As many of you know, I have an entire spare good running Series I L67 just laying around.

I am wondering what, if any gains / losses would there be in shipping the heads, LIM, */C, and exhaust manifolds out for some port / polish work.

I am open to any ideas here, and really don't have a clue if the benefits would be worth it, so any info would be great.

also, is there anyone on here that could do this kind of work? turnaround time would not be a problem as these are just spare parts, and my car would be up and running the whole time anyways.

also keep in mind that I am not looking to spend thousands here ( if that kind of work can even be had for less then thousands )

anyone have any ideas on this?

thanks

Heads would be a bit ahead of the game right now. You have to be flowing quite a bit more before that will do you much good.

I'd do the LIM and SC (all new bearings, too) first. Swapping those parts on will only cost you 2 hours considering the time and experience you have under the hood. You'll REALLY notice that.

Save the heads for when you do rockers and take care of your EM'*.

yea, the */C would for sure need a rebuild, the pulley has some play in it, bad coupler I believe.

any idea how much a P&P job on the LIM and */C would cost? aslo any idea on HP and TQ gains ( ballpark )?

I ran last year'* Zilla LIM and SC for about 500 miles, then pulled it off. I put it on the SLE about 2 months ago and it woke that up. I'd say 15-20hp from those two parts.

Head work? That'* tough. Nobody really specializes in S1 parts. I had to 'wing it' on my head porting. I did it all myself very carefully, including lapping the valves. I'd say you're in for a 200 dollar bill per head max. Half that minimum, but you'll need rockers, better exhaust, and a smaller pulley before then. Save the heads for the winter. DIY.

what about P&P on LIM and */C, is that a DIY type job, or something better left to someone that has done many before?

i'm watching this as well. have two spares of everything.

x2 on the watching.
and Geoff. you have enough parts to build two cars you mean.


I know not all the stuff is the same on the 94/95 as the 92/93. but im learning

After the basics (stat, intake, exhaust), the single most important change to a S1 of either Gen (91-93 or 94/95) is port-matching the LIM to the head port size. This is a factory induced restriction due to mass production.

Porting and polishing the SC will actually benefit the 91-93 Gen2'* more than the 94/95 Gen3'* because of the very rough outlet port of the Gen2 Eaton.

so, how hard is it to P&P the */C? If I can do this myself, I would be all over it

also, how would I go about port-matching the LIM to the heads? I want louder whine and more power ( don't we all )



also, I do realize that I probably would need other supporting mods or other mods first, but I am just looking at improvements on these parts for future reference.

For the porting and polishing of the SC, there are ample topics here already. I took my page down after a couple got butchered, but I've been bugged to put it back up, so I may do that again. Later today.

The SC and LIM porting don't need supporting mods. You're 'fixing' mass-production quality/casting issues.

The work is best done with a dremel for a first-timer so mistakes don't go too deep. Also keep in mind there is a 'preferred' intake. The very early L67 intakes were non-walled runners. That'* the LIM you want to start with.

http://www.bonnevilleclub.com/forum/...im+differences