402 dyno question?
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Teching In
Joined: Jul 2005
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402 dyno question? a bit broad/vague but a 402, afr225 heads, mild cam (228/232 114lsa), long tubes, fast intake....would you expect that to hit over 500rwhp?
Last edited by runningman; Aug 15, 2010 at 11:12 PM.
You didn't mention through what drive train? That makes a difference.
6 yrs ago with TEA ported 6.0 heads, out of the box FAST 90, kooks 1 7/8 long tubes, and a 236/236 cam, a buddy of mines 402 made 505 through a cutout on a conservative dyno (Total Engine Air Flow when they were still in Bowling Green KY). This was through a T56 and 12 bolt with 3.73s.
With that said, I don't see why you can't hit your goal with a mild cam, and the cam you listed wouldn't be mild for a 402, that would be small.
6 yrs ago with TEA ported 6.0 heads, out of the box FAST 90, kooks 1 7/8 long tubes, and a 236/236 cam, a buddy of mines 402 made 505 through a cutout on a conservative dyno (Total Engine Air Flow when they were still in Bowling Green KY). This was through a T56 and 12 bolt with 3.73s.
With that said, I don't see why you can't hit your goal with a mild cam, and the cam you listed wouldn't be mild for a 402, that would be small.
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#'s in sig on TFS 220cc as cast heads, ported 90/90 and an EPS 238/250 cam. Thru 1 3/4" headers, cats and a Hooker catback which is all holding me back....
Last edited by SOMbitch; Sep 22, 2010 at 10:21 AM.
if your tuner cant get rid of that.. then you need to get a different tuner
I can get a 250ish duration car to drive just fine
I just finished up my 408 motor...waiting on clutch to come in to do install...
expecting to see 525hp to the wheels and spinning it to 7000/7500
408 lq9 11.15:1
240/244 cam
PRC 227 heads
Fast 92/92
100mm Lid
kooks 1-7/8 headers
No MAF
T56 with stage 5 Monster Clutch
and yes... Tuned by me
and yes.. I've done this before..LOL
That cam is great in an ls1 but tiny is a 402, a similar cam for a 402 would be a 242/246. It should still have good drivability with a good tune too. Maybe even the new afr 230 v2 heads instead of the old 225s. That would exceed 500rwhp with mostly any drivetrain and able to breath. (Fast 102mm, 1-7/8 headers)
I had a 244/248 6 teen lift in my old 402, 13 to 1 compression, et 240cc head, fast 90, stock maf, 1 3/4 headers... it made 480rwhp thru a Th400 adn 5200 n/a converter.
It ran 10.50 @ 3600 lbs like nothing as well.
same motor, single 65 nitrous jet, 3350 lb raceweight, nitrous converter went 9.5x like it was nothing as well. This, idles fine, and was about as tame as I think a motor for this type could be.
408 I have sitting in the garage now, is 14.5 to 1 compression, and has a 266/272 solid roller cam with abotu 740 lift, plus 1.8 ratio rockers. This one will be a little more agressive I think. Still not crazy though, and I have about .180 worth of clearance on both the intake and exhaust, so I can go a little bigger.. and might before I even fire it up.
It ran 10.50 @ 3600 lbs like nothing as well.
same motor, single 65 nitrous jet, 3350 lb raceweight, nitrous converter went 9.5x like it was nothing as well. This, idles fine, and was about as tame as I think a motor for this type could be.
408 I have sitting in the garage now, is 14.5 to 1 compression, and has a 266/272 solid roller cam with abotu 740 lift, plus 1.8 ratio rockers. This one will be a little more agressive I think. Still not crazy though, and I have about .180 worth of clearance on both the intake and exhaust, so I can go a little bigger.. and might before I even fire it up.
Staging Lane
Joined: Jan 2010
Posts: 68
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Here are some dyno numbers for my 402 LS2 w/ L92 heads. On the initial build I opted to go with a cam that speced out as 236/236 .598/.598 112. This cam yielded great max hp and tq numbers (499 hp and 468 tq) but suffered from poor driveability because I was using L92 heads and reversion was getting to be a pain and quite frankly got old driving this car around town.
The second cam speced out as 224/236 .612/.612 117.5 LSA. As expected the max numbers were lower (467 hp and 457 tq) on the topend but the overall driveability has improved dramatically. As a part of the swap I also upgraded the springs to accomodate the additional lift.
The second cam speced out as 224/236 .612/.612 117.5 LSA. As expected the max numbers were lower (467 hp and 457 tq) on the topend but the overall driveability has improved dramatically. As a part of the swap I also upgraded the springs to accomodate the additional lift.
Mike you would have been better off just increasing the exhaust duration, and the lsa a little bit then going that much smaller. You probably would have gotten the drivability you were looking for, and not lost anywhere near the power.
This will be the um-teen-th time I've posted my #'s but...
iron 408 w/ -2cc reliefs (i know it isn't a 402 but its close enough).
-PRC 2.5 5.3 heads undecked (61cc chambers)
-MS3 (237/242 .603/.609 114LSA)
-ported FAST92/95
-ARH 1 7/8" longtubes
-85mm Z06 MAF
-S60 with 4.10s
Everyone said I wouldn't crack 500whp but might get close.
Car made 508whp/479wtq through a t56 with a "great tuner" (<<<which is key). If I was an auto, no way in hell would I have cracked that #.
With that cam though, you will have a hell of a time in my opinion. It just isn't big enough like everyone else is saying. The car would still run like a raped ape don't get me wrong, making an awesome torque curve and down low power for sure. Hell my MS3 in that 408 started cracking 400wtq at like 2700rpm (<<<insane!!!!). Those heads will do you good but you should go a little bigger on the cam bro, truthfully.
