heads

P

Pegleg

New member
got a chance to pick up some 91 4.3 marine heads. Whats the specs on those, and are they worth the trouble.
sy1481
 
Sy-1177

Sy-1177

Turbo Inside
out of curiosity, what are the casting #'s on those? I have a complete 4.3 marine block with 0 miles on it that I want to do something with. I know the heads I have are made by Yamaha and are supposed to be pretty good from what I've been told. Do you have anything else or just the heads?
 
S

smeagol

Active member
Yamaha making heads for a GM 4.3??

I'm skeptical...

I have talked to too many people over the past years about 4.3 engine parts. Never heard of Yamaha making anything.
 
jwaller

jwaller

Evil Genius/SyTy Guru
I think the marine heads are the same but the main caps on the crank are supposed to be nodular iron just like original syty
 
Sy-1177

Sy-1177

Turbo Inside
That is the same casting # i have on mine! Those are supposed to be good flowing and heavy duty heads. I heard from a guy that the casting # for the heads specify that they were made by Yamaha. Weather or not that is true is questionable? Just out of curiousity i pulled a couple more #'s off if anyone can define them. On block: 177N18; 4.3LG; 10066011. It also has purple markings on crank and pink markings on push rods. Heavy duty right? I had the #'s for the crank but i lost it and the oil pan is on right now so i'll have to get that later. But the block is supposed to be an 87-88 because it has the hook up for a manual oil pump on the side. Sound right? Also it is supposed to be oddfire (I think). Any response would greatly help. Can I use this motor for the Sy?
 
Syclone#2960

Syclone#2960

What ever it takes!!
Sy-1177 said:
That is the same casting # i have on mine! Those are supposed to be good flowing and heavy duty heads. I heard from a guy that the casting # for the heads specify that they were made by Yamaha. Weather or not that is true is questionable? Just out of curiousity i pulled a couple more #'s off if anyone can define them. On block: 177N18; 4.3LG; 10066011. It also has purple markings on crank and pink markings on push rods. Heavy duty right? I had the #'s for the crank but i lost it and the oil pan is on right now so i'll have to get that later. But the block is supposed to be an 87-88 because it has the hook up for a manual oil pump on the side. Sound right? Also it is supposed to be oddfire (I think). Any response would greatly help. Can I use this motor for the Sy?
Click to expand...

Anyone have an answer to this cast #10066061? :( :(
________
Alteha19
 
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