my combo

[mjcotroneo]

alright guys looking for yalls input since im not a guru on the lsx motors . ok what yall think about doing 408 with 5.3 heads and z06 cam and springs?

[RedHeartbeat]

I'd call Billy at TRTTurbo a call and work with him. He can get everything you need for great prices. He's done a few 408s and knows what works. If you just want parts he can help you out, also. I think if you try the 5.3L heads on a 408 the compression is going to be like 12:1. He can let you know for sure.

[bud8fan]

what red said...

[Defunct SO]

you would choke the motor to death with 5.3 heads. You need heads to let it breath; 2.08s/1.6 set up for larger bore motors. Also, for example with Wiseco pistons, K394A3 -8cc and 64cc heads, you will be a 11.2 ish compression. Thats plenty for the street or shall I say about the limit for pump gas.
The Z06 cam is not the way to go. I assume you are doing it for power. You will need a much larger cam in the 240's,
.600 and 112- 115. The larger lsa will yeild a little less power, but not much and be more driveable. You can have a good running 500rwhp 408 that will take much more.

[mjcotroneo]

damn, alright well i was looking for more compression anyway but i wasnt thinking that much haha. and i already got the 5.3 heads. is there anyway porting and polishing would help? hey trttrbo do you have a shop in arlington? oh yea and i had a question abt the transmission, will the half bell housing bolt up to the lq9? or will i have to change the housings out? (cant remember if i already asked this) haha thanks guys. oh and redheartbeat you were right about the engine stand bolts.

[Defunct SO]

You can do more compression, but do you want to run pump gas?
If they are standard 5.3 heads, I would just sell them. You will need good heads. Depending on $$, Patriots are less; AFR, and ETs are expensive. What is your goal anyway?
Yes, we are in Arlington 2 miles north of I-20 on Cooper.
Unless you have a built tranny, it will need to have a performance rebuild.

[mjcotroneo]

nah its not really built but i gotta a good friend that will help me on that. yea i want to run on pump gas, but i also want some serious power atleast 500rwhp. im doing a 408 but i wanted to do it on somewhat of a budget already got a 6l bare block ($350) and im takin it to a friend to get it bored ($80). i know i was gonna put some serious money into internals and valvetrain. i just didnt want to spend a shit load on bare heads. how abt 317 heads? if the 6l heads will work what will need to be done to them if anything at all.

[RedHeartbeat]

Buy the L92 heads and intake assembly. The valves flow 300+, comparable to any performance valve job. The heads are under $400 each new, the intake about $550 with TB, fuel rails and injectors. Sell the 317 heads to offset some of the expenses.

[mjcotroneo]

ok well if i didnt go that route could i use the ls6, ls2, 317 heads. could i do that and achieve at least something close to my desired hp/tq

[RedHeartbeat]

Of course you realize the 500 RWHP is almost 600 at the crank. You're going to need some deep pockets to hit that goal. You won't be doing that on a budget.