lsthirdgen

Do I HAVE to change valley covers when I go carb or do people just do it to get rid of the knock sensors? thanks

snook

iTrader: (1)

I just cut the wire, left the sensors in there. My little black caps kept popping out when the motor was warm, had to grind a little off them and used some glue to get them to stay. I didnt like the look without the caps. A plate could be easily made, several post and pics on here of some.....

Prorac1

iTrader: (4)

Just remember if you have a newer block like an LY6 6.0 for example, That the valley cover has 8 orings that seal off the ports in the valley that would feed the displacement on demand in one of those motors.

lsthirdgen

thanks guys. i have an 01 or 02 4.8. i think ill just plug the holes and paint it, no one will notice lol!

ZONES89RS

iTrader: (25)

Many options, I made a plate before, the newer engines don't have them, they are on the sides of the block, but do not have a rear mount cam sensor.

Prorac1

iTrader: (4)

If you were to make a plate for the newer motors I would recomend tapping/ and plugging the 8 oil holes under the cover to seal them. But again, thats only for the newer DOD acceptable engines. Eric L

Cobra4B

iTrader: (9)

Since I was starting with a crate motor that didn't have any knock sensors installed to begin with I went with the Edelbrock plate.

ZONES89RS

iTrader: (25)

Do i want to know how much?

S10xGN

iTrader: (11)

Prolly not. I paid a guy $25 to TIG some scrap in my stock knock holes. A scrap piece of 1/4" plate would be cheaper but more time (labor) intensive...

Cobra4B

iTrader: (9)

If I had to do it over again I'd take the time to have some aluminum plate cut to fit. The Edelbrock plate is needlessly thick.

I had to "massage" my old-style LS1 coolant pipe to make it fit under the Performer RPM manifold. I'm suing the old-style pipe because the motor is going in a road race car and using all four steam ports is better than two.

pairof69s

i'm planning on getting some getting some aluminum sheered then machine turn it... maybe it'll give it some old school look

S10xGN

iTrader: (11)

For what (little) it does, 1/8" aluminum should be plenty. The thickness of the castings, factory or otherwise, may have to do with dampening valvetrain noise...

Slick68

iTrader: (7)

I made mine with 1/4" aluminum plate. The front and sides are staright, so a local metal fab shop sheared the straight edge then I traced the rear section and cut it with a jigsaw. Worked perfect.

Builtz71

iTrader: (4)

I just painted mine..unwired the knock sensors,and silicone the caps on..

Doug G

Thats all my plan is.