which heads? L92s or stage 2 243s???
02-15-2011, 04:27 PM
#11
OP, the L92 will not clear (piston to valve) with either of those camshaft and the L92 heads. I'd go with the PRC Stage 1 LS6 heads and the MS4 if you are wanting that big of a camshaft. We can set them up to clear perfectly, and have a nice tax time special going right now!
02-15-2011, 08:11 PM
#12
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No sirs, it's basically the same as an LS2 at that point which is right at 10.9:1 static compression.
OP, the L92 will not clear (piston to valve) with either of those camshaft and the L92 heads. I'd go with the PRC Stage 1 LS6 heads and the MS4 if you are wanting that big of a camshaft. We can set them up to clear perfectly, and have a nice tax time special going right now!
OP, the L92 will not clear (piston to valve) with either of those camshaft and the L92 heads. I'd go with the PRC Stage 1 LS6 heads and the MS4 if you are wanting that big of a camshaft. We can set them up to clear perfectly, and have a nice tax time special going right now!
02-15-2011, 08:35 PM
#13
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L92/Ls3 heads are about half the price of stage 1 or 2 heads and will still net you great results, And I bet you could get away with the Trex cam, Just try and keep your lift around .62x and lower. Few setups like that around here and no PTV issues....
02-16-2011, 01:15 PM
#17
It's the low lift duration numbers (and a little duration at .050") that determine how fast or slow the valves comes off the seat. The more aggressive lobes that have more duration at .006" (with the same duration at .050") will be making that valve open and close at a faster rate (ramp rate). If you think about it, the contact will always occur just a handful of degrees before and after TDC, when the valves are just opening and closing.
02-16-2011, 01:23 PM
#18
Also advancing the cam decreases intake PTV clearance as well as running a tighter LSA. The large 2.160 intake valve on LS3/L92 heads is the reason for less intake duration allowed on a piston that isn't fly cut or setup with valve reliefs to clear for the large intake valves.
