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What's the difference
- Thread starter chrisg01
- Start date
it seems that there are two 85 blocks from what i can gather early ones had a 14 bolt pan and later ones had a 20 bolt pan later 85's had powermaster brakes and from what i can gather they were the cars that got the 20 bolt blocks put please note they were not 109 blocks i cannot remember exactly but i think the block number was ---140What's the difference between a turbo 3.8 1985 block and a carbureted 3.8 1985 block will a carbureted engine block work with the turbo components
with a little extra work it will workMy reason for wanting to know is my turbo motor is bad and I have a buddy that has an85 carbureted motor and I thought if it would work I'd put all the turbo stuff on it and use it
- Joined
- May 26, 2001
What's the difference between a turbo 3.8 1985 block and a carbureted 3.8 1985 block will a carbureted engine block work with the turbo components
Simple answer is "yes"!
The difference between a 1985 carb and turbo 3.8 engine is pistons, crank and cam, and actually you could use the crank from a carb engine.
Pistons and cam will function, but may not last long or provide good performance in a turbo application?
Also, be aware the oil pan has a baffle in the turbo application, and the carb does not.
sounds kinda cheap to me .......Summit is a good source for some things but you might want to check with some of the specialized turbo buick vendors that frequent this board-------if you are planning this "switch" you might need the help of someone with experience with these cars or you might not be very pleased with what you end up withSummit racing has rebuild kit with forged pistons and rods and complete bearing and gasket set for 529 bucks
gunzandgearz
gearzandgunz
- Joined
- Aug 24, 2015
For suresounds kinda cheap to me .......Summit is a good source for some things but you might want to check with some of the specialized turbo buick vendors that frequent this board-------if you are planning this "switch" you might need the help of someone with experience with these cars or you might not be very pleased with what you end up with
never seen forged pistons and or rods that cheap and i have seen and used lots of sealed power parts over the years thats cheap even for cast partsIt's a kit by sealed power a division of federal mogul but o thought of going with some of Evers proficts
View media item 71 this is the kit I was talking bout
turbofabricator
Well-Known Member
- Joined
- Mar 7, 2004
These days with Chinese parts being made for everything, it may be forged. Mr. Sum Ting Wong works for $.38 /hr pumping out pistons for CHEAP!! Cast factory pistons are nice pieces. They are very heavy, but we shift at 5,500 rpm with most cars, so they are just fine. If you spin it past 6K then a forged piston is needed.
Carbed cast pistons do not have a metal top ring land cast into them, and will NOT last long with a turbo. The carbed 3.8 rods are the same, except for rod bolts. The turbo engines had SPS rod bolts, which are much stronger. The block is fine, no matter which version you use. No gain using a 109 block over any other 3.8/4.1 block.
Carbed cast pistons do not have a metal top ring land cast into them, and will NOT last long with a turbo. The carbed 3.8 rods are the same, except for rod bolts. The turbo engines had SPS rod bolts, which are much stronger. The block is fine, no matter which version you use. No gain using a 109 block over any other 3.8/4.1 block.
