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Discussion Starter · #1 ·
Hey all, been around for a while, but mostly lurk since I can find most answers by searching old threads. Couldn't find anything on this subject though.
I'll cop to being old school, but I've always restricted the oil to the top end in my racing engines. We are building a new 588 for our drag boat and my dyno guy/engine building "consultant" says nowadays, most believe it's more important to not restrict the oil but let it flow to the top end to cool the valve springs. I'm a bit reluctant as I don't want to pump a bunch of oil up top. So how about it... do you guys use oil restrictors or not...
Thanks
 

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I don't use them anymore.

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Not here, not any longer.
 

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I run them in the front of this Dart block but they are not real small. I forget the size but compared to the old type used in the GM blocks these are alot bigger. I only run 1/8 mile also. This is year two on the 565 motor and 150 passes and the springs are doing fine so far. I set them up at 310 at the exhausts are still 300 while the intakes have dropped to 270 from the heavy valves. RM
 

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I'm nobody special, but I've never used them and if something comes to me with them, it leaves without them. A lot of the stuff I do for people is driven on the street and I'd much rather have that oil up there cooling off the springs than not.
 

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I'm nobody special, but I've never used them and if something comes to me with them, it leaves without them. A lot of the stuff I do for people is driven on the street and I'd much rather have that oil up there cooling off the springs than not.

Yep.
Not only best thing for the springs but also roller lifters on a solid roller set-up. To go further, roller lifters w/ pressure fed oil to the axle and bearings is a real good investment too.
 

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Yep.
Not only best thing for the springs but also roller lifters on a solid roller set-up. To go further, roller lifters w/ pressure fed oil to the axle and bearings is a real good investment too.
X2
 

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Discussion Starter · #11 ·
Yep.
Not only best thing for the springs but also roller lifters on a solid roller set-up. To go further, roller lifters w/ pressure fed oil to the axle and bearings is a real good investment too.
Hadn't even considered the pressure fed oil to the lifters... Ours are and I guess it doesn't make sense to restrict that oil.. Good point, thanks.
 
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