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Cobra Forums
The Terminator
Engine/Tuning
Valve springs
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<blockquote data-quote="SlowSVT" data-source="post: 10293581" data-attributes="member: 20202"><p>The seat pressure on the factory Terminator springs is about 65 lbs. The area on the back side of a seated valve is a little over 1 sq in. Subtract 17-18 lbs off the seat pressure, factor in used springs that have fatigued somewhat and you get the picture.</p><p></p><p>I wasted a set of very expensive heads (guides and seats) from over revving the engine floating the valves :nonono: I would say getting new spring with higher seat pressure is a good investment. Something on the order of around 100 lbs would be a good target.</p><p></p><p>Haven't heard of factory ratainers failing but powdered metal in that place makes me nervous. Consider steel retainers.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 10293581, member: 20202"] The seat pressure on the factory Terminator springs is about 65 lbs. The area on the back side of a seated valve is a little over 1 sq in. Subtract 17-18 lbs off the seat pressure, factor in used springs that have fatigued somewhat and you get the picture. I wasted a set of very expensive heads (guides and seats) from over revving the engine floating the valves :nonono: I would say getting new spring with higher seat pressure is a good investment. Something on the order of around 100 lbs would be a good target. Haven't heard of factory ratainers failing but powdered metal in that place makes me nervous. Consider steel retainers. [/QUOTE]
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