Woohooo getting a cam for my 5.3!!

[svensk]

.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.

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.

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.

There are lots of stealth cams that run high lift .600+ for scavenging.

 

[sand man]

.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.

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.

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.

There are lots of stealth cams that run high lift .600+ for scavenging.

yes almost every cheater cam has .600 of lift or more and can be used with factory exhaust and factory heads 241s wich flow less than the 243s

 

[sand man]

svensk how much oil your pan takes?
6 quarts? like mine or less?
other Q , can i reuse the ARP bolts or not, if not i dont wanna pay double the money for somthing i wont be really using

 

[svensk]

6 quarts, but I fill it to 7 quarts because the AWD tbss have oil starvation issues because the pickup is a the front of the pan. Even if I had a vette pan I would still run 7 quarts.
Yes, you can re-use ARP bolts a couple times.

 

[sand man]

6 quarts, but I fill it to 7 quarts because the AWD tbss have oil starvation issues because the pickup is a the front of the pan. Even if I had a vette pan I would still run 7 quarts.
Yes, you can re-use ARP bolts a couple times.

wouldent adding an extra quart effect the crank shiled

 

[Black02Silverado]

6 quarts, but I fill it to 7 quarts because the AWD tbss have oil starvation issues because the pickup is a the front of the pan. Even if I had a vette pan I would still run 7 quarts.
Yes, you can re-use ARP bolts a couple times.

wouldent adding an extra quart effect the crank shiled

It has been researched and found that 7qts is still a safe amount with no issues.

 

[sand man]

6 quarts, but I fill it to 7 quarts because the AWD tbss have oil starvation issues because the pickup is a the front of the pan. Even if I had a vette pan I would still run 7 quarts.
Yes, you can re-use ARP bolts a couple times.

wouldent adding an extra quart effect the crank shiled

It has been researched and found that 7qts is still a safe amount with no issues.

can i do that with mine?

 

[Texas1911]

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.

I beg to differ ... the amount of air volume you are pulling through the port is significantly higher than what those heads are supporting.

Most V8 tuners and owners are spoiled by large displacement. Displacement makes life easy, but it also makes your boundaries seem closer than they really are.

Whens the last time you saw a handbuilt stepped header running to a CNC designed collector and a 7.5 - 10 degree tapered pipe? or someone dynoing 2.0" to 3.5" collectors a 1/4" at a time?

To give you an idea, a header that Mike Kojima built for his Nissan SE-R project car produced about 30+ wtq. in the midrange over the industry standard header at the time. That's on a SR20DE (2.0L 4-Cyl) that produced about 197whp (no power adder).

 

[Texas1911]

other Q , can i reuse the ARP bolts or not, if not i dont wanna pay double the money for somthing i wont be really using

Reusing bolts depends on their torque value. If you've overtorqued them then they've likely plasticized and elongated. Pull them out and measure them to the millimeter for compliance.

Tightening in steps and to the correct value for the grade of stud / bolt is vital.

 

[sand man]

Thanks Alan

sorry for no updates but Texas speed didnt accepet my paypal and my cridet card so did pace performance so im wiretransfering the money it would take more time than expected