05-07-2018, 08:05 PM
I can add testament to the deformation.
I have just fitted the valve guides to my new block (I used the freeze the bushes and warm the block technique and it worked well).
Before inserting the guides, the valves were a lovely fit. After fitting them the valves wouldn't go.
I reamed 9/16 and created a fair amount of swarf (clockwise in, clockwise out), result is again a lovely fit for the valves.
I was surprised how much cast iron guides must have deformed, let alone what would happen with brass bushes.
When i did my rear springs a while back the bushes were a sliding fit, but I still found reaming useful to align both sides perfectly for new pins.
Andy B
I have just fitted the valve guides to my new block (I used the freeze the bushes and warm the block technique and it worked well).
Before inserting the guides, the valves were a lovely fit. After fitting them the valves wouldn't go.
I reamed 9/16 and created a fair amount of swarf (clockwise in, clockwise out), result is again a lovely fit for the valves.
I was surprised how much cast iron guides must have deformed, let alone what would happen with brass bushes.
When i did my rear springs a while back the bushes were a sliding fit, but I still found reaming useful to align both sides perfectly for new pins.
Andy B
Enjoy yourself, it's later than you think!