Inliners International Forums General Discussion Engines Quick Question on Heads

Hi guys, sorry if it has been asked a million times....Are the 230 heads a small chamber size like the 194 head? Guy is wanting to put one on a 292 if the chambers are smaller.

230,250 and 292 basically used a larger chamber than the 194.
It probably won't help him.

Even when performing the apples to apples dyno test comparison(same mods done to each head each time)between the 2 heads, the 194 head always fell short of even equaling the HP and torque anywhere throughout the RPM as 230-292 open chamber head. The 194 head increasing compression is correct, but it does absolutely nothing to increase performance and power even though it adds almost one whole point of compression when compared to the big chamber head with the same upgrades, and this urban legend was debunked as a myth.

If you want to reduce combustion head size, deck the head until you get what you want. While he's at it, put a 1.94 and 1.6 valve in it too for a 292. And add lumps.

I know that the standard head can be milled to increase compression. What is the practical limit that can be done? Is there also some kind of formula that will tell how many cc's come off for a given amount of milling? Like say 3cc'c for each .010 milled off for example. Just looking for a rough idea. Thanks Jay

On a large chamber head, for every .007 cut, about 1 CC will be lost.
I also like to limit for street use decking to .030 . It can go deeper, but .030 is what I like use for reliability.

Thanks for all the responses guys! I'll let him know, When I did my 292 I took the stock head and shaved .030 and zero decked the block. Also did the lumps and bigger valves.

Thanks also for filling me in on what kind of milling is possible and what the results would be. Another possibility is a thinner head gasket but I can't find any that don't require special machine work. Is there a stamped steel shim gasket for these engines like what was used on the SBC? Jay

Test

What about angle milling it?

No real benefit for a 292 since the stock big chamber head already yields close to the limits for pump gas with conventional flat milling.