A little help with a little 283
12-12-2014, 09:58 PM
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A little help with a little 283 I have an old sj 283 that's been bored .125 over and the stock forged crank. Engine came out "as a running engine" of an old dirt track car years ago so I should not have and cylinder wall thickness problems. For heads I was just planing on some worked over vortec's with a good set of springs and valves if cam or RPM dictates it. But I'm completely lost when it comes to pistons and rods. As I understand it, this use to be a pretty popular combo back in the day but not very many people seem to know much about it anymore. I'd like to end up with around 10.75-11:1 and spin it pretty high. Can anyone help with a piston/rod combo? There's gotta be a few old guys on here that know what I'm talking about. Lol
12-15-2014, 02:47 PM
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I have an old sj 283 that's been bored .125 over and the stock forged crank. Engine came out "as a running engine" of an old dirt track car years ago so I should not have and cylinder wall thickness problems. For heads I was just planing on some worked over vortec's with a good set of springs and valves if cam or RPM dictates it. But I'm completely lost when it comes to pistons and rods. As I understand it, this use to be a pretty popular combo back in the day but not very many people seem to know much about it anymore. I'd like to end up with around 10.75-11:1 and spin it pretty high. Can anyone help with a piston/rod combo? There's gotta be a few old guys on here that know what I'm talking about. Lol
12-15-2014, 06:37 PM
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So basically your building a 302! Sounds like it could be a fun
project! A 302 is going to want to spin to at least 7000 or more.
It it was mine I would use a good scat bushed rod with 7/16 arp cap screws and a .100 dome forged piston . If it's in the budget. I think Keith black makes a dome piston for the vortec heads. I would have the heads machined for screw in studs, guide plates, machine valve guides down and cut spring seats so you can run at least a 1.460 spring. Call lunati, comp or crane and let them pick you out a camshaft. I would recommend a 2913 vortec super victor and a 750 carburetor. I have rode in a 69 camaro that was a factory DZ 302, 4 speed car and it would spin 7800 with no problems!
project! A 302 is going to want to spin to at least 7000 or more.
It it was mine I would use a good scat bushed rod with 7/16 arp cap screws and a .100 dome forged piston . If it's in the budget. I think Keith black makes a dome piston for the vortec heads. I would have the heads machined for screw in studs, guide plates, machine valve guides down and cut spring seats so you can run at least a 1.460 spring. Call lunati, comp or crane and let them pick you out a camshaft. I would recommend a 2913 vortec super victor and a 750 carburetor. I have rode in a 69 camaro that was a factory DZ 302, 4 speed car and it would spin 7800 with no problems!
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12-15-2014, 07:35 PM
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This is what I needed to know! It's impossible to find 125 over 283 pistons anymore. That opens up my choices for pistons by 1000%. I just wasn't completely sure the compression hight deference between the standard 350 and 283 pistons.
