I have all stock internals. (stock intake,stock heads, stock cam, stock pistons).

What RPMS do you guys with stock internals usually shift at???

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 polished kit, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL (5200rpm limit),Holley 9mm wires,Ac delco R43ts plugs,stock chip,Ford SVO 24# injectors,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

i would shift it at a max 5500-6000
rpm.because u might risk floating a valve at any higher rev.its even worse with boost.
i shift my n/a 305 tpi at 5000 and run 15.2 i tried shifting it higher i barely gained anything to be worth it.
dave

 

If you want to keep that SN92together you better be shifting before 5000 RPM.

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Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

My IROC-Z
EFI Performance Club on Yahoo
Club IROC-Z

 

I had the same combo and I shifted at 5000 rpms. I tried to go higher but I did not gain anything. I was running 7lbs. of boost.