22lambo

iTrader: (1)

I have a set of 862 heads that have a lot of carbon build up and other crap and I was thinking of giving it good polish to get rid of it and the casting marks. I don't want to take any material away in terms of porting, just smooth out all the surfaces. Would there be any gain to that vs leaving it alone? Just wondering

WS.SIX

iTrader: (3)

Knocking any high casting marks off will give a negligible gain. "Polishing" in its actual sense is bad for basically everything except the exhaust port. In the exhaust port it helps with carbon buildup. In the intake port you'll hurt your fuel atomization. In the combustion chamber if bad enough you'll hurt your compression and chamber dynamics.

HCI2000SS

iTrader: (2)

I have the 862 heads that have been ported and polished by Texas Speed. From my understanding these particular heads don't offer much at all unless ported

thunderstruck507

iTrader: (18)

it will be a lot of time and work for little gain IMO

redtan

iTrader: (5)

You don't want to polish your intake runner to a mirror like finish. That doesn't help with atomization of the air/fuel mixture. You want some sort of rough finish for that to happen properly, which is why you see all the porting jobs having "layers" in order to give it that rough feel.

The exhaust port yes you can polish the heck out of it and should help a little big, but not the intake side. Either port it or leave it stock.

22lambo

iTrader: (1)

Thanks guys for the advice. I will most likely clean up the intake and polish the exhaust

wildcamaro

iTrader: (15)

Yea that's what I did was clean up slag and carbon and polish exhaust ports on my heads...