Head bolts or studs

[ChiefDanGeorge]

It's a Colony Park wagon.

[ChiefDanGeorge]

Could you explain the first one, how does that have an affect on the fasteners?

I would first base it on how the block was prepped. 

Second to that would be how much hp/compression you're working with.   However, I just built a 777 hp Clevor with 13.5:1 that worked just fine with bolts. 

A distant third would be looking at how much clearance you have to get the heads off and how often you'll be having to pull them.  Studs make it a little more time consuming to get the heads off in the event of a tear-down or inspection if you can't slide the heads up over the studs.  Of course, aluminum blocks get studs as a default.

[blykins]

Doesn't affect the fasteners, but affects the block.  Bolts will stress/distort the block differently than studs, so if your machinist used bolts on the torque plate and you put head studs in, you could potentially see a difference in cylinder shape.  Same with the mains....mains will distort so you always have the mains honed with the fasteners you're going to use.

[ChiefDanGeorge]

Ah, ok I understand. Thanks for the explanation.

Doesn't affect the fasteners, but affects the block.  Bolts will stress/distort the block differently than studs, so if your machinist used bolts on the torque plate and you put head studs in, you could potentially see a difference in cylinder shape.  Same with the mains....mains will distort so you always have the mains honed with the fasteners you're going to use.

[TomP]

Not sure i'm following the logic of drilling the head bolt hole larger so it doesn't restrict the oil and then plugging the passage above it to restrict oil.

If it blocks it off completely just file a slot from the deck up to where it intersects that passage.

Make sure the drains have room around the bolt or stud, not just the diameter of the hole, it flares around the bolt too.

[ScotiaFE]

If it blocks it off completely just file a slot from the deck up to where it intersects that passage.

I guess I could go to the file drawer and get a file, but I hate filing.
In the olden days one of the machinist apprenticeship projects was to make a file.

[TorinoBP88]

N/m

[Falcon67]

If you're putting the engine in a shock tower car, and think you might ever want to remove a head while the engine is in the car, you might want to use bolts instead of studs.

Not here.  I'm of the opinion that if a head needs to be pulled, it's all coming out and going on a stand.  I ain't lifting 50 lb heads over a fender anymore, screw that