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BUSY BOLTERS Are you one?  The Shop Area
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Mod | | | Forums66 Topics126,777 Posts1,039,270 Members48,100 | | Most Online2,175
Jul 21st, 2025 | | | | Joined: Feb 2000 Posts: 69 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 69 | My 235 head has an intake valve guide broken off at the bottom, about 3/4"; Valve seems straight and works properly; can I run the engine like this or must the guide be replaced?
ron | | | | | Joined: Sep 2010 Posts: 695 Shop Shark | | Shop Shark Joined: Sep 2010 Posts: 695 | Hi Ron, I'm assuming the head is currently off? To me, that's a lot of support lost for the valve. I think if it were me, I'd put in a new guide. I'm going to be putting a new set of guides in my 261 head soon. My machine shop guy said I could put them in myself. My 2 cents...  Jerry | | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | I too am assuming you have the head off and it would be a simple matter of pressing in a new one. However, make sure you get the protrusion correct. I have only GMC books, but I'm sure the Chev books gives numbers too. If you do install one yourself, you need to have a small hole gauge and a mike to measure the clearance. It is quite common for the new guides to be too small in the bore and the valves seize once the engine gets hot. Reaming new guides after they have been installed is quite common. | | |
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