.607" is a pretty tall lift value ... you going to do anything to the heads down the road? Otherwise I'm not sure why they are going for that much lift.
Woohooo getting a cam for my 5.3!!
- Thread starter sand man
- Start date
sand man
going to reach 130F..so i practically live there.
Be sure to get some good before and after vid's of your exhaust.
Would like to hear the difference. From what you currently have it sounds like its loud
yes sir will do
This will be a fun thread
[YT]p_v9RUE2nrw[/YT]
Hell yeah, you dun yet?
will see how this turns out
yes , 63k miles, dont want a GM replacement, and im doing most of the work 80% of the pump swap and i dont want to do/pay for parts and labor twice.
yes, cusine has the same 100296 pump at 650 idel speed the gauge is 2/3 compared to a littel under 1/2
he said this would help with the low end . the 243 heads start drop the flow numbers just after the .580 of lift as i recal reading
but what do i know compared to Pat G
sand man
going to reach 130F..so i practically live there.
Stock Head Flow Numbers
Chamber 64.45 cc-------0.100---0.200--0.300--0.400---0.500---0.550---0.600
Intake 210 cc------------62------126----184----224-----251----256----257
Exhaust 75 cc------------57------108----143----163-----176----180----183
thats for LS6 the 5.3 has a littel lower numbers and they drop at .600 of lift
Chamber 64.45 cc-------0.100---0.200--0.300--0.400---0.500---0.550---0.600
Intake 210 cc------------62------126----184----224-----251----256----257
Exhaust 75 cc------------57------108----143----163-----176----180----183
thats for LS6 the 5.3 has a littel lower numbers and they drop at .600 of lift
svensk
TMC's official Zombie Slayer
His 243 heads are the same as I have. They flow more than the 5.3 can push N/A. His lift is pushing it, but his duration, displacement and compression are all pretty mild yet.
LMSeven
Μολών λαβέ
Looks like a healthy cam.
sand man
going to reach 130F..so i practically live there.
i have a ported TB will that help
do you guys recomend a mill? if u do i might change the prods to 7.400
do you guys recomend a mill? if u do i might change the prods to 7.400
LMSeven
Μολών λαβέ
If the heads are going to be off...
Ask Pat G first.
Ask Pat G first.
Yeah, my point is that a .600"+ lift is a bit excessive for that profile and head. If it's not going to do much for the setup then there's no use in the extra lift adding exponential amounts of seat pressure and spring bind.
It's hard to say that it won't do anything though, if you can accelerate the valve quickly then it will pull negative pressure at the port. Just have to have enough spring bind to soak up the inertia and keep it from bouncing at higher RPM.
Another way is to run excessive lift so that you can slow the valve down on the way back and hold it open a tad longer on the overrun for scavenging. Since lower RPM is where you get the most charge dilution, it kinda looks like that's the motivation here. Until you get the valve past 0.050" you're essentially choked at the port.
i have a ported TB will that help
do you guys recomend a mill? if u do i might change the prods to 7.400
Milling the heads is pretty lackluster.
You're increasing the quench area and changing quench clearance. That can cause localized pre-ignition and then detonation (dieseling essentially).
It's not worth the .2 in compression ratio you'd gain. Especially when you consider you're cracking the OEM seal to do it.
This is Awsome news Faisal! 
