Re: Critique my 408 stroker induction
[Re: jst19600]
#1363815
01/03/13 03:00 PM
01/03/13 03:00 PM
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Joined: Jan 2004
Posts: 13,247 Mt. Vernon, Ohio
dartman366
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Mt. Vernon, Ohio
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while my 408 has more compression,(13.0-1) and more cam, .688 roller, (can't remember the duration at this time) I think you could get a little more by going to a 950 cfm carb and maybe a little better header,1.750 to 1.875 and let it breath a little better, strokers like plenum volume but not sure about the air-gap plenum size as I have never used one, possible alt may be a Victor intake as I know these are good intakes also, I run a Indy with a 2" spacer and a 1050 dommy which I know you really dont need that much, I say just a carb change will give good results by it self. jmo
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Critique my 408 stroker induction
[Re: 340_Dart]
#1363817
01/03/13 03:21 PM
01/03/13 03:21 PM
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Joined: Jan 2003
Posts: 9,876 Weddington, N.C.
Streetwize
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master
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Posts: 9,876
Weddington, N.C.
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mildly ported Victor 340, a manifold is cheaper than a new carb, at your weight and stall it's a slam-dunk but you may need to tweak the acc. pump shot and jets. If you can't port it and have to run an OOTB single plane, I'd go with the Holley Strip Dominator or M1. I will say an 850 or larger might be better as well, especially on a dual plane which generally wants 100cfm + (or more) than a single plane to compensate for the plenum split. Good insight to be found on the 587 HP 360, to correlate to a 408 it's.going to generally (rule of thumb cid to cfm) lower the Hp and Torque RPM roughly 10-12% lower for the same head, cam, induction and Cr. While you're at it.... slightly O/T but related, if you get the Schoenfeld 1 7/8 x 3 1/2" slip on collector it's an easy mod to your Headman 1 5/8 -3" headers....I just did it on my 414 and put a 3 1/2" to 3" Flowmaster reducer behind it.
Last edited by Streetwize; 01/03/13 03:44 PM.
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Re: Critique my 408 stroker induction
[Re: Scamp408]
#1363823
01/04/13 04:24 PM
01/04/13 04:24 PM
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Joined: Jan 2003
Posts: 11,718 Portage,michigan
B3422W5
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I Live Here
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Posts: 11,718
Portage,michigan
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This is an off the wall thought i know But if its a bracket car and is working perfectly now, like you said....how about not doing anything and leaving it the way it is. An old saying i heard a while back, " if it dont stink, dont stir it" Anyhow, just a thought
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Critique my 408 stroker induction
[Re: Triple Threat]
#1363826
01/04/13 06:53 PM
01/04/13 06:53 PM
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Joined: Jan 2003
Posts: 9,876 Weddington, N.C.
Streetwize
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Weddington, N.C.
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I think it'll be worth at least between .08 and .14, possibly more in good sea level air once you sort it, the RPM is about maxed out at 6500 rpm on a 370-ish motor which means it's going to be nearly out of it's ability to move more air by ~5800 or so on a 408. Look at the 581 horse 360 thread, that motor has plenty of head flow and you can see the difference the RPM AG vs the Super Victor made, somewhere around 35 hp IIRC. Talk to member Flyfish, he tried the victor against his AG in a similar ET cuda notch, din't like it at first but liked it BETTER(and the ET's dropped) after some carb tuning. I have plenty of hands on and seat time with the Vic and other single planes, I can't speak from experience on the Super victor. FWIW...The 1 3/4" Schoenfeld-slip on style collector will go right over your hacked-off 1 5/8" ( cut it about 1/2"-3/4" behind the cloverleaf) 3" collector and that will also be worth at least another 10th on YOUR EXISTING HEADERS. if the collector is too small (even moreso than the primary tube) it will peak your torque at a fixed RPM and then LOWER the HP trajectory above that peak torque RPM. running 10.80's I'm also assuming your Edelbrocks are worked over a bit to flow another 30-40CFM over stock, is that the case? Do both and jet up accordingly and you'll get AT LEAST 2/10th's
Last edited by Streetwize; 01/04/13 07:11 PM.
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Re: Critique my 408 stroker induction
[Re: Triple Threat]
#1363827
01/04/13 06:57 PM
01/04/13 06:57 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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A single plane will probably kill off too much TQ at low speed VS what it will get you on the top end especially leaving at idle and running a glide. The air gap will have a broader power band even though the peaks may be slightly off VS victor, M1....
An 850 carb however may be a nice addition, should not cost you enough low end to notice when tuned properly but the higher RPM will definitely pull better.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Critique my 408 stroker induction
[Re: HotRodDave]
#1363828
01/04/13 07:04 PM
01/04/13 07:04 PM
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Joined: Jan 2003
Posts: 9,876 Weddington, N.C.
Streetwize
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Joined: Jan 2003
Posts: 9,876
Weddington, N.C.
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Dave, I agree in part but remeber the Glide soaks up something close to 1/2 the comparable amount of engine power to turn at speed than the 904 so that much more power is getting to the wheels; he's got enough stall and he's light enough that I believe he'll pick up....opinions vary I suppose.
A Vic on a 408 is proportionally like a torker 2 on a 360, it'll have PLENTY off the line, at least on any motor I've built.
Last edited by Streetwize; 01/04/13 07:06 PM.
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