i've seen the f body guys using some stage 3 5.3L heads on their 408's with excellent results.

 

This seems like it would be a terrific truck motor. Who needs big cam durations when you've got great heads??

 

Sometimes larger heads can kill performance. I would look at ETP 225 or even the Dart 225's and a solid roller setup.

 

These heads are 200cc intake runners w/62cc chambers. They say there setup for 3.900 bore that the only thing that worries me. I just dont want to be leaving alot of power i.e 30-40hp if thats even the case. Im waitng to hear what Zach at Texas Speed says. On there 408 longblocks they put their Stage 3 6.0's on so I have no doubt these would work. The cam I have now and plan to put in the 408 is the TSP Torquer V2(232/234 .595/.598 on 112)
and I have a 3500 stall,4.10's,etc... I just dont see these I have being my best option. The funny thing is we started to plan for the head swap,and FAST intake install. I was also putting a LS6 oil pump,Timing set, and fuel pump in during the same install and we started to talk about if Im going this far and I really have no clue the shape of my bottom end it would be a shame to have the top end tight and the bottom end not. So the conversation went from taking the motor out getting the bottom end blue printed doing all the work with the motor out to getting a rotating assembly,to finally getting a 408 shortblock. This was within 15-20 minutes. HEHE! Thanks for the help on this. Ill let you know what TSP says.

Oh yeah I had already picked up some Comp solid rollers that I was gonna use on the LS1 so they will certainly go in the 408.

 

Plse inform us on performance becasue that looks to be a awesome setup you picked out. That cam is a great choice, Ive looked a TSP stuff recently, they do have some great prices on short blocks. Ive pondered doing a 6.0 swap but by the time you buy bearings, rods, pistons for the 6.0 you can buy a 408. BTW did you get scat rods or upgraded to Callies.

BTW for the prices its extremly hard to beat TSP stage 3 heads. I was looking at ET's canted valve "Thor" 285cc heads and they flow some outrageous #'s but there $7,000 dolloars for a set! I think Parish should get a set for his truck with solid roller turbo cam, with the twin setup. Just becasue 1011 rwhp aint enough.

 

I havent deceided on the Rods yet. I will either do the Scats with the upgraded ARP 2000's($70.00) or the Callies($140.00). Im trying to find out what bolts come with the Callies first. Plus I havent deceided if I want to do the ARP stud kit but I am going to do the HD rings. I have some new Comp solid lifters that will be used as well.

 

If your going solid roller and big rpms Id look at some larger heads. The runner size is the only thing Id be worried about compression can be changed with pistons.
I really like those heads I remember reading about them arent those the edelbrock casts that LPE designed a cnc program for?
If your doing the rotating assembly why not just by a stroker kit?

 

In my opinion you would be best off with a set of Dart 225's you can get them for a really fair price assembled.. yes unported but they flow like mad. I am running deep 13's with my x cab with those on a 6L with a cam. They are really nice out of the box castings. They are not afr's but they are really nice vigin casts.. For the money and the size IMO you best bet. I wouldn't use the edelbrocks too small chambers runner size isn't there..

Just my .02

 

I saw on LS1 tech someone actually made more horsepower under the curve with Dart 225 rather than AFR's! The AFR heads did make around 6 rwhp more up top, but the person was having some problems with the Dart heads I cant remember what I think it did something with either cooling or smoke out the tail pipe after he replaced them with AFR he had no problem. But im sure its a freak thing.

 

I have about 10k miles on mine so far trouble free and naturally aspertated pulling 52's though the maf every day