Searched forum about this, only a couple of posts, Living in southern CA its always warm (lead in) is there any harm removing the heat riser from the exhaust manifold ? Performance gains,losses? Thinking of running Dutra duals so i'd buy the front manifold, cut,gut, weld the other, whatcha' all think?

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63 valiant v200 Wagon 9.5, Schneider cam, E.I. 22 mpg all day

Removing the heat riser will mean heating up the underside of the intake manifold full time. Only if you actually physically block off the top of the exhaust manifold (by replacing the intake-to-exhaust gasket with a blockoff plate of the correct thickness) or simply rotate the heat riser to the counterclockwise (heat-off) position and disconnect the spring so it stays there, will you reduce the amount of heat applied to the underside of the intake. There's little performance to be gained by doing so, though.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Does anyone have experience with this??? Block off plate should be how thick?

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63 valiant v200 Wagon 9.5, Schneider cam, E.I. 22 mpg all day

It can't be thicker than the gasket, or it'll throw the manifolds out of alignment with the head.

You seem bound and determined to do this mod. Any particular reason? What is it you're hoping to gain?

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Dan is actually wrong on this account. Removing the heat riser is a good way for your carburetor to ice up not heat up as Dan implies

Removing the heat riser may not be a problem in sunny California, but up here in the misty Pacific Northwest it is a real problem. You need some heat for your carburetor, for it to work correctly. Especially with a in-line engine a V engine is another story.

And Dan, before you come back and say I am full of it, I have run without the heat riser for 5 years now. The bottom of the intake manifold is cool to the touch. It is one of the reasons I used a water heated plate under my MC 2100 install.

Less is more is the best as I can describe it. I kinda like the old hot rod mentality, if it isn't vital strip it off. I own a hot rod lincoln ,462 .60 over, 10:5 compression, solid isky roller cam .502 lift,roller rockers,MSD everything,holley 750, blah blah.Thus the lic parts name (63 continental). I chopped off the roof and such. It was subframe braced,welded,reinforced, and all the windows were removed,regulators, A/c, insulation etc. Lightened the load 600 lbs from 5200 to 4600, ! So i figured less clutter in the engine compartment,less things to go wrong .I'm going super six (ordered AUS gasket set) and i'll have no choke, no riser, and dutra's next, so i guess its my style. Seems to me a little better air flow, a 170 auto wagon needs all the help it can get.People in Ca drive fast and keeping up can be a bit of a challenge. I'm not ready for stage 2 in this build ( shave, cam,3.91,etc) so thats why.

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63 valiant v200 Wagon 9.5, Schneider cam, E.I. 22 mpg all day

We agreed lonnnnnnnnnnnnnnnnnnng ago not to dredge up this argument again, remember?

Here, have a beer.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Looking at the design of the Slant 6 heat riser.......

It seems to me that exhaust gas flow would be smoother and less turbulent with it there.............

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

boring out the exhaust manifold to 2.25" at its exit. Seems easy enough, anyone done this? How large is it in its stock configuration?

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63 valiant v200 Wagon 9.5, Schneider cam, E.I. 22 mpg all day

Stock outlet is 2". You can bore it slightly, but not to 2¼". And if you're running Dutra Duals, there's no need to bore at all.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Thanks Dan! I really appreciate your insight on this forum and all of your help. Being new to mopars this has been a great learning experience, and thanks to all who reply to my posts and put up with my sometimes wild questions, Your all helping to save a 63 wagon from death!!

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63 valiant v200 Wagon 9.5, Schneider cam, E.I. 22 mpg all day

Did we... We have disagreed about several things, so I lose track, Any way, you are wrong...