I hit these #'s with fricking PRC 5.3 heads, bump that cam up and you will make some awesome power with those AFRs.
iron 408 w/ -2cc reliefs (i know it isn't a 402 but its close enough).
-PRC 2.5 5.3 heads undecked (61cc chambers)
-MS3 (237/242 .603/.609 114LSA)
-ported FAST92/95
-ARH 1 7/8" longtubes
-85mm Z06 MAF
-S60 with 4.10s
Everyone said I wouldn't crack 500whp but might get close.
Car made 508whp/479wtq through a t56 with a "great tuner" (<<<which is key). If I was an auto, no way in hell would I have cracked that #.
With that cam though, you will have a hell of a time in my opinion. It just isn't big enough like everyone else is saying. The car would still run like a raped ape don't get me wrong, making an awesome torque curve and down low power for sure. Hell my MS3 in that 408 started cracking 400wtq at like 2700rpm (<<<insane!!!!). Those heads will do you good but you should go a little bigger on the cam bro, truthfully.
I hit these #'s with fricking PRC 5.3 heads, bump that cam up and you will make some awesome power with those AFRs.
Last edited by DVS99TRANS; Sep 24, 2010 at 04:09 PM.
On The Tree
Joined: Nov 2005
Posts: 186
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This will be the um-teen-th time I've posted my #'s but...
iron 408 w/ -2cc reliefs (i know it isn't a 402 but its close enough).
-PRC 2.5 5.3 heads undecked (61cc chambers)
-MS3 (237/242 .603/.609 114LSA)
-ported FAST92/95
-ARH 1 7/8" longtubes
-85mm Z06 MAF
-S60 with 4.10s
Everyone said I wouldn't crack 500whp but might get close.
Car made 508whp/479wtq through a t56 with a "great tuner" (<<<which is key). If I was an auto, no way in hell would I have cracked that #.
With that cam though, you will have a hell of a time in my opinion. It just isn't big enough like everyone else is saying. The car would still run like a raped ape don't get me wrong, making an awesome torque curve and down low power for sure. Hell my MS3 in that 408 started cracking 400wtq at like 2700rpm (<<<insane!!!!). Those heads will do you good but you should go a little bigger on the cam bro, truthfully.
I hit these #'s with fricking PRC 5.3 heads, bump that cam up and you will make some awesome power with those AFRs.
iron 408 w/ -2cc reliefs (i know it isn't a 402 but its close enough).
-PRC 2.5 5.3 heads undecked (61cc chambers)
-MS3 (237/242 .603/.609 114LSA)
-ported FAST92/95
-ARH 1 7/8" longtubes
-85mm Z06 MAF
-S60 with 4.10s
Everyone said I wouldn't crack 500whp but might get close.
Car made 508whp/479wtq through a t56 with a "great tuner" (<<<which is key). If I was an auto, no way in hell would I have cracked that #.
With that cam though, you will have a hell of a time in my opinion. It just isn't big enough like everyone else is saying. The car would still run like a raped ape don't get me wrong, making an awesome torque curve and down low power for sure. Hell my MS3 in that 408 started cracking 400wtq at like 2700rpm (<<<insane!!!!). Those heads will do you good but you should go a little bigger on the cam bro, truthfully.
I hit these #'s with fricking PRC 5.3 heads, bump that cam up and you will make some awesome power with those AFRs.
^^^^ I'm running 90 octane up here in Alaska. Thats all there is here, don't ask me I have no idea lol. I should be detonating my *** off but I'm not. Runs like a raped ape too 
I am running 45 head gaskets also???
I am running 45 head gaskets also??? If you're limited with the fuel, I'd keep the compression at 11 to 1. Honestly, there is more power to be made with added compression, but there's certainly the risk of having detonation problems.
I ran nothing but race fuel in my old motor, and it made 480 thri an unlocked TH400/5200 converter with slicks.
Had that been a T56/radial tire deal I'm sure it would have been 550. And, that was with what I'd consider a smallish cam for a motor that big (244/248 6.teen lift)
If I had a big cam, like a 256/262 with 630ish lift, and a carb intake on it, I think 500 thru the auto, was a possibility. Now with the solid roller 266/273 740 lift and 14 to 1 compression I'm expecting about 570 thru a glide from it, and it should make power to 8000.
We'll see though. Motor is listed for sale as well (brand new never fired) as I am not 100% that it will be enough for what I have planned (8.50 index, with as little nitrous as possible, none in a perfect world)
Car's also gonna be about 2800 to 2850 when it's done, so I have about 500 lbs less to push down the track to... that should help.
I ran nothing but race fuel in my old motor, and it made 480 thri an unlocked TH400/5200 converter with slicks.
Had that been a T56/radial tire deal I'm sure it would have been 550. And, that was with what I'd consider a smallish cam for a motor that big (244/248 6.teen lift)
If I had a big cam, like a 256/262 with 630ish lift, and a carb intake on it, I think 500 thru the auto, was a possibility. Now with the solid roller 266/273 740 lift and 14 to 1 compression I'm expecting about 570 thru a glide from it, and it should make power to 8000.
We'll see though. Motor is listed for sale as well (brand new never fired) as I am not 100% that it will be enough for what I have planned (8.50 index, with as little nitrous as possible, none in a perfect world)
Car's also gonna be about 2800 to 2850 when it's done, so I have about 500 lbs less to push down the track to... that should help.