I just bought LT1 heads & intake to do the conversion on my GTA (assuming I don't get screwed by the seller...). They'll be installed on my 350. I was wondering if the SLP 1 3/4" shorty headers (p/n 3005C) will fit the LT1 heads. I know they'll bolt up, but I don't know if spark plug clearance would be a problem. That seems to be the biggest issue with using these headers that I've found thru my research, and I don't know what spark plug angle the LT1 heads have.

 

The angles plugs should normally improve plug clearance. They sure did on my hedman shorties.

 

you are clear for installation!