Which heads on a 2000?
08-12-2010, 05:22 PM
#1
Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
Which heads on a 2000?
I have read in several other forums that the 97-00 Corvettes came with 853 heads and that the 241 castings were on 01 and after LS1's. Is this fact, and so my 2000 has the 853 casting? What are the primary differences between the 853 casting and the 241 (flow rates, port/valve sizes???). Thanks.
08-12-2010, 06:14 PM
#2
Burning Brakes
For what it's worth, there is "no difference" between the 853s and the 241s. Your '00 has 853s. the number is stamed near the bottom corner of the valvecover if you'd like to make sure.
It's upside down here, but @ the far left you can see "853" :
It's upside down here, but @ the far left you can see "853" :
08-13-2010, 12:38 AM
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Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
Ok....
Thanks guys. Plan on either LS6/243's or aftermarket heads at some point, just wanted to know if the 241's were an upgrade to the 853's.
08-13-2010, 11:08 AM
#6
08-13-2010, 11:29 AM
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Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
08-13-2010, 02:35 PM
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08-13-2010, 04:27 PM
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The best heads are AFR 205s for most applications...
835. I see it too.
And the difference between 853 heads and 241 is the casting method. The semi-permanent molds on the 241/243s were a bit more uniform than the sandcasted early heads and it's been said in a couple magazine articles a few years back to have a 4-7 rwhp difference because of it.... even though the specs are similar.
The deal with the (stock) 243s are the minor port changes and higher compression... although once ported 241s and 243s are very similar if the CC and others specs are kept identical to each other.
And the difference between 853 heads and 241 is the casting method. The semi-permanent molds on the 241/243s were a bit more uniform than the sandcasted early heads and it's been said in a couple magazine articles a few years back to have a 4-7 rwhp difference because of it.... even though the specs are similar.
The deal with the (stock) 243s are the minor port changes and higher compression... although once ported 241s and 243s are very similar if the CC and others specs are kept identical to each other.
08-13-2010, 07:39 PM
#12
Melting Slicks
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St. Jude Donor '10
Those are 035 castings, which are 6.0l LQ9 truck heads. (equivalent to 317 castings). Never came stock on any LS1 or C5.
There is no such thing as an 835 casting, plus the D-shaped exhaust port of those pictured give them away as a large-runner factory head. (which narrows it down to a 243, 799, 317, or 035 casting).
The 6.0 heads are basically just large chamber (71cc) versions of the LS6 heads, many choose to use them on FI LS1 applications where lowering compression can be beneficial.
08-13-2010, 09:09 PM
#13
Le Mans Master
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St. Jude Donor '08-'09
Those are 035 castings, which are 6.0l LQ9 truck heads. (equivalent to 317 castings). Never came stock on any LS1 or C5.
There is no such thing as an 835 casting, plus the D-shaped exhaust port of those pictured give them away as a large-runner factory head. (which narrows it down to a 243, 799, 317, or 035 casting).
The 6.0 heads are basically just large chamber (71cc) versions of the LS6 heads, many choose to use them on FI LS1 applications where lowering compression can be beneficial.
I've seen that bit of wisdom somewhere else before. Things you can learn in a Barn huh. 
08-13-2010, 09:28 PM
#14
ISIS SUCKS FAT CHOAD
You could get 425 at the tire by porting your 853's and adding larger valves with the other supporting mods you listed. Thats a very easy and obtainable power level. in the end it would probably be cheaper then porting 243 heads too once you factor in the cost of a core. unless you already have a set of 243 heads.
08-14-2010, 12:15 AM
#16
Melting Slicks
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
You could get 425 at the tire by porting your 853's and adding larger valves with the other supporting mods you listed. Thats a very easy and obtainable power level. in the end it would probably be cheaper then porting 243 heads too once you factor in the cost of a core. unless you already have a set of 243 heads.
08-14-2010, 01:11 AM
#17
ISIS SUCKS FAT CHOAD
I dont have a set of 243's, but have seen ported and upgraded 241's (used) for about $800 for the pair. That included upgraded valves, springs, rockers, retainers etc. Given the price of getting and then porting/upgrading a set of 243's may be close if not more than double that price I may go the 241 route or port and upgrade the 853's on the engine now.
