318 Port match heads to Performer RPM Intake
OK, here you go
91 TBI stock 318 cast iron intake, left
74 stock 318 cast iron intake right.
The 91 intake has quite a few improvements over the 74 intake.
Both are Dual Plane intakes so that is a good thing.
Like the underside of the 91 also, nice and clean and they did away with that insulating tin that holds carbon chunks like came factory on the 74 intake.
74 intake underside with the insulating tin permanently removed and carbon chunks cleaned out.
Drilled and tapped the 91 carb mount area just slightly larger than the earlier stock 318 2 bbl bolt pattern to fit the 4 bbl adapter best, and get the threaded holes in the best spot on the plenum.
91 4 bbl adapter
The 74 intake uses the stock 2 bbl mounting threads for the 4 bbl adapter.
OK, here you go
91 TBI stock 318 cast iron intake, left
74 stock 318 cast iron intake right.
The 91 intake has quite a few improvements over the 74 intake.
Both are Dual Plane intakes so that is a good thing.
Like the underside of the 91 also, nice and clean and they did away with that insulating tin that holds carbon chunks like came factory on the 74 intake.
74 intake underside with the insulating tin permanently removed and carbon chunks cleaned out.
Drilled and tapped the 91 carb mount area just slightly larger than the earlier stock 318 2 bbl bolt pattern to fit the 4 bbl adapter best, and get the threaded holes in the best spot on the plenum.
91 4 bbl adapter
The 74 intake uses the stock 2 bbl mounting threads for the 4 bbl adapter.