Conversions & Swaps LSX Engines in Non-LSX Vehicles
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LS fenderwell headers

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Old Dec 28, 2013 | 07:11 AM
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Default LS fenderwell headers

Am thinking about trying to modify a set of tri-five fenderwell headers for my 55 Olds 88 custom (LS2). No reason other than I think it would look really cool to see the pipes in the fenderwell area. The 55 has a large open area behind the front wheel.

Does anyone have any idea which chevy motor has the exhaust ports closest to the LS, big block or small block?

I would just look for a cheap set of un-coated headers and see what happens.

I figured I could get flanges laser cut locally.

Thanks for any input.

Joe
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Old Dec 28, 2013 | 07:18 AM
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Big block is closer to the LS exhaust spacing.
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Old Dec 28, 2013 | 09:35 AM
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Start with the BBC set, there are Flanges you can buy from GM or other aftermarket suppliers (Speedway).

Get some pictures up as you do it.
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Old Dec 28, 2013 | 07:45 PM
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Thanks for the help! If I end up making something worth showing, I'll post my results for sure.

Joe
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Old Dec 28, 2013 | 08:07 PM
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Keep in mind the bore spacing between a BBC & LS is off 0.4" per cylinder, so you'll be doing some "adjusting"...
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Old Dec 28, 2013 | 08:30 PM
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I figured on cutting and fitting to the LS openings. Should I not be worried about the huge 2" primaries for these BBC headers? Won't that affect performance?

I was looking at some of the small block designs and it seems like it wouldn't be that tough to spread (cut & weld) the center pipes apart? Assuming I'd also have to move a third port too.

I might be biting off more than I can chew, but if I can find a good deal on the headers I'll give it a shot.......
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