85tacoguy

iTrader: (1)

SO a long time ago i purchased a 2005 lq4 engine with hopes to put it in my desert racing truck. I have slowly been buying a few parts here and there but i feel that my lack of planning what i need will backfire. I want the motor to be 450+hp and at least 400ftlbs. What i have right now is Stock long block with 317 heads, ls6 intake, ls6 ported TB, ls6 yellow valvesprings, and possibly a near new ls7 cam. What should my next step be? Should i get some worked 243's and thinner head gaskets and call it a day? SHould i ditch the ls6 stuff and get l92 heads, intake and tb? Get a different cam? Let me know what you guys think. Anything will be helpfull? also suggestions on injectors would be helpfull too

Thanks

PREDATOR-Z

Different cam and port the heads (by AI).

85tacoguy

iTrader: (1)

The stock ones or 243's ?

PREDATOR-Z

The stock ones, they have same runners as 243s just bigger chambers. So AI can fill those mammoth 71cc and make then the size you want to boost compression without loosing PTV clearance from milling.

mark21742

Plus by welding and re cutting the chambers they can give you a better/ more efficient chamber design

85tacoguy

iTrader: (1)

Sweet. I like this idea. About how much might this cost ballpark? Also, if the ls7 cam isn't ideal, which one is?

mark21742

Something a little bigger like a 224 or 228 would still keep it running almost stock

85tacoguy

iTrader: (1)

Would either of the cams work well with the beehive springs? Will I be in my target HP and tq? Do I need special spring retainers or will factory ones do?

mark21742

A good set of comp or PAC beehives would work great with them...just remember, never use stock springs with anything other than a stock cam

85tacoguy

iTrader: (1)

hmm i have a brand new set of gm yellow ls6 springs... Will those work or are they a no go?

speedtigger

iTrader: (16)

If you go to an aftermarket camshaft, call comp cams and order a special cam with the correct lobes for endurance racing. A lot of the stuff that is popular for street strip guys will probably be too hard on your engine in the prolonged high RPM scenarios you are likely to see.

mark21742

No go with the yellow springs

PREDATOR-Z

Hot cam or ASA cam

87caprice318

iTrader: (1)

So with his setup, will his targeted HP goal be reached? will that be fwhp or rwhp...a good cam, 243s, thin gasket???

85tacoguy

iTrader: (1)

No thin gasket, AI will weld and recut smaller chambers in the heads to bump compression along with a port job, If i understand correctly.

PREDATOR-Z

You anderstand correctly they AI call it their 219cc CNC program.