A little creative engineering can solve this kind of stuff, as has been mentioned us a larger OD guide and cut it down, find a guide intended for something else that fits, etc. We do this all the time on our 427 Ford stuff, sometimes changing from 3/8 guides to 11/32 or even 5/16 for weight and airflow reasons, guides come in all shapes & sizes. Simplest seal to use is the Ford "umbrella" type that came in millions of engines at 11/32 and 3/8, very good oil control for cheap, and register on the valve stem so they still offer some control if the guide/ stem gets loose. Have to check if the seal will fit inside the valve spring, and if there's enough clearance between the retainer and top of the guide at full lift- sometimes a little trimming of the top of the guide will get you there. The Perfect Circle- type seals are a little more work to install, using a cutter that registers inside the guide and cuts the OD to size for the seal, and also cuts down the height of the top of the guide. They push on over the guide top and don't float with the stem, so if the clearance gets sloppy, the seals don't last long- the PC seals are really more for high-performance engines with double or triple valve springs that don't have much room inside for a seal, and the top of the seal is thinner for more retainer clearance at high lifts. The will work OK on a fresh engine with good stem/guide clearance, but aren't really meant for long-term "beater" engines The 427's also have shaft rockers, and the sloppy shaft/ rocker fit problem really shows up with the high volume/pressure oil pumps we use, they will quickly fill up the valve covers faster than the oil can drain back, to the point of running the pan dry. We routinely use a Holley jet or similar in the passage to restrict the oil to the rockers even with fresh components when running big pressure & volume
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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