Did you pick up a cam yet? I have an ls2 cam which is nearly identical to the ls3. Pm me if you're interested.

Also have a new GM valley pan gasket that I'm not going to use if you're interested

 

Kinda late but all gmt 900 oil pans have the relief valve in em. Even the 4.8 trucks without dod/vvt. If you have a 4l60 your going to want a small torque biased cam or gears. Gears make a world of difference. Remember youve got a yukon attached to that motor lol.

 

Nt overly worried about excesive amounts of performance... If i could get a stock cam with exact same specs as the non dod lobes of the cam id be happy... Goal is dod delete not really performance.... If i do anything overly complicated to this its gonna involve a 6l80....

Not overly pressed about relief valve at this point.... Point of it ive found is to keep the pan from being sucked dry, under hard acceleration...

 

What are the stock spec's on the non dod cam?

I have a stock gen3 4.8/5.3 cam.

 

Wanna say lift on it is like .479..... Looked like 4 cams up earlier today and for some reason remember the LMG having as much lift as the L77 out of a caprice ppv

 

HMMM.......


Corvette LS1
97-98 12554710 199/207 .472/.479 117
98-99 12560964 199/207 .472/.479 117
2000 12560968 198/209 .500/.500 115.5
01-03 12561721 198/207 .467/.479 116

Corvette LS6
2001 12560950 204/211 .525/.525 116 385hp
02-04 12565308 204/218 .555/.551 117.5 405hp

Camaro/Firebird
98 12557812 198/209 .500/.500 119.5
99-00 12560965 198/209 .500/.500 119.5
01-02 12561721 196/207 .467/.479 116

Trucks and SUV with Vortec engine
LR4 and LM7
99 12560966 191/190 .457/.466 115.5
00-04 12560967 191/190 .457/.466 114
the 03-04 LM7 used the 12560967 camshaft

LQ4
99-00 12560967 191/190 .457/.466 114
01-04 12561721 196/207 .467/.479 116
01-04 LQ4 cam is same as Camaro, Corvette LS1 and LQ9 cam

LQ9
02-03 12561721 196/207 .467/.470 116

 

I would have to look to verify, but I believe this is what I have.

12560967 191/190 .457/.466 114

 

Not sure what the duration and lsa are on the dod cams, but if my math is right the non dod lobes are .481 intake and exhaust and the dod lobes are .490... .283/.289 according to specs.... again no idea what the duration and lsa are on them

 

L77 has less lift but being a revtangular port head id assume larger split on duration and maybe less lsa??

 

Ok a 4.8 cam out of a newer L20 is same lobe lift specs as the non dod, but designed for vvt... Would it work without vvt??