Mixing valve guides?? 95 F355

Not a mechanic either, but to me your advice seems right as I imagine there would be balance issues if he doesn't.

 

Replace them all while you're in there. If some have gotten bad already, when will the others go? Don't take the chance. Call Ricambi and get the manganese bronze guides, better choice than the factory replacements.

 

Exactly right mate!

The mechanic must be on crack or what??

 

He just wants to replace the other guides later, that's all.

 

You are on par 285 ............... replacing them all is the proper fix....

 

I would say at least replace all of the exhaust guides. Most likely he has low compression. I have seen cracked exhaust valves from bad exhaust guides. It is in part due to the valve not seating properly on the seat. thus making the valve a nice airgap (hotspot) during combustion. Intakes are not as crucial as the do not retain as much heat from combustion. Remember the intakes get a nice cool air fuel mixture while the exhaust is nothing but flames by the guides. Bronze has no chance with heat over time. Good luck to him.

 

Change them all!!

My gosh! What is he thinking.

Do the valves too by the way.

 

Replace all the guides, the steel guides are not that good in my opinion
here are some pics that show the differences.

http://www.nicksforzaferrari.com/forzaferrariwebsite1_012.htm

here are a few pics of some 355 heads completed

http://www.nicksforzaferrari.com/forzaferrariwebsite1_006.htm

We have better pricing than most other suppliers when it comes to guides & valves as we have them made to our specifications for a long time.