408 predictions

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Jan 28, 2011 | 07:52 PM

jhall

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From: cedar park,tx

408 predictions

The block is at the machine shop and i have just about got all the other parts on hand or on order. As always, spent more than i thought, anyways just trying to get some predictions on the power the new setup will make

6.0L 408 stroker
Callies Compstar Crank and rods
Wiseco -3cc pistons
custom grind Comp Cam 231/239 .617/.623 114 LSA
ls3 intake
LS3 heads with runners smoothed out with good springs
102mm lid,maf, and TB
Yella Terra Rockers
1 3/4 QTP LT Headers
Yank 4000ss stall
built tranny
strange 12 bolt rearend with 3.91 gears
magna flow without cats

I'm hoping for 480/480 what do you think...

Last edited by jhall; Jan 28, 2011 at 08:02 PM.

Jan 28, 2011 | 08:26 PM

SOMbitch

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I think you'll see a bit more on the HP side....

Jan 28, 2011 | 08:46 PM

94 guy

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ditch the rockers and run stock

Jan 29, 2011 | 07:35 AM

jhall

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From: cedar park,tx

Why do you think I should ditch the rockers? They are a little pricey but after the beariing upgrade to the stock rockers and actually picking up a set, i figured I would only be out $200.00 or so.

Jan 29, 2011 | 08:53 AM

SOMbitch

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I think why he is saying that is the stamped steel stockers are stronger and lighter. Proper spring though and the weight won't be an issue. And the wipe on the valve tip can be set narrower with the YT's if you take the time to do it which you should since your cam has decent lift... vettenuts has a good "how to" writeup in gen III internal if you can find it.

Jan 29, 2011 | 09:10 AM

PewterM6SS

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bigger headers

Jan 29, 2011 | 12:46 PM

jhall

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From: cedar park,tx

With the money I am spending on this, they will have to come further down the road. If I'm not happy with the results that is something I will have to look into.

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Jan 30, 2011 | 12:20 AM

jhall

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From: cedar park,tx

Damn no love for the Terra's. I have them on order now. I have been told due to the rather high lift on the cam the wipe on the valves will be better with these rockers also I like the fact that the needle bearings are sealed compared to the stockers. Any bad info on the Terra's I dont know about? I may be able to ship them back minus shipping if there is **** i dont know about them.

Jan 30, 2011 | 03:52 PM

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madden

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I'm going to guess 467 hp.
Quarter mile: 11.0 @ 121 mph

Jan 30, 2011 | 05:21 PM

#11

99LSS1

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Quote:

Originally Posted by jhall

Good guess on the HP, But unfortunately through an A-4 and 12 bolt the TQ #'s always show up a bit low on the Dyno!!! My set-up is similar and I got 461rwhp, Can't remember the tq #'s, but they were unusually low... The real test is at the track.. 10.94@124mph!!! Once I change from 3.50 gears to 3.90's, I expect to pick up a bit more on the ET side. Just remember Dyno #'s might look good on paper, But the performance of the car is what is really important. Good luck with your build

Jan 30, 2011 | 08:40 PM

#12

SOMbitch

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My #'s are on a dynojet and I will almost guarantee you will beat me on a DJ...... I think you have a nice setup but like me would pick up a few with a bigger/better exhaust....

IMO you will better your HP guess but your TQ. guess will be a little tougher

Jan 31, 2011 | 12:10 AM

#13

jhall

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From: cedar park,tx

Thanks for the input . Will post up the dyno sheet once I get the motor installed and broken in.The motor will be dynoed on a dynapak dyno as well.

Feb 2, 2011 | 02:59 AM

#14

jimbob

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Quote:

Originally Posted by jhall

Unless you dyno way off (say less than 420), I would not worry to much about the numbers you put down. I have that SS4k and it flashes to 5500 on My old school LT1 401 stroker and my extension is 700 rpm max. Anyway, unlocked that verter looses a lot on a dyno (between 20-30 more rwhp over SS3600). You'll have one hell of an average hp though, and that's what counts. I would not trust a SS4000 (locking the verter) against that stroker. It might not lose it (slip the lock up clutch) but eventually it will cause problems. Ask me how I know, that was very expensive lesson.

Feb 4, 2011 | 01:12 AM

#15

DVS99TRANS

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It will certainly be a drivable setup, other than the 4000 stall you have and will make a great torque line (probably wouldn't call it a curve more than likely). I will be another to say 1 7/8" longtubes, hitting 402/408 is where the difference will begin to show. I would stick with the Yellas though, if you move to a TFS head later then roller rockers are required. Post up those #'s fella, curious to see what she does all said and done.

Feb 5, 2011 | 11:41 AM

#16

sergo

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From: Las Colinas, TX

what's the compression going to be?

gears/stall ~ 460/450 on dyno.
should run damn good though.

Feb 5, 2011 | 12:27 PM

#17

jhall

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From: cedar park,tx

Compression should be 11:2 to 1 or so. I'm sure the dyno numbers will not be stellar going through my drive line and all, I definally will not be locking the converter. I,ve heard the Circle D converters can take it but not going to chance it with the Yank.Motor is still at the machine shop and still gathering a few of the odds and ins for the build.May be installing the heads unported due to the money I have been spending on this.I figure when i need a little more i may slap a 125 shot or so on it. Goal for install is 2-3 weeks. My last setup only put down 385/370 and ran 11.7 so I will be baseing the improvements from there.