stupid question about stock heads
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Instructor
Joined: Jan 2008
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From: San Carlos CA
stupid question about stock heads
OK, I see someone advertising several different LS1 heads for sale. 241? 893? I see that the earlier C5's had 893 heads and they have "center bolts" as opposed to the "side bolts" on the 241's. My question is, can I take the heads off a late model LS1 and put them on an early LS1? Or will the bolt holes be in the wrong place? 
Melting Slicks
Joined: Aug 2000
Posts: 2,618
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From: Overland Park KS
The heads are interchangeable. HOWEVER, the different valve covers (center bolt vs. perimeter bolt) also use a different coil pack mounting method. The perimeter bolt valve covers have each coil pack mounted directly to the valve cover. The center bolt valve covers use a bracket all the coil packs mount into and then that bracket is bolted onto the valve cover.
I'm not sure if the coil pack styles changed (could have) which would also mean your current coil packs probably would not mount the other way. I have read if you have the 853 casting ported it flows the same as the 241 heads. If it were me, I would go LS6 ported or aftermarket. Heads are expensive enough, don't do something you think you might redo later!!
I'm not sure if the coil pack styles changed (could have) which would also mean your current coil packs probably would not mount the other way. I have read if you have the 853 casting ported it flows the same as the 241 heads. If it were me, I would go LS6 ported or aftermarket. Heads are expensive enough, don't do something you think you might redo later!!
Race Director
Joined: Oct 2002
Posts: 16,477
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From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
The 97-98 perimeter bolt heads were casting #806.
99-00 LS1's used 853 heads. These were of the centerbolt stule.
01-04 LS1s used 241 centerbolt heads.
01-04 Z06 LS6 used 243 heads.
As stated above, as far as bolting to the engine, all are interchangeable. To convert from perimeter to centerbolt heads, you will need to get centerbolt valve covers and coil pack brackets.
99-00 LS1's used 853 heads. These were of the centerbolt stule.
01-04 LS1s used 241 centerbolt heads.
01-04 Z06 LS6 used 243 heads.
As stated above, as far as bolting to the engine, all are interchangeable. To convert from perimeter to centerbolt heads, you will need to get centerbolt valve covers and coil pack brackets.
Race Director
Joined: Apr 2005
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From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
The heads are interchangeable. HOWEVER, the different valve covers (center bolt vs. perimeter bolt) also use a different coil pack mounting method. The perimeter bolt valve covers have each coil pack mounted directly to the valve cover. The center bolt valve covers use a bracket all the coil packs mount into and then that bracket is bolted onto the valve cover.
I'm not sure if the coil pack styles changed (could have) which would also mean your current coil packs probably would not mount the other way. I have read if you have the 853 casting ported it flows the same as the 241 heads. If it were me, I would go LS6 ported or aftermarket. Heads are expensive enough, don't do something you think you might redo later!!
I'm not sure if the coil pack styles changed (could have) which would also mean your current coil packs probably would not mount the other way. I have read if you have the 853 casting ported it flows the same as the 241 heads. If it were me, I would go LS6 ported or aftermarket. Heads are expensive enough, don't do something you think you might redo later!!
Racer
Joined: Nov 2008
Posts: 316
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From: Leesburg GA
