I was interested in the LT4 conversion for the LT1s and i was speaking to a rep from Pace Performance and they have discontinued the intake manifolds. He has no knowledge of any aftermarket companies that make a intake manifold that will bolt up to the LT4 heads. He was saying that maybe i could get the LT1 intake opened up to meet up to the heads but he was also saying that i might run into problems with running into the injector bosses. Any input will be great. or if anyone is selling the intake i would like to buy it . thanks Jay.