Looking for dyno numbers for guys running a 331 or 408 from out of box (untouched) Victor Jr. heads.
Victor Jrs. on 331 or 408: What are your dyno numbers?
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5.0 HOtrain
Founding Member
I answered you're question on the corral, but with TFS "R" heads wich are maybe $150-$200 on my 418 are out of the box on pump gas made the #'s in the sig.
mike.
mike.
the vic jrs will make prolly close to 400 rwhp out the box. that is with all of the right things like cam, meter, injectors, blah blah blah 
You should have no problem making 500RWHP with them on a well built 408, with a good matched combo.
On the 331, 400RWHP can be had but the set-up gets a little wild and components have to be matched perfect. That peak numbner usually comes high in the rpm range.
We really need to know if this is a street car on pump gas, or a weekend warrior/race car that uses race gas? Hyd or soild roller? Auto or Manual? EFI or Carb? Rpm Range desired? What your goals are. This will greatly effect power output..
On the 331, 400RWHP can be had but the set-up gets a little wild and components have to be matched perfect. That peak numbner usually comes high in the rpm range.
We really need to know if this is a street car on pump gas, or a weekend warrior/race car that uses race gas? Hyd or soild roller? Auto or Manual? EFI or Carb? Rpm Range desired? What your goals are. This will greatly effect power output..
slvr, im still debating on getting the heads. i replied on corral also.....
its them or afr 185s.
its them or afr 185s.
Rick 91GT said:
Glad you asked. Here's what I have and looking for.
Car is a street car and will run on pump gas.
Hydraulic roller
5 SPD with EFI
3:73 gears
2000 rpms - 6500 rpms
I was going to build a 408 with 8.5 - 8.7 static compression.
I have an S-Trim from my old combo.
I am looking for 600 rwhp/600 rwtq and dont want to spin the crap out of the blower.
5.0 HOtrain
Founding Member
I'm no blower expert, but wouldnt an "S" trim be a little small for a 408 with high flowing heads?? 
mike.
mike.
5.0 HOtrain said:I'm no blower expert, but wouldnt an "S" trim be a little small for a 408 with high flowing heads??
mike.
I think the S-trim may be too small but before I go for an upgrade, I'd bolt it on first to see if I can't achieve my 600rhwp/600rwtq goal. If not I'd upgrade to a T-trim
slvr302 said:
A power adder totally changes everything, since you are just forcing air into the runners.
I would want the head with the larger ports (runner cc), personally on a 408 I would go AFR225 or another comparable head. I would go YS-Trim as well, the T-trim seems to be peaky and they like to spin from what I know.
600hp should not be that hard to obtain....
NOW if it is a 331 the S-trim would be better suited but I think a larger blower would not stress as much..
I have a 358ci motor, worked AFR225's, ATI F1R air/water and plan to make 1200RWHP+.
Where is the cheapest place to get the AFR 225 and do they require anything special for the headers to bolt up?
dude, I made 516/570 at only 4900 on a pump gas Twisted Wedge headed 342. If you cant make 600 at the wheels with a 408 and big heads you have a problem. A blown 331 with AFR 185s would be an excellent combo that would get you 600. If your just looking to make the most power but be streetable then I would go with the Vic Jr headed 408. The Vics are a 210 intake runner so slightly larger than AFR 205s but not too big to kill street manners. They are also like $600-700 cheaper. If your going to use it for the street then a huge head wouldnt do especially since your goals can be bet with a smaller head.
sunil6784
Member
my 331 made around 380 @ the wheels with the vic. jr's out of the box, with the vic. intake.
Now with my YSI it makes much more but that is a diff story
Now with my YSI it makes much more but that is a diff story
OHh yeah sorry it was not hyd. roller. I really couldn't even tell you b/c so much has been done since then.
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