806 head question (searched)
05-15-2007, 08:23 PM
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806 head question (searched) I have a '98 LS1. Ohh its so terrible and all that. Anyways, moving on...
I have an extra pair of 806 heads that I am planning to have a bit of porting/polishing done on by a local head guy.
I don't really want to upgrade to center bolt heads, 243's, whatever, so lets leave that alone please.
The question I have is this... I have read that the valves in 806 heads are bad and that I should replace them with a later model LS1 intake valve and a truck head exhaust valve. Can I please get some more info on this?? I have searched around as much as the site will let me and haven't come up with much.
Thanks!
I have an extra pair of 806 heads that I am planning to have a bit of porting/polishing done on by a local head guy.
I don't really want to upgrade to center bolt heads, 243's, whatever, so lets leave that alone please.
The question I have is this... I have read that the valves in 806 heads are bad and that I should replace them with a later model LS1 intake valve and a truck head exhaust valve. Can I please get some more info on this?? I have searched around as much as the site will let me and haven't come up with much.
Thanks!
05-16-2007, 03:32 AM
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The intakes are the same as the newer ones, close enough if theres really a difference. The exhaust valve on the other hand needs to be swapped out to the newer tullip style valves like the later cars and truck heads have.
05-16-2007, 10:18 AM
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I agree with Bo, and also once the 98 head is ported it is very compariable to a 99+ LS1 head. Still lacking vs a 243 head which is a LS6/LS2 head.
The LS1 heads are typicially 806 in 97/98 Vette and 98 F body, 853 in the 99-2000 years, and 241 in the 2001/2002 years. In 03/04 Vette and 04 GTO the 241 stayed in place. Once 05 came around the 241's were gone and taken over by the 243's. I believe even the monte carlo SS, Grand Prix GXP etc even use the 243 casting heads.
The LS1 heads are typicially 806 in 97/98 Vette and 98 F body, 853 in the 99-2000 years, and 241 in the 2001/2002 years. In 03/04 Vette and 04 GTO the 241 stayed in place. Once 05 came around the 241's were gone and taken over by the 243's. I believe even the monte carlo SS, Grand Prix GXP etc even use the 243 casting heads.
05-16-2007, 02:50 PM
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Once they are ported there will be NO difference between your '98 heads and a set of '04 SPM LS1 heads.
If I were you, I'd have them cut for bigger valves on both sides. 2.02/2.04 on the intake and a 1.57" on the exhaust. If your local guy is any good, they have just as much potential as any 5.3L or LS1 head.
Ben T.
If I were you, I'd have them cut for bigger valves on both sides. 2.02/2.04 on the intake and a 1.57" on the exhaust. If your local guy is any good, they have just as much potential as any 5.3L or LS1 head.
Ben T.
