Raised height valve spring retainers?

[timk225]

I was on the Hughes Engines website looking at Slant 6 parts and saw these.

https://www.hughesengines.com/Index...vel1=UmV0YWluZXJzLCBMb2NrICYgQWNjZXNzb3JpZXM=

If I'm reading it right, these are to install the valve springs at a higher height than stock spring retainers, for less spring load when needed?

If I went all the way to putting the smallest whiplash cam in my /6, I'll give it new valve springs, likely the 1110P springs. I am guessing those are stock 340 replacement springs. But I don't want any more spring load than necessary for less cam lobe wear and less camshaft turning resistance overall.

 

[slantsixdan]

You could make a better cam choice. Dutra RV10RDP, grind № 2106R from Oregon Cam.

 

[Charrlie_S]

Why not use the springs/retainers that are recommended? Those cam specs show fairly short duration, and large lift. That would equate to a fairly agressive lift rate. You will want to make sure the valve train follows the lobe, and doesn't "bounce".

 

[Bewy]

This is good advice from Charrlie.

 

[RustyRatRod]

I was on the Hughes Engines website looking at Slant 6 parts and saw these.

https://www.hughesengines.com/Index...vel1=UmV0YWluZXJzLCBMb2NrICYgQWNjZXNzb3JpZXM=

If I'm reading it right, these are to install the valve springs at a higher height than stock spring retainers, for less spring load when needed?

If I went all the way to putting the smallest whiplash cam in my /6, I'll give it new valve springs, likely the 1110P springs. I am guessing those are stock 340 replacement springs. But I don't want any more spring load than necessary for less cam lobe wear and less camshaft turning resistance overall.

That's not how valve springs work. You don't arbitrarily choose a valve spring based on what you think. You must use what the camshaft maker recommends. Also, the Hughes spring you posted is a pretty stout single spring. It can even be used with a hydraulic roller. I'm unsure even Hughes recommends it for their slant 6 cams.....but then, I wouldn't use Hughes parts anyway.

 

[timk225]

That's fine. I'm doing my research now to pick the best parts later. I thought that single spring had some pretty high open pressure numbers, I wasn't certain I'd need a spring that stiff in the case of any cam I'd put in.

 

[Dave999]

you can use them to get more spring in but be aware that the higher the retainer edge sits the more likely it is to hit the rocker. really depends on the rocker shape and where they sit when the cam is on the base circle. you might have to shim up the rocker shaft and buy custom pushrods i.e a fix for 1 issue or a change in one area has knock on impact $$$ in others