862 vs 243 vs L92 for 5.3
08-08-2009, 01:00 PM
#11
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243's w/ a good valve job & a 90mm TBSS intake manifold will work nice. The key will be setting up your valve train properly. Do that & you'll make good power every where.
08-08-2009, 01:02 PM
#12
That was my next question. Should I go with the older cathedral port 243s or the newer oval port 243s (799s) like on the new 5.3s?
If it's not that big of a difference I'm not sure I'd like to spend the money on swapping intakes.
If it's not that big of a difference I'm not sure I'd like to spend the money on swapping intakes.
08-08-2009, 03:01 PM
#15
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To be honest it aint worth the swap unless u also port/polish the 243's...
best thing to do is save a little more for a 6.0 swap, since u can find some decent low mileags for $1200-1400
best thing to do is save a little more for a 6.0 swap, since u can find some decent low mileags for $1200-1400
08-08-2009, 06:10 PM
#16
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I would do the 862's. They will cost a bit more and give you better results. Milling the 243's will get you down to about stock compression. Milling the 862's can get you to 10:1 or higher and they flow very well ported. Compression is one thing the 5.3L really needs. We did a 5.7L a while back with ported 5.3L heads and made 451RWHP. We took 243's off to put them on.
08-08-2009, 09:18 PM
#19
I would do the 862's. They will cost a bit more and give you better results. Milling the 243's will get you down to about stock compression. Milling the 862's can get you to 10:1 or higher and they flow very well ported. Compression is one thing the 5.3L really needs. We did a 5.7L a while back with ported 5.3L heads and made 451RWHP. We took 243's off to put them on.