[Jerry Clayton]

Thanks Rick

However---the guides did not crack from being installed into the heads--they cracked because they had been cut down for pc seals, then bored oversize to install guide liners which were then swedged out to the guide-----if you install lighter(thinner stemmed ) valves there is more material left in the guide tip!!!!!!

The pc seal will hold the top of the guide in place without problems

Now, on the other hand---he could of used a solid bronze guide and not had this problem, however the results of what I see in the pic is the result of many rebuilds---first worn guides, second--bad umbrella seals, third cutting thin guides even smaller for pc seals for 3/8 valve stems, fourth--drilling reaming guide out for bushing , fifth--swedging bushing out to guide

Valve discussion---after repeated rebuilds the valves were getting thin and a few ( at least one in the pic) had been replaced so it was thicker on the bottom----

The quality of the seat install has no supporting pics as well as the remainder of the valves and guides----were these the only three split guides?????