862 vs 243 vs L92 for 5.3
08-08-2009, 01:10 AM
#1
862 vs 243 vs L92 for 5.3
I've been thinking about all the work I want to do to the 862s I bought, and the price is starting to get up there. I've heard that one of our sponsors sells L92 heads for $700 which got me thinking of other options.
862 option: Mill them .030, CNC porting, 5 angle valve job, maybe stainless valves. ($900-1000)
243 option: Mill to raise compression ($600-700)
L92 option: Mill to raise compression, 90mm intake setup ($1200+)
I know the L92 setup would be the most costly because of the change in intake manifolds, but I know they flow incredibly well. These heads will be going on a 5.3 with a 228/228 .588 .588 112 cam, which really needs a good set of heads to really make power. Would the worked over 862s be worth it, or would spending the extra money on 243s be better than wasting money on the 862s and all the work needed to make them flow better.
And yet another question. I am revving my motor to 6600-6700 with this cam. If I put a good set of heads on there, should I swap to a different intake manifold? I know the truck manifold falls off pretty bad up top.
862 option: Mill them .030, CNC porting, 5 angle valve job, maybe stainless valves. ($900-1000)
243 option: Mill to raise compression ($600-700)
L92 option: Mill to raise compression, 90mm intake setup ($1200+)
I know the L92 setup would be the most costly because of the change in intake manifolds, but I know they flow incredibly well. These heads will be going on a 5.3 with a 228/228 .588 .588 112 cam, which really needs a good set of heads to really make power. Would the worked over 862s be worth it, or would spending the extra money on 243s be better than wasting money on the 862s and all the work needed to make them flow better.
And yet another question. I am revving my motor to 6600-6700 with this cam. If I put a good set of heads on there, should I swap to a different intake manifold? I know the truck manifold falls off pretty bad up top.
08-08-2009, 01:32 AM
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08-08-2009, 12:46 PM
#8
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I have an 07 nnbs with 243's. Not sure of the difference, but I'd do the L-92's if you can swing the 6.0 block.
A 6.0, L-92's, and a stiff cam can get you in trouble quick. I hear you can get 475 RWHP smog legal here in Socal easy with that combo, but since you live near the big D. You can get way more since Texas smog standards are apparantly none existant.
A 6.0, L-92's, and a stiff cam can get you in trouble quick. I hear you can get 475 RWHP smog legal here in Socal easy with that combo, but since you live near the big D. You can get way more since Texas smog standards are apparantly none existant.
08-08-2009, 12:51 PM
#9
I have an 07 nnbs with 243's. Not sure of the difference, but I'd do the L-92's if you can swing the 6.0 block.
A 6.0, L-92's, and a stiff cam can get you in trouble quick. I hear you can get 475 RWHP smog legal here in Socal easy with that combo, but since you live near the big D. You can get way more since Texas smog standards are apparantly none existant.
A 6.0, L-92's, and a stiff cam can get you in trouble quick. I hear you can get 475 RWHP smog legal here in Socal easy with that combo, but since you live near the big D. You can get way more since Texas smog standards are apparantly none existant.
