03/04 346 camaro/firebird H.P. adjustment

[Ed Wright]

Originally Posted by countrypuppy4865

Upon my own research, I have gathered that the 405hp engine for GT was previously rated the same as the regular LS1, but the 405hp version has only one casting number for the head. This casting number is not the same as any other LS1 engine. Therefore this makes this combo different than the others. Is there 90hp more in this head? Absolutely not. However, it is listed with only one casting number for the head.

Jimmy, isn't that the Vette LS6? 405 is the factory rating, I believe. If so, it should be stick-only, like the 1996 LT4 Vette engine. Different cam. The differences are moot for an S or SS engine. No reason to use it.