Performance Valve Kit

1JZSupra

Active Member
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ARe you planning on releasing stronger keepers? They have been identified as a weak point as well
 

kostean

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@Superpacman13 - now we're talking. New cylinder and also valves at the market to eliminate the top end reliability issues. I need to put my shopping hat on as you bring back some hope 390 can be made to be "ready to race" as it is stated on the engine cover.

With these improve valves and Ti retainers, I guess the springs remain to be the only element over what one might have some fear. What brings me actually to wonder, do you know if the 390 valve springs should also be changed after some period on racing engines? I have done so for smaller racing engines with single spring design but not sure if needed for 390.
 
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