vr4 upgrade done

[94gt-sn2000]

i had craig at paradise do my upgrade, and just got it back. I saw that u guys were talking about stock and billit impellers that came on the vr4, i put some pics in my info, can some one tell me if i have a good impeller or the stock one, and the limitations of each one. thanks

[speedytang]

That is a cast impeller and really no limitation since you will be under 50k rpm. Billit impellers have been gone for 10+ years.

[94gt-sn2000]

what do you mean under 50k rpm, is that the vr4 max limit? i have a 4.25" blower pully and i think 6.5" crank pully, but i'm putting a stoker (408) in my mustang and i wanted to push at least 8-10 psi out of it, what blower pully do you recomend and where can i get it? (its an 8 rib pully)
Also Looking for a blow off valve, and a power pipe for a 94-95 model, Any suggestions, thanks speedy

[speedytang]

The RPM limit of the VR4 for street use is 42k rpm and racing with cooler and short distance(Drag Racing) you can spin to 45k rpm. Your pulley size is a start but you will probably need a 3.75" supercharger pulley to feed a stroker that large. Not sure who makes a 4" Power Pipe for 94-95.

[94gt-sn2000]

thank for the info ill keep ya posted on the progress, and dyno numbers, looking for at least 550-600 rwhp