Ok guys been thinking about building one of these for awhile now, finally decided to pull the trigger and start gathering parts. My plan is to be N/A then later one when the money is right i plan to slap a turbo on it.. Figured ide get some of your guys input since i know some guys on here is running quick 370's!!!

Part/Specs
-6.0 block of course bored .030 with all new bearings and freeze plugs
-ARP main studs and head studs(maybe go just bolts on heads)
-stock crank(prolly polish it)
-forged scat rods
-forged flat top diamond pistons
-Undecided on heads possibly 317/ls3
-ls9 gaskets
-ls2 timing chain
-texas speed ported oil pump
-undecided on lifters and cam..any imput?? isky??

what do you all think??

 

I think it'll be a fun build!

I'd probably stick with the cathedral heads and go with the isky 218/218 on a 112. I would guess it's the best One that will run well NA for the time being.

 

All sounds good. depending on how much boost you plan and what fuel I might think about a 799/243 head. They seem to make better tq than the 317 heads NA due to a more efficient chamber. The aftermarket flat top pistons usually have 5cc worth of valve notch so won't be much more compression than a factory 7cc lq4 piston. I run my 218 cam in the nova and love the tq it makes in the 6.0L. If a guy were going to be a tad over 10:1 there is also the 221/224 that would work well both NA and boosted. All depends on turbo, converter, fuel etc planned and how long it will be NA for.

 

plan is to run around 15 pounds of boost on 93 pump gas but with meth, on a kb 70mm turbo setup in the future, as for fuel run stock bucket with two walbro 400 upgraded lines etc..

Specs on the pistons. these are from thompson
-1.6cc (flat top w/ valve reliefs)
Compression Height: 1.331"

 

Must be shallow reliefs then and will be better off with 317's. Also that is the cr height sounds like it might be for the stock ls1 rod length which uses the .945" pin. I normally go the 6.125" rod with .927" pin. Saves a little weight.

 

your right i somehow looked at the wrong set heres the set i was actually looking at. these will work with 6.125 rods

Diamond 4.030 -1.6cc forged rod 370ci - Thompson Motosports - Thompson Motorsports is the leader in...

 

That's a decent looking piston similar to the Autotecs I use in my customer builds. Just watch the deck height with that CR height you are going to be down in the hole about .010' vs the factory piston which will effect compression ratio and quinch unless you deck the block accordingly or run a thinner head gasket.

 

Do you think i should look at another piston?

 

I think you will be fine just be sure to set deck height accordingly. Factory lq4 and 9 piston sits .008" out of hole and gasket is ~.055" thick. If you used a .040" gasket with that piston it would prob be about perfect. Only problem is if you plan on boost later the ls9 gaskets are best and they are about .055" as well.

 

my plan was to square the deck up when i send it to be machined