ive got a 400 sbc and i have world product torquer heads off of a 305 and i wanted to know if they would work good on the 400 i have????? thanks

 

i do not know for sure if those heads will work but i think they will. if they do you must have the heads drilled for the steam hole. i had my eng. built and the shop that did the work told me that it is very importanty to have the holes drilled in the heads when using a 400 block. also i had one heck of a time getting my 400 to not overheat. i hope you do not have the same problems.

 

Right, drill the steam holes. No big deal, just 6 holes per head. Use a 400 head gasket (7733PT2 or 1014) as a template, center-punch them, use a 3/16" drill bit. It's about a 10-minute job if you stop and knock back a cold one a couple of times. Less if you stay on task.

The heads will be "OK", but far from optimum.

If I was building a 400, I believe I'd look for something else. Sell those, and get something more appropriate. Look for heads with about 200cc intake ports.

You'll need to pay attention to what chamber size and what pistons you use, because you can end up with your compression all over the place. From 14:1 or more down to 7:1, if you choose wrong.

Power comes from flow. The more cubic inches you have, the more flow you need. Those heads are set up to deliver what a 305 requires. A 400 needs ALOT more.

It's not hard at all to keep a 400 from overheating. Don't hack your cooling system. The stock one is fine. Make sure it all works right, no leaks, correct thermostat, etc.; and make sure the motor has a REAL AGGRESSIVE timing curve. The timing too far retarded is the single biggest cause of overheating.

 

thanks guys for all you help and comments much a preciative