This is an add-on for Exhaust Headers of the Ford FlatHead V8 (https://www.thingiverse.com/thing:2537602).
Be careful ; ExhaustHeader1Collector and ExhaustHeader2Collector are not the same.

Print Settings

1 x ExhaustHeader1Collector : Layer:0.15mm Raft:no Brim:no Support:yes Infill:100%
1 x ExhaustHeader2Collector : Layer:0.15mm Raft:no Brim:no Support:yes Infill:100%
6 x ExhaustHeaderGasket : Layer:0.15mm Raft:no Brim:no Support:no Infill:100%
2 x ExhaustHeaderGasketCollector : Layer:0.15mm Raft:no Brim:no Support:no Infill:100%

Accessories

4 x m3x12mm SHCS
4 x m3 lock washer
4 x m3 jam nut
12 x m3x6mm set screw
12 x m3 acorn nut

Mounting

Look at pictures.

More add-ons

https://cults3d.com/en/design-collections/dancan13f/ford-flathead-v8-engine-add-ons