Heard your cam video and I did some calculations based on David Vizard's teachings. You've definitely got the right LSA for this combo, but your centerline is a tad off(you 104 vs Vizard teachings saying 108). Could be adjusted by cam timing change, though. Obviously, duration determines overlap, which is up to your preference for how high you want to rev it, so that's fine. 69 degrees of overlap at advertised duration sounds nice, I like it. Technically, your intake valve is big enough to take advantage of .520 to .624 lift, but IDK the limits of flat tappets or your piston-to-valve clearance. Or really, even your head flow numbers at high lift. Nonetheless, you certainly have a better setup than everybody out there with wide LSA cams and just random junk thrown together, so great job!
I appreciate the comment! I had a specific rpm range in mind when I selected the cam based on the rest of the combo and it ran well but certainly could've been better. I sold the car a couple years ago, but if I had to do it again I would select a cam (or have a custom grind done) with a little less intake duration to get the vacuum up for the brakes. The Windsor head really needs a split duration cam for the best performance in my opinion but it would be interesting to see what a 104 LSA would've done versus the 108.
@@srm351 No, your 108lsa was fine, the 104 centerline (which I assume is where the intake valve center is determined when the cam is at 0-deg adv or ret inside the block) is where I was saying David Vizard's specs would differ. But the upside is that you could just adv or ret the cam itself to simulate a 108 centerline with 108 LSA instead of the 104 centerline with 108 LSA. For the intake valve size of those trick flows combined with it being 351ci, 108 LSA at 10-10.5 compression is dead on. I'm considering a SBF build for myself to put in my 09 Ranger, any tips? Do you know which shelf heads flow the best at low lift and have the smallest combustion chambers, but with bigger valves than stock? I don't need monster valves but 2" and 1.6" or thereabouts like an LS would be nice.
Heard your cam video and I did some calculations based on David Vizard's teachings. You've definitely got the right LSA for this combo, but your centerline is a tad off(you 104 vs Vizard teachings saying 108). Could be adjusted by cam timing change, though. Obviously, duration determines overlap, which is up to your preference for how high you want to rev it, so that's fine.
69 degrees of overlap at advertised duration sounds nice, I like it. Technically, your intake valve is big enough to take advantage of .520 to .624 lift, but IDK the limits of flat tappets or your piston-to-valve clearance. Or really, even your head flow numbers at high lift. Nonetheless, you certainly have a better setup than everybody out there with wide LSA cams and just random junk thrown together, so great job!
I appreciate the comment! I had a specific rpm range in mind when I selected the cam based on the rest of the combo and it ran well but certainly could've been better. I sold the car a couple years ago, but if I had to do it again I would select a cam (or have a custom grind done) with a little less intake duration to get the vacuum up for the brakes. The Windsor head really needs a split duration cam for the best performance in my opinion but it would be interesting to see what a 104 LSA would've done versus the 108.
@@srm351 No, your 108lsa was fine, the 104 centerline (which I assume is where the intake valve center is determined when the cam is at 0-deg adv or ret inside the block) is where I was saying David Vizard's specs would differ. But the upside is that you could just adv or ret the cam itself to simulate a 108 centerline with 108 LSA instead of the 104 centerline with 108 LSA.
For the intake valve size of those trick flows combined with it being 351ci, 108 LSA at 10-10.5 compression is dead on.
I'm considering a SBF build for myself to put in my 09 Ranger, any tips? Do you know which shelf heads flow the best at low lift and have the smallest combustion chambers, but with bigger valves than stock? I don't need monster valves but 2" and 1.6" or thereabouts like an LS would be nice.