head questions please help

[turbot96]

im rebuilding a head for my 420a talon i found crower cams and springs/ and caps. im looking at the stage 2 crower cams do i need to do any tuning... like ecu repro or fuel inj. or should i just go with the stage 1 cam?
im also porting and polishing the head if, and also considering changing to a 5 angle valve setup, will i need to tune also if i do this. im not planing on having ecu work or fuel so will any of this make me change fuel load or anything in that line? thankyou

 

[david-b]

Stage 2 is fine with no tuning. I run the same with Crane springs/retinaers and I'm n/t still. Stage 1's are good also... it all depends on your hp goals. Idle on 2s is a little rougher too.

You don't "change" to a 5-angle valve setup. It just allows the valve to sit better flushed with the head and allow for smoother enter/exit of air flow. On a N/T there's really no need for a 5-angle.

All of this you can do with no upgrades to the fuel system or ECU. I run a SAFC to lean out because of the cams, but that's all.

 

[Defiant]

(There's more reason for smoother valve tracts on N/T motors than there is on forced induction.)

 

[Ichibahn SLC]

hey david-b
i have a 420a motor that im thinking of doing a build on
how did those cams work out for you power wise
did you notice a difference