quote:Originally posted by PanteraDoug: These are really a beautiful set of headers. Really nice job. Great welds.
Thanks Doug. I hadn’t looked at this post in a while.
quote:As far as a support bracket remember that these headers move quite a bit when torquing the engine…..The supports will need to be flexible. I think this is why the GT40's use the "screen door" springs wrapped around the exhaust pipes? I think if you don't do that you will stress the headers out at some point?
Yup. Mounting must allow for dimensional change at temp.
quote:How close to equal lengths were you able to get the primaries?
You can take a string or wire and measure the path 180 degrees apart down the length of the primary but it’s hard to do with all the snaking around. I used those orange building blocks for the layout and faithfully reproduced the segments in stainless bends which is probably about as accurate as trying to measure them. I’d say probably +-1/2” over nearly three feet of primary…and if so, that’s +-1%. All of the above only holds true if the exhaust pulse travels the centerline of the primary which is optimistic, what what else would you figure? –Close enough for Rock & Roll. They sound good and and were good for about 25HP over the best set of dyn headers and mufs in the shop. Hard to say how much better they are than PCar stockers but with the solid cam I'm running, I'd say a bunch compared to that.
I’ll have to post some pics of them on the engine on the dyno.