91thirdgen

was just wondering if there was anything specific i had to be looking for in a set of headers for the lt1swap in a 91 z28.
longtubes prefered
thanks kyle

jrs84ta

look at the lt1 swap questions and answers all the info you need is in there.

Air_Adam

Any SBC header will bolt on, but one with tubes 1-3/4 would be best, as the D-shaped exhaust ports are too big for a 1-5/8 tube to cover without causing a restriction. The 1-3/4" Hooker longtubes would work well I think.

Also, remember that LT1 engines have angle-plugs.

Firebat

iTrader: (7)

Hooker or Hedmen for longtubes.

I think Hedmen even makes a long tube header with d ports, can't remember if they are 1-5/8" or 1-3/4" though.

I have hooker shorties and I did have to sand/grind down the flange that bolts to the head to stop leaks. Other than that, its nice to work with. I can change all of the plugs from the top in 15 minutes or so. However, I recomend Hedmen if you go with shorties because they are d port and people have had almost no problems with them.

Klortho

Hedman makes both LT and shorty headers for 3rd gen with d-ports and angle plugs and I remember someone saying that the LT's tuck up closer than most out there.

BCdawg57

iTrader: (1)

Hooker 2055's. They have 1 5/8 primaries so they will cover the D port...and they come with a y pipe.

Klortho

Actually a little bit of work has to be done on the header port because the oval port blocks off part of the D at the bottom of the exhaust port on the head.

five7kid

iTrader: (14)

1. Weld around the outside of the primaries at the flange (basically, re-weld the primary tubes to the flange from the outside).

2. Port match the flanges. You may have to weld around the port side of the flange to provide a gasket sealing surface (meaning you'll have to flat grind over all 4 ports).

A pain? Yes. But, what do you expect? We're into the "hobbyist" phase with these cars, and the aftermarket simply can't be expected to support the "odd" combinations we're coming up with to make our cars "ours".

BCdawg57

iTrader: (1)

Damn....well that sucks! are there any d port shorties that come with a y pipe?

That was just too convienient.

Firebat

iTrader: (7)

Do you think you would have to port match with hooker 1-3/4 oval primary longtubes or do something like that?

Klortho

Hedman makes d-port shorties for angle plug heads, and they also make a y-pipe for those headers, you can do a search in the LSx/LTx swap forum and find the part numbers, don't remember them off the top of my head.

five7kid

iTrader: (14)

68479 & 17534.

Dyno Don

iTrader: (7)

Mine do.

KrisW

iTrader: (5)

Damn! That is such an awesome setup! I hope you sell a ton of those. If I was a chevy guy, I'd certainly buy them.

Nice work!

BCdawg57

iTrader: (1)

Wow those are nice.
I sent you a PM on them