I have some old G heads and I can't get them to hold compression. Since I have neither the shop, the knowledge, or the inclination to try to post them, I am thinking about having them posted. Any idea what that would cost or is it even cost effective? If that won't work I guess I will search for another set.

Jan  Urbanczyk  Major USMC Ret.

                                                                 Bowie Maryland

Unposted heads should be perfectly fine for most street applications. A normal displacement Y with flat top pistons will not have too much compression for them. How much compression are you talking about?


Lawrenceville, GA

I am probably around 9.3 with domed pistons. I thought I could get away with these heads but it is not happening.

Jan  Urbanczyk  Major USMC Ret.

                                                                 Bowie Maryland

I'd expect 9.3 to be well within the limits. That's about what I'm running, unposted with no issues yet. Make sure there are no other problems, like incorrect or worn out head bolts or warped deck surfaces, excessively milled heads, etc. Are you certain the compression is not being lost elsewhere, rings, valves?



Here is some reading material. It looks like it's pretty simple to achieve at home. Show the procedure outlined in the link to a few local machine shops to see what they'd charge. I don't know what it will cost but it should be far less than acquiring a set of posted heads and having them built.



http://www.y-blocksforever.com/forums/Topic57138-3-1.aspx?


Lawrenceville, GA

If non-posted heads can hold 1.5 bar of boost in dragster, those might work well in street driven Y also.


Hyvinkää, FI

In reality, we drove that 8.723 with ECZ-C heads with 21 psi of boost and blew a head gasket. With 10-14 psi there was no problems, so I really don't think non posted heads are your problem. Just make sure your decks and heads are straight.

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

Everything in this motor is new and includes ARP headbolts. I have the heads off now, but have not been able to measure them, but I suspect that they have been milled too far.

Jan  Urbanczyk  Major USMC Ret.

                                                                 Bowie Maryland

Another indicator for me is the fact that the heads are leaking at the points that Ford saw and added the posts.

Jan  Urbanczyk  Major USMC Ret.

                                                                 Bowie Maryland

Did you have the heads checked for flatness? There are several ways to post your existing heads. One method is to drill a hole through the head at the post location, thread the hole top and bottom and screw in some 1/2" threaded rod. The head is then milled smooth on the bottom. Another way I was told was to drill through the top only and screw in some threaded rod tight against the bottom surface the check for flat. The top area will need cleaned up also. Seems simple enough. I'm sure John F. And Ted E. can get more precise on this fix. Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

I am going to measure the heads and see just how much they have been cut. I have printed the whole sequence from this site so if I go that ways will have something to show the machinist.

Jan  Urbanczyk  Major USMC Ret.

                                                                 Bowie Maryland