Can I hit 550 to 575rwhp with a 408 stroker
11-07-2005, 08:34 PM
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Can I hit 550 to 575rwhp with a 408 stroker I about to start building a 408 stroker. I would like to hit 550 to 575rwhp on regular pumped gas. Any suggestions on cam size, compression, or anything that I would need. Anyone with a 408, please let me know your dyno numbers.
11-07-2005, 10:43 PM
#3
Exactly, the top-end of the motor is the key to making power. Heads, intake and cam all need to be top notch. As mentioned, the AFR 225s or ET Performance 240+ heads, a ported FAST 90/90 intake/tb, no MAF, and a cam matched to the airflow characteristics of the above. Don't cut corners on the heads as they hold the key to making 575 rwhp. Only a small number of members on this board have made numbers at or above your goal so keep in mind that if it were easy, you'd be seeing everybody making that kind of power. Sadly, there are more 475 rwhp 408s than there are 575 rwhp 408s. Good luck.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
11-08-2005, 08:42 AM
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I made 550 with 5.7L heads and a medium sized cam, but maxed the heads out. this is with 12.8:1 also. I mix a little 104 in with our 91 pump gas. with a GOOD set of LS6 or 6.0L heads you may be able to reach 550rwhp on pump gas SAFELY. to get 575 you are going to need some ET performance or other aftermarket head.
11-08-2005, 10:44 AM
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575 is possible with some experimenting. I did it with some 4 year old MTI heads (not saying they're bad heads), and on pump gas. I'm no talking 93 pump gas either, more like 89 
. Of course, it took 4 or 5 cam changes to get that goal also.
. Of course, it took 4 or 5 cam changes to get that goal also.
11-08-2005, 10:59 AM
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Originally Posted by jeremym
I about to start building a 408 stroker. I would like to hit 550 to 575rwhp on regular pumped gas. Any suggestions on cam size, compression, or anything that I would need. Anyone with a 408, please let me know your dyno numbers.
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11-08-2005, 11:44 AM
#8
what about the motor i have a sponsor putting together rite now. 408. et 240s, fast 90 portmatched, 12:1, cam is still in the works 25x 26x 650lift, jesel ss rockers, kooks 17/8 stepped to2inch
11-08-2005, 12:24 PM
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Originally Posted by ls1408cp
what about the motor i have a sponsor putting together rite now. 408. et 240s, fast 90 portmatched, 12:1, cam is still in the works 25x 26x 650lift, jesel ss rockers, kooks 17/8 stepped to2inch
11-08-2005, 12:41 PM
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its definitely possible but not easy
i'd say that 530ish is pretty easy and that last 20-40hp requires that your components are top end and somewhat on the ege
i'd say u have to run a 250+ duration cam and close to 12:1 duration and have excellent heads
i'd say that 530ish is pretty easy and that last 20-40hp requires that your components are top end and somewhat on the ege
i'd say u have to run a 250+ duration cam and close to 12:1 duration and have excellent heads
11-08-2005, 02:09 PM
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Originally Posted by Patrick G
Sadly, there are more 475 rwhp 408s than there are 575 rwhp 408s. Good luck.
11-08-2005, 05:02 PM
#13
The thing you have to watch out for in these equations is the "big" factor. Big heads, big cam, etc means big rpm's to see the power. A quality set of heads and a mild camshaft will produce excellent numbers over a huge cam and decent heads. Notice the power levels that A&A is reaching with the new ET heads. Quality parts that do what they are meant to do mean quality results. Basically, don't skimp on the heads.
11-10-2005, 04:54 PM
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if you are wanting an awesome street motor that sees some track time, stick with 1 3/4 headers and a little smaller cam. something like a 246/250. you will have a LOT more tq down low and till put up great 'peak' numbers.
11-10-2005, 04:54 PM
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if you are wanting an awesome street motor that sees some track time, stick with 1 3/4 headers and a little smaller cam. something like a 246/250. you will have a LOT more tq down low and till put up great 'peak' numbers.
11-11-2005, 06:43 AM
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Originally Posted by mattkimsey
Can you run 12:1: compression on pump gas 93 octane?
11-13-2005, 08:04 AM
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I've run mine close to a 13:1 with a .028 quench and have no problems on 91 octane. Dynamic compression with my 52.9 ABBC is 10.10:1. I do mix in a little 104 to race though...