As for valve quality from China, I'll say not that bad. I haven't been rebuilding and building heads for very long , just about 4 years but I can say I've not seen a failure yet of just a valve.
Speedmaster valve quality
- Thread starter 66Valiant528
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NC Engine Builder
Grumpy Old Man
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I never said anything about sending him your own heads
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Up there with elgin, decent. Not high end..but fine for street performance or mild track use.
Just clarifying for the readers….. I inquired on one of the head specific threads about this subject, just wasn’t sure.
I actually sent one of my sets of W5s to Ryan J back in the dark ages as he had a cnc port design for them. He had quite the stack of them before he had them cut.
It caint be too bad, can it? That's where probably 90% or more come from and we're not seeing mass failures.
Yeah and I hate to say but if it wasn't for the chinesium stuff 90% of people couldn't afford to get their cars fixed .
That's a fact.
Necessary evil
Just a heads up. I ordered the valves and thank you to all who took the time to answer me.
JC71340
Well-Known Member
I thought the 11/32 valves are lighter, making it easier for the spring to control at high RPM.
Both are correct, as there are multiple benefits. 5/16 / 7mm have similar benefit (not as pronounced on flow, but great for weight). With the reduction in stregnth with 5/16 / 7mm size stems, the quality needs to be high and the geometry needs to right to avoid catastrophe...
I guess the seals would need to be the correct dia to match the valve stem. Do the valve guides need to be changed to match?
Oh yeah. That's a necessity.
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