Help with another lq4...

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Jul 16, 2012 | 02:46 AM

85tacoguy

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Help with another lq4...

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

Jul 16, 2012 | 05:53 AM

PREDATOR-Z

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From: BFE

Different cam and port the heads (by AI).

Jul 16, 2012 | 09:03 AM

85tacoguy

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The stock ones or 243's ?

Jul 16, 2012 | 10:54 AM

PREDATOR-Z

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From: BFE

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.

Jul 16, 2012 | 12:15 PM

mark21742

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

Jul 16, 2012 | 02:36 PM

85tacoguy

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

Jul 16, 2012 | 03:10 PM

mark21742

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

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Jul 17, 2012 | 03:53 PM

mark21742

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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

Jul 17, 2012 | 05:36 PM

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85tacoguy

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

Jul 17, 2012 | 05:41 PM

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speedtigger

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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.