oil passages in lifter valley / head studs question

[Fedaykin]

Today I looked over the lifter valley and noticed the ridges that direct oil over the lobes on the camshaft. Upon closer inspection I noticed the casting not so perfect (who would have thunk). Some of the ridges are very close to the edge of the cam lobes and I wonder how well these oil directors function... do you think I should file the block a tad so the oil doesnt overshoot the lobes as it spills down onto the cam? i wonder if anyone has tested the pathways for oil accuracy.

It might just be something for the future as my block has already been rebuilt and the last thing i want is filings in my engine.



on another note... upon trying to install my arp head studs I found they would thread about 1/4" down, or about 4 threads then bind.. I examined the stock headbolts to find they are 10m 1.5m, and they have a lot of play in them, strange.... so I went to greggs and bought a 11m 1.5m tap (as the head studs are 11m) and retapped the block... the tap went in easy , a little tighter at the bottem, and only minimal material was removed, but my head studs go in the block as easy as they would a woman with 5 children.

Now for my question.. ARP gives 3 torquing tables that are sectioned under different tensile loads. but it says they are all generalized and not necessarily engine specific... what happens if I tighten the head studs down more than spec'd in the haynes manual?

[tejohnson]

Had the same curiousity as well...

Before:

http://groomlakelabs.com/index.php?q=gallery&g2_itemId=785

After:

http://groomlakelabs.com/index.php?q=gallery&g2_itemId=1745

As for the ARP studs, you want to torque to 65 lb/ft using ARP moly lube. Something like 80-85 using oil. If you overtighten the studs, and you had the block "rebuilt", you will simply distort the cylinders more than normal. Reason I say: I assume on your rebuild, the shop used a torque plate when boring -or- honing?

[Timothy]

ARP Studs

I just completed a complete overhaul utilizing ARP studs with felpro severe duty gaskets and ARP said follow the stanard sequence and 70ft lbs of torque was prefered, exspecially if using gas or boost,make sure you use thread sealant as well as some type of rad sealer.I would get there assembly lube but you can use there thread sealer as well in place of the molylube.

[tejohnson]

I just completed a complete overhaul utilizing ARP studs with felpro severe duty gaskets and ARP said follow the stanard sequence and 70ft lbs of torque was prefered, exspecially if using gas or boost,make sure you use thread sealant as well as some type of rad sealer.I would get there assembly lube but you can use there thread sealer as well in place of the molylube.

That's odd. I was always under the impression the torque requirements were based on the grade and thread of the bolt, not the usage. Are you guys using the 7/16" studs?

[Fedaykin]

they are 11mm studs, well on mine anywayz. From what I understand yes, the grade/threads of the bolt determine the torquing specs, A lot of times this is to make sure you don't pull the bolt right out of the block. Obviously the application plays a part in it as well.

my haynes manual said 41lbs plus an additional 90 degrees... I just torqued to like... 63-65.

None of the head studs pass through any water, so threadsealant was not necessary.