Not a bad cam. I don't believe your exhaust ports flow enough for 5° split. I run 6° (237°/243°) but my heads have been extensively ported and flow 300+ @ 0.650"

+300 @650 for exhaust? wow! Floteks flows, int 340cfm @650", exh 270cfm @650". I/E ratio is almost 80%.

It looks like the 290s drop off after .600 lift, what is the point in going with a .650 lift cam.

Flow numbers at flotek site are advertised too high. Check Eric Weingrtner video @ yuotube if yuo are interested. peak flow at 0.700" lift, untouched.

Review for stock 290cc

Modified 290cc

Why would you use those on a 509

if you believe flotech's flow charts,they flow really well.

I don't, but what are you comparing them to ? they still seem small for a 509 that may get a supercharger. There again, that's only my opinion.

Here is comparison of the valve timing events of all the cams i have mentioned in this thread. Looking only the duration, the Sporl perfomance cam looks most agressive, but because the wider 114lsa its lil milder than the crane 741.

From left to right in the picture.
-Custom 230/236,112lsa
-Comp 236/236,112lsa
-Sporl 240/245, 114lsa
-Crane 741. 236/244, 112lsa

What id it about the cam, that you are you calling it ‘milder’ ? The 114 vs 112 lsa ? Did you miss the rest of the #’ when comparing ?