Which Stock Head will work in a 2000 Ls1 ?

**TerribleTed** · 03-17-2010, 06:18 AM

Howdy,.,
So I either can remove my stock heads and fix the valve issues (which means do a total valve train rework on both heads) or purchase some new stock heads or aftermarket heads from dart or afr.
I have over 200 k on my motor and understand that if I put on heads that flow more, the pistons may wear real fast or blow due to the better flowing heads. Whats your opinion on this facet of data???

Also,,I found someone that has brand new heads PN 12558806 which show as a head that is for a Ls1 for model years 97-98. I own a 2000 which shows a casting number of 12559853. So I ask, would a stock ls1 head from a 97-98 year z28 fit in my stocker motor 2000 z-28. I would think they would fit, but figured I would ask in here...

I think I want to stay stock on the heads, since I truly just want to get my car going and drive it till the pistons are worn to shitt...then do a full engine removal and rebuild frm bottom to top.

So what shall I do, remove and rebuild my stock cylinder heads? Purchase some new heads for 800 bucks that are new and were intended for a 97-98 LS1? or buy some new dart or afr heads that flow more and spend 1600 bucks and hope my pistons wont blow to quickly,,,

I had making decisions,,so any help would be hot,,thanks all.,.

Ted

**PFM** · 03-17-2010, 06:28 AM

The 98 heads will fit your engine, but your valve covers and coil pack bracket will have to be change to the perimeter bolt pattern(97-98). Your best bet would be a set of 241s or 243s. I definately wouldn't spend big money on a 200k mile motor.

**Cutlass** · 03-17-2010, 06:54 PM

Your pistons won't blow up no matter what heads you choose. I think the best stock head is the LS6 head #243

**0rion** · 03-17-2010, 07:16 PM

you're going to have more headache than it's worth finding valve covers and coil pack brackets for the 98 heads. Not to mention they're the worst flowing heads of the bunch. I see 243 heads going for $400-$500 sometimes on the gto boards and they'd be a much better head to go with and will use all of your existing hardware. If you have plans for a new motor down the road just go for aftermarket heads unless you'll be going to a bigger bore. The larger bore blocks can use the L92's which is why I would hold out if you're going that way. If you're staying with an LS1 size bore though get some aftermarkets and just swap them over when you do the short block. Heads won't blow your current engine up but at 200k you have to already be on borrowed time I would think....even though these engines are extremely durable that's a lot of miles .

**TerribleTed** · 03-18-2010, 09:12 AM

Thanks for the data,,,I shall go with either some aftermarket heads that are built,,,or if at all possible when I remove my stock heads, do a full head parts replacement using stock parts for cost effective needs)..

Thanks all...

**garygnu65** · 03-18-2010, 12:56 PM

TSP had cnc #241 and cam for $1100.

**4get gto** · 03-18-2010, 03:58 PM

"""I have over 200 k on my motor and understand that if I put on heads that flow more, the pistons may wear real fast or blow due to the better flowing heads. Whats your opinion on this facet of data???
"""

I'd like to why the pistons will wear faster due to the new heads too ..?

Common sense tells me the new heads should out last the the old pistons.
Has nothing to do with the wear factor......IMO.