273 build ?????

If it was me? I like to play with the little motors..........

There was a reason the marine, and the higher output 318's, and 273's had single plane intakes. With the small ports, they actually make more low end, and top end form them. Velocity is the key, no need for a dual plane in small port form.

So with that in mind.

I would get an old single plane 273 manifold, torker318, and Holley streetdominator. (All good manifolds, work great with the stock head 273/318)

Then, cam, go solid. Because it is a 273, it will have to rev, or the ricers will eat you for dinner. That said, cam.


390144 ISKY. Bit O lumpitty, runs good in a 318 till like 6K, work great in a 273.

390177 Sounds yummy on the catalogue, never tried it.

Also, on the small port heads, I stay away from cams with too much of a longer ex duration. One, because they make more low end, which is important on the small port engines, and two, because the int/ex flow difference isn't as huge on them. Ditto the bigger EX valve, I have heard that before on the 273's, leaving the intake alone. I think it has to do with the small bore shrouding the bigger intake valve.

Solid Solid Solid. (A quick search, and you will see tons of hyd cam blues, no lifter float, ahhhh, and they sound so cool!)