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400WHP - best circuit engine choice


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Best bang for buckest smallest capacity NA engine available. Preferably on stock internals so the engine does not have to be opened. Exhaust manifolds may be a bit cramped in a 280ZX and the exhaust will have to exit at the rear and use a modest muffler but otherwise no external restrictions. Will be using a TR6060 gearbox if that is relevant.

 

Links to reliable sites would be good too, I know nothing about these engines so edumacate me :)

Edited by 260DET
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That 2006 Pontiac engine would also be known as a L98? If so it's the locally available one I've been advised to get.

 

Thanks for the LS1tech.com tip guys.

Edited by 260DET
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That 2006 Pontiac engine would also be known as a L98? If so it's the locally available one I've been advised to get.

 

Thanks for the LS1tech.com tip guys.

 

Nope, the 2006 Pontiac engine is a LS2, 364 cubib inches. Pontiac made the G8 in 2008 with a L76 364 cubic inch motor. That may be the motor that is in the newer Camaro's with an auto tranny.

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The advice I've received is that the LS1,2 and 6 use 243 cathedral port heads which give the best results when ported. The L98 which is readily available here as a crate engine has square port heads which flow well stock but don't port that well. There is not much choice here with LS's unless I go with much more expensive 'racing' crate engines of various types.

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LS1 use 241 heads - they say the difference is about 15 hp to the 243. I've been very happy with LS1. Stock except very mild cam and shorty headers and its 365 whp. They suck a lot of oil through the PCV so need catch cans if you keep the PCV system and need to keep an eye on oil level throughout the day. Also need some means to keep oil pressure, especially in long left sweepers. I've found 2 qt accusump and ~1 qt overfill keeps the oil pressure happy. The stock belt tensioner also doesnt like the rev limiter so either stay off it or upgrade to Katech or similar tensioner. Otherwise leave it stock and its just add gas and go. Very reliable.

 

Do it, you wont regret it.

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Thanks heavy, will keep your advice in mind. LS3's are available so will go with one of those, trying to nail down a good price at the moment. Am going to run a wet sump with Accusump, never had oil pressure problems with the VG30DET (Z32 sump) so can't see why an appropriate wet setup should not be OK on the LS. Big slicks may be different.

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Any block hugger header should work on the pass. side , that's what I have . Driver side , you might be able to use the late model Camaro shorty with slight mod . I used Fbody shorty on the driver side with modified steering shaft . Good luck .

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