487X heads

[travis]

Would these be a decent choice for a low $$$ 350-400hp street engine?

I’ve been dragging this things around for close to 25 years Iirc, they are 176-177cc on the intake ports, with the biggest bowls I’ve ever seen on a set of factory heads. All I’ve done to them was blend the bowls and clean up the ports. They need valves, and machined for screw in studs...they are still 1.94/1.50’s but the seats are shot so they will need cut for bigger valves. I’ve already got valves, studs, guideplates, springs, etc...the machine shop quoted me $400 for guides, hardened exhaust seats, etc.

I know the chambers are more detonation prone, but with a small .100” dome I can get 9.75-1 compression which should be doable on pump gas.

[Alaskaracer]

They had their day, and it's long gone. You're better off getting a brand new set of more current heads. You'd also be way ahead in performance. If you were doing a project that required numbers matching or a nostalgia thing, they would be fine. But not worth putting the money into in my opinion.

[F-BIRD'88]

With the large chambers they are better used on a low budget supercharged 350 motor project with dished pistons.
For n/a you'd be better off selling or trading them for a 64 cc hi perf casting for a flat top 350 project.

Potential sale for a superstock builder that needs stock castings.

[mag2555]

In terms of iron heads you can pick up a rebuilt set of Vortec heads and be ahead of the game in terms of power.

[Newold1]

X4

[ZIGGY]

Potential sale for a superstock builder that needs stock castings.

And for circle track guys running under "cost saving" rules.

[Brian W]

Buy a new set of EQ heads. Much better quality and performance and probably cheaper then fixing those.
ch350I is 76cc chamber updated copy of a 441 head.
CH350H is a 64 cc chamber hybrid head that uses all old style bolt on stuff with Vortec style chamber.
CH350C is a Vortec style head and is much better then a factory GM vortec head.
All of these are a little under $300 each for a brand new head.
I have all above on the shelf if you choose to go this route.