I have a single pattern Cam 226/226 .585/.585 112*LSA. I was wondering about some info on a dual pattern cam 225/229 .580/.590 114+4 LSA The heads have 2.02 intake valves 1.57 exhaust valves with dual springs. I know it will help breathing on the exhaust side. What would happen to the power band and the idle.

 

I dont think you would see much of change at all with that cam swap, in driveability or idle. Its bigger, but has a wider LSA wich cals the idle back down.

I would think about going to a better lobe design. Like the LSL lobes from COmp, its what I run(and most of the guys on LS1tech, Im not sure if its caught on here yet).

They have 223/231, 227/235, both with .604-.617 lift. Let those heads work for you, yet keep duration down. You could also do a custom 227/231 if you wnat that size range specifically.

 

Will thoese comp lsl cams work for a 4.8 with 243 haeds? And do you have part #s for the two cams you described?

 

Yes, They even have smaller cams down to 215/223 for smaller engines, or trucks that require torque. This is wehre I found the data on the cam I ended up buying. I also got the FAST LSXR 102mm intake! The truck screams now! I dont know why intake FAST LSXRT intake they made for trucks hasent caught on yet.

Most people "should" use cams on this page.

 

Sweet! Thanks for that info.and that new truck intake was gunna be my next post here to see if anybody has it yet.but since you said your truck screams now,i will now start saving up for that intake.

 

FAST says it worth 17-25hp. I know two or three guys who have run them and say the difference is increadible! Although I havent seen a dyno graph, FAST did release a stock 6.0L dyno graph and a modified 6.0L dyno graph. I have seen a snap shot of the runners, and they are straight as can be, ulike the car versions that have to curve to fit the manifold. Im no expert but air doenst like to curve, it likes to go straight.



EDIT: I did a quick search and found some TBSS guys shot of the runners...

 

My truck is a 2007 new body that has the non cable throttle body. Do you have any ideas on any aftermarket t/b? trick flow and holley have nothing for my truck.

 

Your 90mm TB bolts onto it. Im running a DBW 90mm TB on mine myself.



Remember the TB opening has nothing to do with power as long as its not a restriction. The runner design in the manifold is what makes the power and torque. THey create there own individual flow and velocity. The throttle body just has to be big enough to feed them.

 

Awesome! You gave me alot of info about my future mods.what are you running?

 

I really like that FAST LSXR 102mm intake...maybe some day...