55.2-59 58 SWB + C4 + LS1 - Header Help

[QBRacing]

OK. Getting closer to finalising the engine bits an just wondering what the LSx conversion people are running for headers when the use a C4 Corvette setup like the flatout engineering kit.

I tried the factory cast headers I have from the Holden I got the engine from and they just touch the bolts on the rear upper arms by the exit of the exhaust ports for #3 and #4 cylinders .... If only they were steel and I would have just massaged them slightly. (refer my attachments)

Next has anyone heard of or used speed-engineering. He has a couple of sets of conversion headers which look like they should work (1021 and 1029) but before I commit I'm thinking why not ask as someone bound to have played with this before.

Q

[bigdaddyfuselier]

Try 2014 camaro exhaust manifold.

[FleetsideBill]

I used the speed engineering headers they fit great
I’m not sure how it will work with your motor mounts and steering linkage

[BIGglaSS]

2010+ Camaro manifolds typically fit anything. Here's camaro manifolds with camaro front clip, to show you how they tuck up to the block.

[Dan in Pasadena]

I used Corvette Z06 exhaust manifolds on my LQ4. They're good for over 500hp I've been told. No need to go through the gyrations it takes to fit many headers.

[akdg87]

TBSS manifolds fit really tight to the block and should allow your steering linkage to work. I used a driverside one with my turbo kit and it fits awesome.

[jaws61]

i used a set of speed-engineering with my truck with a mustang ii front end and got them to work, Had to cut off the passenger side 4l80e ear, The driver side is really close to the steering column but they look sweet, I'll let you know how they run in a month....

[daveshilling]

I used Trailblazer SS (TBSS) Manifolds on mine, they fit really tight to the block and allow plenty of space for steering components. I have my engine mounted really tight to the firewall so I imagine that changes things a bit, but they still work really well.

[jwhotrod]

I borrowed a set of C4 headers from Melrose corvettes in Cortland,IL to test fit on my ls3 build (55 chevy truck with Flat outs C4 suspension. They fit great. Come both uncoated and coated would be a great choice.