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Re: First 408 Stroker Build
[Re: midnite360]
#844036
11/02/10 02:20 PM
11/02/10 02:20 PM
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Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
4speeds4me
master
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master
Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
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My advice, FWIW, would be to start with a Magnum if that's an option. Their heads are better to begin with, so if you need to stick with iron heads to start, it's a smaller handicap. As well, it gets you the option of roller cam without a fancy (read: expensive) conversion piece. If Eddy Magnum heads fit in the budget, I'd do it. Not sure who's got the best bang-for-buck stroker kits these days, but I'd also recommend getting one that was internally balanced. Less hassle in the grand scheme of things. My 
2 Demons...no, not my kids! 
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Re: First 408 Stroker Build
[Re: Baxter61]
#844038
11/02/10 02:40 PM
11/02/10 02:40 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
Too Many Posts
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Posts: 27,468
So Cal
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Quote:
Id start with an LA block,4inch crank, and some RHS head prepped by IMM Engines. I think you'll far surpass your 425hp number for not too much money.
What cam(s) would put you in the 425 range with a decent simple heads (IMM or E-brock).
Sure bigger cams will yield more HP, but looking for mellow and somewhat tame at idle and cruise.
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Re: First 408 Stroker Build
[Re: Mike Miller]
#844042
11/02/10 03:38 PM
11/02/10 03:38 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
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So Cal
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Quote:
Take a good look at the 60403 Lunati VooDoo cam .... if you want a little more, the 60404.
These cams are super good in street motors. They have a ton of low end thru to the redline. I have built several 408's for customers and they all seem to like shifting at 5800 (different cams in all of them including one with a solid roller) so keep that in mind. They will rev way past that but that seems to be a real happy point for the stroke.
How do you think the comp XE274H compares in there? Idle and power wise.
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Re: First 408 Stroker Build
[Re: radar]
#844045
11/02/10 04:35 PM
11/02/10 04:35 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
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So Cal
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Quote:
I'm running the comp 275 extreme high lift cam in my cast crank 408 with ootb eddy heads. It seems like it runs out of steam around 5k or a little higher- runs real good around 4k. I wonder if anybody's got dyno or track #s for my combo. I was tempted to try a bigger cam but it idles pretty well at 950 and I drive mostly on the street...
Anyway for the OP, I do like my cam but just like everything else there are compromises.
It won't idle down much under 950 rpm? Sort of surprised the H/L version runs out of steam at 5,000 rpm.
You have flowmasters on it right? I've seen/heard a video of your car.
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Re: First 408 Stroker Build
[Re: autoxcuda]
#844046
11/02/10 09:22 PM
11/02/10 09:22 PM
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Joined: Jan 2003
Posts: 20,797
A collage of whims
topside
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Posts: 20,797
A collage of whims
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I used an Engle hydraulic flat-tappet in my 406 SB Duster; 214/224 @ .050, .470/.504 lift IIRC. Car ran great, idled smoothly but sounded stout, pulled plenty of vacuum for the power brakes & A/C, pulled 17MPG, had perfect throttle response, pulled to 6000 or so. It runs a Demonsizzler T-Quad on a Performer intake, cleaned up iron heads, basic headers.
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Re: First 408 Stroker Build
[Re: Streetwize]
#844048
11/02/10 11:18 PM
11/02/10 11:18 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
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So Cal
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Quote:
Great hydraulic cam for 408-416 with wall to wall torque and power is the Ultradyne 231/239 @ .050 on 108, IIRC it's like .483/.500 lift.
Gives you the great 'big block' grunt and still pulls to 6K with peak power around 5500
Is that pretty rumpity at idle with its 108 centerline and duration? Is it significantly different sounding/running at idle than the XE275 at idle?
I've got: 416, E-brock heads, TTI's, Edelbrock RPM intake. I'm open to other intakes that fit under my stock hood. And I will clean up the heads some, but I can do more if it will be significant with my combo (I sort of doubt it). I run a 3.23 gear BUT I have really small diameter tires 24.5" that make it act like a 3.55 or more.
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Re: First 408 Stroker Build
[Re: goldmember]
#844050
11/02/10 11:58 PM
11/02/10 11:58 PM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
Too Many Posts
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Posts: 27,468
So Cal
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Quote:
I agree with Wise on using the older UD hyd profiles. The 108lsa with those lobes will give a noticable idle but power brakes "should" still function in a stroker combo,but you could spread them to 110 or even 112 if idle vac is a big deal.They run better than most would think(based on specs.LOL) I use them to replace other hyd grinds and they work great. Tim @ Bullet racing cams can get you the cam you need.
Not looking for noticable idle. I don't have power brakes or A/C. Just not looking for that attention and noise.
By grinding 110 or 112 on that ultradyne are you hurting it much? Or better start with something different.
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Re: First 408 Stroker Build
[Re: goldmember]
#844052
11/03/10 03:13 AM
11/03/10 03:13 AM
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Joined: Jan 2003
Posts: 27,468
So Cal
autoxcuda
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Too Many Posts
Joined: Jan 2003
Posts: 27,468
So Cal
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Quote:
Quote:
Quote:
I agree with Wise on using the older UD hyd profiles. The 108lsa with those lobes will give a noticable idle but power brakes "should" still function in a stroker combo,but you could spread them to 110 or even 112 if idle vac is a big deal.They run better than most would think(based on specs.LOL) I use them to replace other hyd grinds and they work great. Tim @ Bullet racing cams can get you the cam you need.
Not looking for noticable idle. I don't have power brakes or A/C. Just not looking for that attention and noise.
By grinding 110 or 112 on that ultradyne are you hurting it much? Or better start with something different.
So you want a stock idle,like a stock 318/360 truck engine? As far as spreading the lobes to 112lsa yes, it will tame the idle and even the 108 isn't exactly radical in a 408.
I've got the P4452761 .268°/272°, 228°/231° @.050, .450/.455, 110° cam in there now with 340. And I'm familar with a XE268 in a 340. I can tolerate a next step louder than those.
Are you saying a 416 stroker gobbles up some of that smaller centerline effect? I've heard that.
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Re: First 408 Stroker Build
[Re: autoxcuda]
#844053
11/03/10 07:38 AM
11/03/10 07:38 AM
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Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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That ud is choppy but still very streetable in a 340-360 but not bad at all manners-wise. But in a 10:1 408 it's all about wall to wall torque, awesome kick down and roll on power coupled with a great, 'just right' idle. I've built dozens of strokers of all makes and to my mind and experience there's not a better all around grind for a mild street 4" stroke SBM; throw on a pair of decent heads, 1 5/8" headers and an RPM or RPM/AG intake with a 750DP and you'll have the perfect combo. With this cam's lobes the 108 lobe spread will not upset a 4" stroke motor, you put the UD in at 102 in a heavier car (like a B or E or Truck) and 105 in a light A-body. Gearing really doesn't matter, the motor has such good all-around torque (like a wall to wall "sweet spot')it really doesn't care, and this cam's timing doesn't give you a ton of effective @ .050 overlap anyway. For a vert something as simple as a factory 340 or 383 road runnner high stall vert is the perfect 'low buck' match but a tight T/A 10" is even better. What a lot of people don't seem to get with long arm motors is that cam phasing can be every bit as critical as the grind itself, And I've found you need at least 228-230 degrees on the intake for a 408 to be happy above 5K, with conventional heads and valve sizes a too small profile will hurt the top more than it helps the bottom.
Last edited by Streetwize; 11/03/10 09:43 AM.
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