308 Hudson heat riser fix

metalchipper2

Hello,

I would really like to hear from someone that would answer -correct my understanding of the following.

 On the topic of the Twin H-manifold's heat riser. I understand that with today's gasoline that burns hotter the heat riser should be removed, holes plugged and that enough heat from the engine should keep the carbs from icing up. Also part of the problem is air leaking by the riser shaft introducing oxygen that makes the exhaust burn hotter.

So my question is, after the riser is removed which opens up the passages into the intake.... which to me would allow too much heat up into the intake.

Should I fix a new riser in the open position? And or block off the passage into the intake with a plate of stainless steel? I understand that the surface would need to be reduced.

Also by fixing a new riser, it would be made to smooth the flow out to the collector. Covering up the passages that direct the flow up into the intake. 

I hope the photos help explain my problem.

Thanks,

Metalchipper