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| | | | Joined: Jun 2009 Posts: 331 Shop Shark | | Shop Shark Joined: Jun 2009 Posts: 331 | Hey guys, just wondering if the Chevy 235s are an interference engine or not. Some people I've talked to about my engine issue think that one of my valves may b=have gotten stuck and the piston hit it, bending it. Sound likely? I assumed they were non interference but maybe I'm wrong.
PS, doing a compression test tomorrow or the next day, should give me some more clues.
| | | | | Joined: Mar 2005 Posts: 1,636 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,636 | I have never had that happen to me. I have had a couple of 235s that a valve stuck on them. Once freed up they were fine. I think the valves are to far up in the chamber to be of very much riskl of a piston hitting them.
But some one may know more about that and tell us. | | | | | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | The only sticking valves I've heard of stick shut & bend pushrods rather than stick open. I don't know if one stuck open will strike a piston or not. Now I curious. Anyone know?
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| | | | | Joined: Feb 2004 Posts: 29,746 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,746 | With the layout of the valves in the head, it would be impossible to get valve/piston contact. The only valves that get remotely close to the piston also overhangs the block. It would hit the top of the block before it could reach the piston.
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| | | | | Joined: Dec 2008 Posts: 1,922 'Bolter | | 'Bolter Joined: Dec 2008 Posts: 1,922 | The intake valve is directly above the piston at TDC, with very little safety margin. If the valve sticks in the guide, since the valve is nearly vertical the piston may just push it back. If not, the valve bends or punctures the piston dome.
The exhaust valve can't hit. | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 |
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Mar 2005 Posts: 158 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 158 | Sorry, realize this is an old thread, but thought I'd contribute if anyone else is curious.
I floated an intake valve (over-revving the motor) and can confirm it WILL hit the piston, resulting in much carnage. | | |
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