Best Top 10 Bolt Ons For a 318
The top ten are so dependent on one another, can you really separate them and get the most out of a single one?
I agree with your post above but limited my response to the quoted above and would say yes! For sure. But which one is better than the other is up for debate as I think for “The Engine Alone” would be a 4bbl upgrade. While that would be two parts, intake and carb, the single part added on would be headers. If someone wanted to split hairs, they would say exhaust since it’ll also be said you can’t run open headers in the street.
For the exhaust after the header, one could do it very cheaply. 2 - 4’ cut down to fit the available space exhaust pipes into your favorite muffling device. Glass packs are cheapest and for me personally I hate the sound but there cheap. Then a cheap muffler. The Summit turbo or like muffler will allow the engine an easy 450 hp. Way more than that 318 will produce with just the exhaust system change.
When I went from a 2-4bbl on my ‘79-360 engine, it was a really nice improvement. The added WOT cfm was very well noticed as well once it was well tuned, the gas mileage improvement was really good. The 2bbl it replaced was shot. Very bad condition.
(Also being a ‘79, it had the Leanburn ignition system which was not working well at all. Ultimately, my one and only good working MSD VI box replaced it and added another 2 mpg’s for a total of 20 Hwy.)