Yon2xx

Hello everyone,
I previously had a RCSB with a 4.8 and went with a chopacabra cam and that was purely for CHOP!. Welll long story short I have another truck (RCLB 4.8) and wanted to know if the Hawks Sinister cam is too crazy of a cam for a 4.8 it is a car cam (ls1) at the end of the day. Specs are 230/236 .600"/.600" 112+4 LSA. I plan on keeping the SBE, & hand porting & decking the heads.

Fullpower

If your gears are LOW enough, and your stall is HIGH enough, the short stroke mouse motor will be plenty happy.
My wild-as guesstimate says the 4.8 with 230/236 is crying for 4.56 gears and 3600+ stall

68Formula

If you plan on 11:1+ compression, 4.56 gears and 4500 stall, then sure go for it. Still pointless though unless you're running nitrous or boost. It's pretty proven that around 220* intake is max needed to squeeze all the power you'll get out of a 4.8L N/A. Basically you're just killing driveability and both low/midrange torque, with zero benefit in peak power.

For example, Summit's SUM-8720R1 218/227 .600/.600" 112+2 made same power as a whole host of much larger camshafts in a 4.8L. (Note: Ignore the title, all testing is without boost).

_zebra

iTrader: (5)

^^ echoing the above: will it run? sure. is it overkill? probably.

case-in-point: my builder, with concurrence from BTR, recommended a 231/248 cam for my little LS1 (originally speced for a high-effort 6.2). what saves its drivability in my car is its wide LSA (120°+5) maintaining compression... that and pushing 13psi through it.
even then, there was a marked decrease in sub-2500rpm torque (even in my little 3400lb car), but it carries through to 7000 now instead of falling off above 5500.

_zebra

iTrader: (5)

oh yeah... and you'll need to do dynamic compression calculations to see how much more static compression bump you'll need to maintain cylinder pressure.

going from stock 853s (10.1:1 SCR) & 2000 LS1 cam to the bump stick above with ported 243s (10.6:1 SCR), i've still got slightly lower cylinder pressure now despite pushing 2psi more boost.

IIGW

Big heavy trucks like 8psi from a turbo.

big heavy trucks dont like big cams.

_zebra

iTrader: (5)

a big cam is okay so long as you've got a loose converter & plenty of gear so that you start everything from a mid-range rpm.

smokinlmm

Or instant boost from a supercharger.