vitos on a ported engine?

['99350t]

i used to always run vitos pistons on my stock banshee and it ran great, now i've got them in plus a pretty heavy porting job, would this be whats giving me such a hard time getting this thing dialed in, because the port timing on the pistion is already changed? if so iam definatly going to wiseco pro-lite

[letsgetthisdone]

call the guy who did the port work, he should be able to give you a baseline.

[jbooker82]

If your talking about the pistons that have the notch taken out of the top of the piston to advance the timing of the exhaust port then dont run them. The guy that ported the cylinders has alread set the port timing. Chances are those pistons are over advancing the exhaust port timing.

[BellicoseBanshee]

If your talking about the pistons that have the notch taken out of the top of the piston to advance the timing of the exhaust port then don't run them. The guy that ported the cylinders has already set the port timing. Chances are those pistons are over advancing the exhaust port timing.

I concur.