My friend has a 95 ls and is pulling off his I M to polish the runners up and clean out the carbon build up I thought it just might be a waste of time.

 

Hot tank the thing and unless he is also sporting either a larger throttle body, or a ported head, then it's not really worth it. It would actually be quite easy to hurt power as polished runners help to swirl the air, and thus atomize the fuel better which contributes to making more power.

 

I'd love to know why he would have carbon buildup in his intake manifold.

 

it just happens ive seen the cleanest motors have some buildup... idk lol<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by arw321 &raquo;</TD></TR><TR><TD CLASS="quote">I'd love to know why he would have carbon buildup in his intake manifold.
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what else specifically would cause it?

 

are you talking about the oily black thing that comes from the pcv?

 

carbon and oil vented from the head mixes and forms a waxy coating in the IM

 

I think cleaning things are good. Now if he thinks he is gunna get like 10hp from just cleaning it out then he is stupid.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by thatbluecrx &raquo;</TD></TR><TR><TD CLASS="quote">
what else specifically would cause it?</TD></TR></TABLE>

Intake valve lash too tight. Causing the valves to be open a little when that cylinder is on its exhaust stroke.