2.7L, So why is 2.7L the motor to avoid? Options

[qa1142]

If someone is going to start looking for a 6 to build what do you want and what do you want to avoid?

2.2

2.4

2.7

3.0

3.2

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[J P Stein]

The stud issue will never be settled here. Suffice it to say that my gurus build with nothing but Divilar( for aluminum cylinders)....that would be Steve Wiener & Rothsport. Henry at Supertech had his designed & produced studs from some kind of stainless with an expansion coefficient similar to Aluminum...not Divilar but similar and he's no slouch. They are sold at a decent price, right Mark?
The Pelican 911 engine building forum has been going around & around about this for years and prolly will for the foreseeable future. Pick your own guru and HIS opinion, but don't tell me mine has no clue.

The 76-77 2.7L has the improved (larger scavenge side) oil pump plus the oiling mod, Doc.....that cost a pretty penny to have done. I would use one of those cases if you can find a straight one. Alusil cylinders reconditioned to size?

I would never use collars on tensioners. If the tensioner fails you don't have any warning like you do with a slowly failing oil fed ten. The collar starts getting hammered on, breaks and the chain goes slack. At best you'll then go buy a bunch of valves. Pick your poison.

[Mark Henry]

The stud issue will never be settled here. Suffice it to say that my gurus build with nothing but Divilar( for aluminum cylinders)....that would be Steve Wiener & Rothsport. Henry at Supertech had his designed & produced studs from some kind of stainless with an expansion coefficient similar to Aluminum...not Divilar but similar and he's no slouch. They are sold at a decent price, right Mark?
The Pelican 911 engine building forum has been going around & around about this for years and prolly will for the foreseeable future. Pick your own guru and HIS opinion, but don't tell me mine has no clue.

The 76-77 2.7L has the improved (larger scavenge side) oil pump plus the oiling mod, Doc.....that cost a pretty penny to have done. I would use one of those cases if you can find a straight one. Alusil cylinders reconditioned to size?

I would never use collars on tensioners. If the tensioner fails you don't have any warning like you do with a slowly failing oil fed ten. The collar starts getting hammered on, breaks and the chain goes slack. At best you'll then go buy a bunch of valves. Pick your poison.

The Supertec studs are about $600. If you decided to go twin plug you'll have a hard time getting past the stock barrel nuts.
If you take apart the hydraulic tensioner you can make a spacer out of tubing, but you lose the circlip. Doesn't matter once the tensioner is installed and then it's bulletproof.

Saying you have 4 Al cases is an apples to oranges argument. On the bird board classifieds they have an asking price of $2k and then you need squirters and the oiling mod.
My 3.0 had no broken studs, but I'll be replacing them anyways.

[Cap'n Krusty]

[quote name='Mark Henry' date='Aug 29 2010, 12:46 PM' post='1363069']



I would never use collars on tensioners. If the tensioner fails you don't have any warning like you do with a slowly failing oil fed ten. The collar starts getting hammered on, breaks and the chain goes slack. At best you'll then go buy a bunch of valves. Pick your poison.
[/quote]



Saying you have 4 Al cases is an apples to oranges argument. On the bird board classifieds they have an asking price of $2k and then you need squirters and the oiling mod.
My 3.0 had no broken studs, but I'll be replacing them anyways.
[/quote]

I've been using collars for 30+ years, and 912 valve spring retainers before that, and I've never had a chain related failure on any engine on which they've been used. Ever.

As for the "asking price" for those cases, I had ads all over the place for both plain cases and core long blocks, at a price lower than that, and I don't think I got more than 2 or 3 replies during the several months I was actively trying to sell them. I finally decided to hold onto the stuff.

The Cap'n