What numbers do yall think my z28 will put out on the dyno on monday??
05-02-2012, 10:08 AM
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What numbers do yall think my z28 will put out on the dyno on monday?? I have a 1996 Z28 with a fresh rebuilt lt1. First off it has a small comp cam (224/230, 510 lift), it has ls6 beehive springs, eagle rods, hooked headers, catless y pipe, magnaflow catback, a 383 stroker crank? I'm reading all of this from all of the receipts I received with the purchase of the vehicle. Electric fuel pump, and a lot of small things. What do tall think it will put down? Its automatic also. 
05-02-2012, 10:28 AM
#5
320hp if the springs manage to keep it under control for some rpm which I have some doubts about. Yes the LS6 has more lift than that but it gets it lift from ratio and does so on a larger base circle and has lighter valves all of which make it easier to control.
I think it is a Comp 503 cam which is not "small" it is hugely popular and a good performer if supported properly, it is a little mild for a 383 but if you have a cast crank which just fits into what little you have said then you do not want any bigger because you will be lucky if this stays together.
If someone made choices that bad I bet the heads are as cast with a cast crank, both HUGE mistakes.
Electric fuel pump is stock, maybe they upgraded it but for this there was no need.
I sincerely hope you are just wrong about what you bought because that would be better than what it looks like you have. Or that I am making too many assumptions and some of the parts are actually good. That said after more than a decade on forums like this I have seen similar stories play out way too often. Just like this current thread.
https://ls1tech.com/forums/lt1-lt4-m...oob-383-a.html
Based on that guys results I think my estimates for you are generous if anything, his being an M6 helps his numbers, his cam is smaller but likely has enough valvespring unlike your setup.
Do you have part numbers for the engine components?
I think it is a Comp 503 cam which is not "small" it is hugely popular and a good performer if supported properly, it is a little mild for a 383 but if you have a cast crank which just fits into what little you have said then you do not want any bigger because you will be lucky if this stays together.
If someone made choices that bad I bet the heads are as cast with a cast crank, both HUGE mistakes.
Electric fuel pump is stock, maybe they upgraded it but for this there was no need.
I sincerely hope you are just wrong about what you bought because that would be better than what it looks like you have. Or that I am making too many assumptions and some of the parts are actually good. That said after more than a decade on forums like this I have seen similar stories play out way too often. Just like this current thread.
https://ls1tech.com/forums/lt1-lt4-m...oob-383-a.html
Based on that guys results I think my estimates for you are generous if anything, his being an M6 helps his numbers, his cam is smaller but likely has enough valvespring unlike your setup.
Do you have part numbers for the engine components?
05-02-2012, 10:36 AM
#6
LOL....somebody had a thread exactly like this yesterday....383, small cam, stock heads....expect +/-315 RWHP 330 RWTQ. Look into some ported heads if you want any much more HP than that...be warned, this thread could get ugly...people 'round here don't take kindly to 383 setups with non-ported heads and cast cranks and aren't afraid to flame you for it 
Good luck...let us know what it puts down.
Good luck...let us know what it puts down.
05-02-2012, 10:44 AM
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Well my uncle has a dragonslayer crank for the lt1 he said he would let me have for 400 should I get that? Are yall saying I have a 383? I'm flipping confused. Ive never went this in depth as far as mods. I used to have an 02 ws6 cammed that ran good but I've never dynoed a car lol. Only 19 heard old.
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05-02-2012, 11:38 AM
#10
Well my uncle has a dragonslayer crank for the lt1 he said he would let me have for 400 should I get that? Are yall saying I have a 383? I'm flipping confused. Ive never went this in depth as far as mods. I used to have an 02 ws6 cammed that ran good but I've never dynoed a car lol. Only 19 heard old.
You're the one who said it had a 383 stroker crank in your first post...if this is true, then yea, you got 383 CI due to 3.75" stroke vs stock 3.48" crank. I would start over from scratch if you don't know what you got... 
05-02-2012, 01:05 PM
#17
I can elaborate, massive float from completely the wrong springs.
The spring Comp specs has 35lbs. more on the seat with roughly the same rate. With the LS6 spring being limited to .550-.580 lift depending on year or source of info I don't think it could be shimmed enough to work because you would stack it solid at peak lift before it had enough seat pressure.
The spring Comp specs has 35lbs. more on the seat with roughly the same rate. With the LS6 spring being limited to .550-.580 lift depending on year or source of info I don't think it could be shimmed enough to work because you would stack it solid at peak lift before it had enough seat pressure.
05-02-2012, 01:12 PM
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On the receipts it said beehive springs ls6/ls1/ some other stuff. I'll look at it again. What should I do now? What kind of springs should I get? I'm only looking for help man.
05-02-2012, 01:16 PM
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I would be so made when you pull up to a stop light having that car and a grandma Buick grand sport kicks the **** out of you. I most bolt on cars at going to Dyno better numbers