LB7: What cam would be the best for 2.6 SB pulling truck using Allison trans?

[Micheal Tomac]

New motor build using some stuff from the old motor. This is what I have so far. I’ll hung up on what cam to use & AF or not.

New LML block o-ringed - 4.1 bore with billet main caps
Mahle Forged aluminum pistons - 17.5:1 compression ratio
Billet SoCal narrow rod journal crank
Narrowed Crower rods
SoCal stage 2 heads
Wagler street intake
100 over Exergy injectors
Dual cp3’s

 

[Chevy1925]

0 need for an AF cam with that crank.

Cam would depend on turbo/s and rpm range you want to run.

 

[SmokeShow]

I'd think a bit more fuel too? Who does your tuning?

 

[Micheal Tomac]

2.6 smooth bore turbo T4 pedestal

Probably 4500 rpm max with LB7 ecm & FICM

 

[Micheal Tomac]

I know I should have 200-250 over injectors but I already have the 100 overs and this build is already $$$

I tune it.

 

[S Phinney]

Consider your stall Convertor in that scenario as well. Will it be dedicated pulling truck or multi use? If multi use stay away from high overlap cams. Something in the 195-200 at .050 and 475-500 lift would be good if multi use. Maybe increase duration 10-15 degrees if you just looking for higher rpm power.


Sent from my iPhone using Tapatalk

 

[Bdsankey]

IIRC SoCal staid a bunch of their 2.5/2.6 pullers are running the 6480 cam. I know it performed very well when I tried out a 2.5 map charger and it was a pretty good pairing with the injector/converter combo I was running (250% and Goerend J).

 

[Micheal Tomac]

It’s a pulling truck. I’ve been running the SoCal 6480 std fire with a 2.5 map turbo but I was curious if there was a better option.

 

[S Phinney]

I think you would be happy with the 8410 version. They don’t advertise it but they made it for me. That cam made good power to 4100 area. It spoils great as well. I have ran their 9100 before and believe that cam is better than the 9100. 9100 has a lot of overlap and is made for mostly high rpm power. I usually look for power under the curve not peak power. That makes it a more usable cam.


Sent from my iPhone using Tapatalk

 

[lawnboy01]

0 need for an AF cam with that crank.

I wouldn’t hang my hat on af cams at all. At least 2 broke cranks in the 3.0 LPDT class this season. Both billet cranks. It’s a Duramax thing.....

 

[Chevy1925]

I wouldn’t hang my hat on af cams at all. At least 2 broke cranks in the 3.0 LPDT class this season. Both billet cranks. It’s a Duramax thing.....

Narrow rod journal or just billet?

 

[lawnboy01]

Narrow. No junk stuff. Top shelf trucks

 

[rcr1978]

Dammit :baby: Sure was hoping the narrowed journal deal was going to be promising

 

[ZeroGravity58]

Dammit :baby: Sure was hoping the narrowed journal deal was going to be promising

99% of people aren't going to be pushing their motors as hard as those guys.

 

[S Phinney]

Narrow. No junk stuff. Top shelf trucks

I’m guessing this was a Callie’s crank


Sent from my iPhone using Tapatalk

 

[Chevy1925]

I’m guessing this was a Callie’s crank


Sent from my iPhone using Tapatalk

that was my next question as Socal's is far narrower

 

[S Phinney]

that was my next question as Socal's is far narrower

I don’t see that Bryant crank breaking but I guess anything is possible.


Sent from my iPhone using Tapatalk

 

[Chevy1925]

I don’t see that Bryant crank breaking but I guess anything is possible.


Sent from my iPhone using Tapatalk

if they are, i would be VERY curious on block setup, rpm, internal weight, and so on. doubt we would see that info but we could hope :roflmao:

 

[WolfLMM]

SoCal crank has much much much more material. I personally haven’t heard of one breaking. I guess anything is possible though.

 

[lawnboy01]

I’m guessing this was a Callie’s crank


Sent from my iPhone using Tapatalk

Keep guessing. I said no cheap junk