383 ls6 wanting close to 500 rwhp
02-02-2013, 11:36 AM
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383 ls6 wanting close to 500 rwhp hey guys im just curious what i could do to get closer to the500 rwhp range. im at 458 rwhp now. got a 383 ls6 motor. running 11.5 c/r forged bottom end. slp stainless long tubes, ported and polished ls6 heads, ported intake and cam is a .620/624 lift and a 235/247 @ .050 with a 114 lsa. intake was fitted with a aftermarket 80 m throttlebody corvette maf, 36 lbs injectors. 10.5mm spark plug wires behind a bult t56. i know i want to change the intake. heard bbk was middle calss but weighs alot. and fast. idk if i would gain the best bang idk. is there any restrictions anywhere that im unaware?? please help thanks
02-02-2013, 05:02 PM
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More details on exhaust set up? I think you could see good gains with a ported fast and possibly a better header/exhaust maybe an under drive pulley, electric water pump.
Lots of options to pick up some more power IMO.
Lots of options to pick up some more power IMO.
02-03-2013, 12:55 PM
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Headers im not 100% sure on the size of the slp stainless longtubes. I bought this car off individual. Snd the cam was made for a ls7. But was good cam for the 383. Heads I know have port and polish ss valves double springs titanium retainers. Budget is flexable. Idk if I wanna switch out yhe heads. But do wanna change intske tb and maf or injectors if needed. Exhaust is also duels with high flow cats. He had to pass certain georgoa inspections to drive on street. But laws are diff in Oklahoma and Arkansas
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02-04-2013, 07:25 AM
#9
Its expensive but not impossible. You just need good parts that work well together. I could never get an accurate dyno pull with my drivetrain but track numbers suggest it was in the 450whp range with a relatively stock top end and small headers. I just got a Fast 90 and plan on ordering some Trick flow 220s or PRC 225s and should be close to 500rwp.
03-02-2013, 12:24 AM
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budget not really important but i dont wanna throw money away. and i hear the tfs 225 or the afr 230s?... are pretty damn good. and my 243 heads are cncd. and another question why not polish alum heads?
03-02-2013, 02:02 AM
#13
450 hp is alot for the street, there might be more power had by tweaking suspension, gears, rear... something to think about
a properly setup 450 hp will eat a 500 hp car up if its setup better, especially on the street...
03-02-2013, 10:19 AM
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burken, it has everything built. strange driveshaft, dana strange 60 and gears, suspension i have to change, i bought it guy had it lowered. (looks good) but rough and no traction, and the heads choice. i really dont know which one would fit without having issues. i would like a better head then the cncd ls6s
03-02-2013, 03:57 PM
#16
450hp is no slouch by any means, but completely 100% street able. I'm a fan of AFR's myself, and with a 383 those new 215's are sweet. I personally think you'll lose a bit downlow with a 225.
A properly set-up 383 should hit 500 no issue. I hit the #'s in my sig with a set of used AFR 205's and a bone stock unported fast92.
If I go 393 like I'm wanting I'll sell the damn car if I don't hit 500
A properly set-up 383 should hit 500 no issue. I hit the #'s in my sig with a set of used AFR 205's and a bone stock unported fast92.
If I go 393 like I'm wanting I'll sell the damn car if I don't hit 500
03-02-2013, 04:32 PM
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It always sucks to replace the parts you already upgraded (for me anyway) but thats the only way you are going to get there. I like the prc stuff and 227's would work really nice. Fast 102 for the intake. Its not a huge gain but there is power in a header swap. I love SLP loudmouth and some of their other products, but their headers suck imo. They drag the ground almost and make less power than the more known brands. I picked up 10rwhp switching to Kooks on a h/c car with the same size primaries.
500rwhp can be done with your setup, but I think you are going to be doing it about 10hp at a time at this point.
500rwhp can be done with your setup, but I think you are going to be doing it about 10hp at a time at this point.
03-02-2013, 10:11 PM
#18
burken, it has everything built. strange driveshaft, dana strange 60 and gears, suspension i have to change, i bought it guy had it lowered. (looks good) but rough and no traction, and the heads choice. i really dont know which one would fit without having issues. i would like a better head then the cncd ls6s
It's tough when you are trying to fine tune a setup to chase down 30-40 hp... even if itll cost you 1k-2k
But if you love your car like me, then the money is no object...
03-02-2013, 10:20 PM
#19
That's why I go with more than than I need the first time so I don't have to go back and swap out stuff down the line. With that said, you have some decent stuff you could sell to recoup some of the cost of the newer items.
But for 500rwhp, the airflow for that engine isn't good enough. You need the biggest lid you can find, a ported FAST 102, and 1-7/8" headers with either dual cutouts, a 4" y-pipe, or true duals, and heads that were either ported by a top porter like TEA or Ai, or aftermarket castings like AFR/TFS/PRC. Otherwise the cam should be fine for 500rwhp in a 383 if the heads are up to snuff and are allowed to inhale and exhale well. You also need to make sure all the little things are done right. Correct pushrod length/preload, correct valvetrain geometry, proper and tight quench, spot on tune, etc.
But for 500rwhp, the airflow for that engine isn't good enough. You need the biggest lid you can find, a ported FAST 102, and 1-7/8" headers with either dual cutouts, a 4" y-pipe, or true duals, and heads that were either ported by a top porter like TEA or Ai, or aftermarket castings like AFR/TFS/PRC. Otherwise the cam should be fine for 500rwhp in a 383 if the heads are up to snuff and are allowed to inhale and exhale well. You also need to make sure all the little things are done right. Correct pushrod length/preload, correct valvetrain geometry, proper and tight quench, spot on tune, etc.
03-02-2013, 10:24 PM
#20
That's why I go with more than than I need the first time so I don't have to go back and swap out stuff down the line. With that said, you have some decent stuff you could sell to recoup some of the cost of the newer items.
But for 500rwhp, the airflow for that engine isn't good enough. You need the biggest lid you can find, a ported FAST 102, and 1-7/8" headers with either dual cutouts, a 4" y-pipe, or true duals, and heads that were either ported by a top porter like TEA or Ai, or aftermarket castings like AFR/TFS/PRC. Otherwise the cam should be fine for 500rwhp in a 383 if the heads are up to snuff and are allowed to inhale and exhale well. You also need to make sure all the little things are done right. Correct pushrod length/preload, correct valvetrain geometry, proper and tight quench, spot on tune, etc.
But for 500rwhp, the airflow for that engine isn't good enough. You need the biggest lid you can find, a ported FAST 102, and 1-7/8" headers with either dual cutouts, a 4" y-pipe, or true duals, and heads that were either ported by a top porter like TEA or Ai, or aftermarket castings like AFR/TFS/PRC. Otherwise the cam should be fine for 500rwhp in a 383 if the heads are up to snuff and are allowed to inhale and exhale well. You also need to make sure all the little things are done right. Correct pushrod length/preload, correct valvetrain geometry, proper and tight quench, spot on tune, etc.