I need a casting number for a good set of chevy heads for a 406sb since I probably cant afford to do fancy alluminum heads...

 

I'm not entirely sure, but I think all 406 heads sucked ballz. I belive they were all somg heads, and flowed like crap. You might want to save for a set of Fastburns or Vortecs if you cant afford the fancy-shmancy aluminum heads. Do a search on here for people with those heads and see what kind of power they are making, I think there are a few people running 400's with those heads.

 

041 ,,041x 461 462 086 these are all good flowing factory castings most have 165 to 175 intake runners and all have closed chamers should be easy to find paul

 

hey just FYI u totally dnt want to use thestock factory 400 block heads, specially if u want to make some power look at AFR or brodix.

 

also consider
Dart
Pro-action
Canfield
23degree TFS

 

i am partial to afr the single most power part you can add to a engine besides a blower turbo nos is the cyl head everbody puts all there money in to the engine and neglects the heads i would take a 305 with afr heads over a 406 with junk smogger heads just look at all the fast cars and i guarantee they all have a good set of heads on the car

 

i couldn't afford expensive heads either. i think the #on my heads is 993. iran 13.4 @105 mph with the stock heads and a .447 lift cam. they'll get you by till you can save your money.

 

As of now I am more than likely gonna run some Sportsman IIs on it..I just need to find out if I have to have the steam holes drilled in em

 

I'm using 186 double-humps with bolt holes on my 400, with some mild porting. They came on 69-70 Impala, station wagons, Monte Carlo, and other higher-horsepower applications.

Yes, you need the steam holes, you can drill them yourself. Lay a 400 head gasket on the heads, mark them (6 per head) with a punch, drill with 3/16" drill until you hit the water jacket, which is about 3/8" or so deep.