I have an '87 IROC z-28 with a carburated (750cfm QJ) 305 engine. Second owner, with only 3600 original miles on it.

Here's my question. The intake is cast iron and the valve covers are steel. Shouldn't this engine have an aluminum intake and valve covers? My last Z came that way, but that was in '71. And it had a Holley carburator. I just want to be sure I have the original engine.

Most everybody else I know that has an IROC Z has the TPI setup. The dealers can't tell me one way or another either. The ID stamp on the front of the engine is buried under accessories so I can't read it. And, to be honest, I don't feel like digging it out just to read it.

Anybody else out there have the LG-4 engine with a cast iron intake?

Geno.

 

No, The LG4 was your stock base (low cost) engine on the IROC-Z and didn't get any extras on it.

 

Thanks for the info, Man. As much as I researched I couldn't find anything that stated for sure that this engine came with the cast iron intake. This car is a keeper for sure. And if that's how she came from the factory, then that's how she's gonna stay.

The "G" Man.

 

You could look at Edelbrock for the spreadbore intake for a 87 to 95 or before intake that will bolt up, assuming a 87 roller motor. Also, I believe the 84 305 HO had a aluminum intake, as another option to use. Which Q-jet do you have, is it the computer feed-back type?

 

I read your beginning of your tread wrong, with that kind of original miles, you can leave it alone and enjoy.