY ARE

12-676-4 230-236DUR 488-501 LIFT POWER BAND 1600-6000 LOBE 110

12-677-4 236-242 DUR 501-510 LIFT 2000 TO 6400 PB lobe 110

WHICH WOULD SOOT ME BEST

Last edited by BIGWISEXY; 05-13-2009 at 07:05 PM.
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Old 05-13-2009, 07:23 PM
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What Lunati recommended sounds real good to me.
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Old 05-13-2009, 07:46 PM
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Even better without the shouting, loose the caps.
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Old 05-13-2009, 08:30 PM
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The Lunati cam is a good compromise- you could do a whole lot worse than that cam, IMHO.
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Old 05-13-2009, 09:55 PM
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Thank for the input fellas i believe i will go with the Voodoo cam. Should i set the timeing a couple degrees back so it will be a 108 degree lobe, or play with it as i go.
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Old 05-13-2009, 10:06 PM
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Quote:
Originally Posted by BIGWISEXY
Should i set the timeing a couple degrees back
I would install it straight up.

You'll have plenty of top end- if I were gonna do anything regarding the cam timing, maybe I'd advance it a few degrees- but that would be a big maybe.
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