VCCA Home Forums TECHNICAL - GENERAL Mechanical - Engine, Trans, etc 4 cyl valve replacement

In rebuilding the engine for a 1927 Capitol AA, the shop is recommending replacing the original valves with later-model valves, retainers and keepers. The reason they want to do this is the fact that the integral guide bores are badly worn. It would look different, of course, but obviously wouldn't be visible if the valve covers and felt pads are installed. They think it will work very well, but my concern is that the valves would not be "correct", and even a cursory inspection would turn up that fact.

Should I be concerned about this? Since I am doing a total restoration with an eye to having everything correct, do you recommend that I stick to original valves?

VCCA 40832

Really it doesn't make much difference. You can go with the later valves, springs and keepers or you can have guides installed in your head and use original valves. I prefer to go with the installed guides and original valves. Don't get caught up in the excitement and install hardened seats. They are just not needed.

In this case I will likely go with the later valves, since they are in stock, good quality, and a good fit. The machinist recommended this, but at this level of detail on the rebuild I thought it best to check here first. We are not installing hardened seats.

Ray, Pushrod or Chipper. is there a vendor that will supply the original valves, keepers and springs, or would you simply fabricate the keepers and use modern springs and if modern which one? for the 28? I think I may have located a head that is re-buildbable.

mack their are all different kinds of valve setups you can get the original in stainless from e**** richard mann uses a valve and spring setup from a case tractor . i use the progessive valve book get the right stem and head size in stainless cut the length cut the slotts in the mill in the original position only takes a few minutes to do after set up about 5.85 a valve . i have heard of using the 350 chevy valve ream the guides to fit cut off the length some and use . i like the original set up not going to reinvent the wheel . probably there are some nos valves around i have found a few 28 but the early 27 and down seem to be hard to find at the swap meets i attend . i can find out from richard about the case set up saturday as i am going to be in kansas .you wont be in a big hurry as your car runs awful good and wont need a head for forty years unless you keep using that mmo let me know oldpush

The engine shop is installing valves in the '27 engine that are the exhaust valves made for the Buick 231 Turbo V6 engine. These valves work for both the intake and exhaust of the 4 cyl. Some minor work is being done on the valve stem to shorten it, and on the valve face, but overall these appear to be an excellent fit.

That is good news and good info to know from both Of you Pushrod and Corona47, thanks.
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