Quote:
Originally Posted by jwcarguy
You didn't mention how you are going to use this engine/
But from asking "is this cam streetable" leads me to think that it will mainly be a street car with some track days? correct?
Auto or manual trans?
rearend gear ratio?
If so, also have to know if you Diamond pistons have valve reliefs, how much your heads have been milled, head gasket thickness and are you still running the stock 1.7 ratio rockers??
With that much duration (@ .050), you need to beware of what you ptv clearance is (piston to valve)
With the fist cam choice you have approx 13 degrees of overlap, which is high for a LS3 cylinder head (the intake valves are 2.165" compared to the exhaust valve at 1.59") that is why on these rectangle port heads, most cam recommendations have much more duration on the exhaust side to compensate for the size difference for proper exhaust gas flow
For my engine (LS2 6.0L w/ LS3 cylinder heads stock unmilled and intake setup) I contacted both "Pat G" @ Guerra Motorsports and "Spinmonster" from the Corvette world, both are some of the top LS EFI tuners in the country
Both of them explained about having too much overlap effects low end and driveability
here is a interesting read on the LS3 heads and cam specs vs performance/ driveability:
http://forums.corvetteforum.com/c6-t...-camshaft.html
My cam was custom ground by EPS:
226/234 .629”/.629” 113 LSA +2 advance (with 1.7 ratio rockers)
EPS ET/ET lobes on 8620 steel 3 bolt cam core
EPS26-2/EPS34-2 HR113 LSA +2 advance (111 installed intake centerline)
hope this helps,
Jeff |
Thanks Jeff, the pistons have valve reliefs and rockers are 1.7.The car will see some track time but street and highway too. Tremec 6-spd, 12 bolt with 373 gears. The engine was built for a gal who was putting it in an RX7 but she had to sell it before it was installed. I can change the cam out its stll not in car and has no intake on it, easy fix but I have to pick a cam out.
Kevin
