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Old 02-02-2004, 08:04 AM
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Cam choice - What do you think?

I have a used '76 350, stock bottom end (flattop pistons w/valve reliefs), 882 heads w/1.94/1.50 valves and gasket matched intake ports, edelbrock performer intake and 1406 (600 cfm) carb, stock HEI dist. w/MSD super HEI kit installed and 36* total advance by 3000 rpm, hedmann shorty headers and 2.25" dual exhaust. It's in an 82 S10 that weighs 3165 with driver and fuel. TH350 trans, 2200 stall, 3.50 rear gear and 28" tall tires. I have a Crower 267HDP (210/214 and .444 lift) in it now. Was wondering if I would see more hp switching to an Isky 270H (221 dur. and .465 lift single pattern)? Just the cam swap and not changing the intake, gears, stall, etc.

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Old 02-02-2004, 09:27 AM
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what kind of idle does that cam have? i am putting the same combo together but with a comp 274 and it is going in a 78 chevy pickup
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Old 02-02-2004, 09:33 AM
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78 if you have a question send him a PM. Please do not thread jack. The swap you mentioned would be a decent one, but I doubt it would warrant tearing the motor down and doing all the work involved in swapping a cam for the HP gain you'd find. Maybe your next upgrade should be a roller cam and a set of vortec heads? That would really wake your mill up.

K
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Old 02-02-2004, 10:20 AM
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Quote:
Originally posted by 78 chevy truck
what kind of idle does that cam have? i am putting the same combo together but with a comp 274 and it is going in a 78 chevy pickup
It idles at 850 rpm in park and 600 in drive with at least 16" of vacuum in gear. There is no lope - it sounds stock.

Quote:
Originally posted by killerformula
78 if you have a question send him a PM. Please do not thread jack. The swap you mentioned would be a decent one, but I doubt it would warrant tearing the motor down and doing all the work involved in swapping a cam for the HP gain you'd find. Maybe your next upgrade should be a roller cam and a set of vortec heads? That would really wake your mill up.

K
yeah, I looked pretty hard at the vortec heads before and roller cams are better than a standard hydraulic but right now money is an issue so all that is going to have to wait. Cam swap in this thing is no biggie - I've done it in an afternoon before but if the Isky isn't going to do much it still wouldn't be worth it. I think when I buy new heads I will go with AFR's over vortecs, compare the flow #'s between the 882's and the vortecs vs. some of the AFR's here-
http://www.chevyhiperformance.com/techarticles/41598/

Last edited by Rhansen; 02-02-2004 at 10:20 AM.
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Old 02-03-2004, 06:33 AM
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bump - anyone with a desktop dyno feeling bored?
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Old 02-03-2004, 07:02 AM
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First, if you are going to swap cams, with 882 heads I would recommend a dual pattern cam to help with exhaust evacuation as they have weak exhaust ports. I basically did the same swap in my old 350. I went from a 214/224 generic cam to a 222 single pattern Crane Cam and although I did not dyno either combo, the Crane felt weaker. I think I lost some bottom end torque with the Crane and the heads just were not able to flow at the top end. Lucky I blew the motor and built a 406. I agree with Killer on this. You are better to look at Vortecs or some other aftermarket performance head as the 882 are going to hold you back.
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Old 02-04-2004, 09:19 AM
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if any one has time could they run that combo with a 350 bored 60 over and decked 274 comp cam and 9.7.1 what would i be getting at the crank?
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Old 02-13-2004, 01:15 PM
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Re: Cam choice - What do you think?

Quote:
Originally posted by Rhansen
I have a used '76 350, stock bottom end (flattop pistons w/valve reliefs), 882 heads w/1.94/1.50 valves and gasket matched intake ports, edelbrock performer intake and 1406 (600 cfm) carb, stock HEI dist. w/MSD super HEI kit installed and 36* total advance by 3000 rpm, hedmann shorty headers and 2.25" dual exhaust. It's in an 82 S10 that weighs 3165 with driver and fuel. TH350 trans, 2200 stall, 3.50 rear gear and 28" tall tires. I have a Crower 267HDP (210/214 and .444 lift) in it now. Was wondering if I would see more hp switching to an Isky 270H (221 dur. and .465 lift single pattern)? Just the cam swap and not changing the intake, gears, stall, etc.
I finally ran those two cams on a D.D. 2000 - the smaller Crower cam made from 6 to 16 ft.lb. more and from 3 to 16 hp more than the Isky did (at the flywheel) from 2000 to 6000 rpm. No cam swap in the near future.
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Old 02-14-2004, 07:15 AM
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Its making about 330 horses at 5000rpm's and around 391 ft. lbs of torque at 4000 with the cam you have now. With a 270 cam it would make 359 horses at 5000 with 395 ft. lbs of torque at 4000.
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Old 02-14-2004, 09:19 AM
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Number I have say
Crower 267HDP- 327hp@5000 and 368tq@4000
Isky 270H-316hp@5000 and 362tq@4000
I didn't generate the numbers cuz I don't have a D.D. program. Maybe someone made a mistake?
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