Guest chucklaw33 Posted May 5, 2003 Share Posted May 5, 2003 i got a chevy 283 small block, bored 30 over with a 480 lift cam and fuelie 327 cast heads. I got a holly 650 carb, and a aluminum intake. What do you think the hosepower would be around. I would love to drop a 350 in my Z, but i got the 283 sittin in the garage. Is anyone running a setup with a 283, hows peformance. Quote Link to comment Share on other sites More sharing options...
Mike C Posted May 5, 2003 Share Posted May 5, 2003 Do you mean the double hump heads? A 283 with 64cc chambers and flat tops is about 8.5:1 compression. Most .480 lift cams are in the 280 degree duration range, 228-232 @ .050. The small bore means your "fuelie" heads are at most 1.94/1.50 valves but if the are 283 heads chances are 1.72/1.40 valves. Assuming you turn the motor 7000 rpm or so, hp is probably in the 300 flywheel hp range, but low speed torque will be minimal. Not a good combo IMO. I ran the Cam Dynamics 284/.480 cam in my 331 with 1.94/1.5 valves, and it never ran as good as it should have. Some of that can be attributed to the 112 deg LSA. With the 266/.440/110LSA cam in it now, seems much more powerful, albeit at a significantly lower RPM. Small displacement needs big compression and with SBC, the sub 4" bore block limits valve size and subsequently limits high speed flow. I am making some assumptions as to your motor, really need to know more about your combo. The 283 could be a reasonable Z motor with parts matching. Especially attractive with 3.90 diff and a T5 and the 7000 rpm capability. I would want 11:1 compression, maybe some Vortec 305 heads with their 58cc chambers and a Comp 270 Magnum cam. But once you start spending more $ on it, might as well have bought a bigger engine. A complete Vortec 350 can be had from a dismantler for about $800. You get FI, late model accessories, and a hydraulic roller cam. The stock Vortec will make more power than a very radical 283. I like small displacement, high RPM small blocks, just be prepared to spend big bucks in order to make any power. Quote Link to comment Share on other sites More sharing options...
72zcar Posted July 14, 2003 Share Posted July 14, 2003 Question is can I run a Magnum comp 270 cam with this motor and the stock heads? Can I install the cam without removing the motor from the car in my 72 I have a stock 92 goodwrench crate motor (maybe 20,000 miles) with the stock heads that came with it. shorty headers, street master edelbrock single plane, and 600 edelbrock. Hei, flame thrower and msd. TH-350 w/ b&m shift kit and stock converter. Quote Link to comment Share on other sites More sharing options...
72zcar Posted July 15, 2003 Share Posted July 15, 2003 sorry for stomping on your post...thought i was starting my own post Quote Link to comment Share on other sites More sharing options...
Guest trickz Posted July 15, 2003 Share Posted July 15, 2003 I run a 283 with 64 cc heads, comp 260 cam and 10/1 compression in my 914 it likes hi octain but runs on 87. its got a 9# flywheel and revs quick but its a blast. I dont know if it is as fast as my 72Z / 327, but i know it will out run my 75Z/250 GTO VR 400/350turbo ! Its a stout little monster even with all the custom steel pontoon fenders and other stuff . I think if you keep the cam profile a little lower (for more torq ) a lite flywheel and 354 rears you might be surprised ! Run what you have and enjoy it then upgrade as you go. 8) as my professor would say "you must not worry, YOU, just must DO IT!" 8) trickZ /john aint no 6 bangers here, were packin 8!!! Quote Link to comment Share on other sites More sharing options...
Guest benjlv Posted July 15, 2003 Share Posted July 15, 2003 914 eh....wanna send some pics my way? benjlv@chartermi.net my dad has a beautiful 74 2.0 with euro compression/cam....brad mayer did the motor and trans. Quote Link to comment Share on other sites More sharing options...
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