Home made inline intakes, let's see 'em!!

Here is one i cast for the Chevy 230/260 series engines. I designed it to be 180 deg with equal length runners. Required the head be modified to separate the Siameze ports which i did by brazing bars on the head bolt bosses and using Devcon Plastic steel to build walls. The pattern for the manifold was carved in mahogany/ Then I made a plaster cast of the pattern, formed walls in modeling clay and cast individual runners in plaster. Finally I made fibergl*** molds from the runner castings to form the sand cores. I took the whole set to a small local foundry and they cast the manifold for me. I drilled it for a Holley 390 4bbl carb. Engine would climb a rope!

 

Nice
That is very creative. I like how you equalized the runner length by wrapping the third one around the plenum. I'm still trying to wrap my head around all the p***ages and the machining involved.
Great work.

 

I did this ~20 yrs ago. 90" blower on AMC 6 (Jeep 4.0).

The model.

Wood, epoxy, micro balloons, aluminum & paint.

The plug


The core box


Finished manifold




What an experience. Learned a bunch of different stuff. I built it. Fewer came than I thought. 315 hp @ 8#/242". Nearly 500 ft lb @ 3800 & 16#/286" stroker. I ran short on fuel delivery on the dyno and detonated there. As far as we ever took it. I still have one in a 3100# car, been off the road since '08 though. It had the meanest 70mph roll on. We also stroked and bored those engines to 302". They put their shoulder into it too.
Mike

 

Machining was the easy part! Sanded the surfaces on big belt sander, drilled the flange using gaskets as guide, drilled carb mount the same. Biggest task was envisioning the relationship of all the runners.

 

I'm an I6 nut from the first time I turned a wrench. Ford I6s. I have a '67 Mustang with a 200 that I'm doing a 2x2bbl setup and a '93 F150 with a 4.9L that I'm building an LS head for.

When I started my engineering program I wandered through the Art Dept cause no one in my dept knew anything about casting. I started casting bronze and some other stuff. Bought a 3D printer and started doing my own designs. I got to the point where I developed this, then life happened, job loss during Covid, divorce, etc etc.
I plan on casting the adapters and the central pivot.










Here's the sacrificial negatives. PLA burns out very cleanly with plaster investment. I'm probably gonna shell cast these though.

 

Made a 3 Weber IDF manifold for my Wayne 12 Port Chevy:

 

i think the bar has just been set !!-wow...

 

Made a 3 Weber IDF manifold for my 292 Chevy w/Sissell/Duggan head.