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92sclikenew
04-29-2009, 07:14 PM
ok my dad has a 3.8 n/a bird

well i have a set of my sc heads and offered them to him to install on the car since he thinks he has a cracked head.

anyways i told him i know they will bolt on. he is worried about the heads causing his motor to have lower compression since the heads might have a different design.

thanks!

scxr7
04-29-2009, 07:18 PM
Don't worry..the heads are the same..the only difference is the s/c heads have better coolant passages. The head bolts are the same, the head gaskets are the same. You can basically put any 3.8 head onto any 3.8 block and it will work..

the combustion chambers of the n.a and s/c heads are the same.

92sclikenew
04-29-2009, 08:07 PM
Don't worry..the heads are the same..the only difference is the s/c heads have better coolant passages. The head bolts are the same, the head gaskets are the same. You can basically put any 3.8 head onto any 3.8 block and it will work..

the combustion chambers of the n.a and s/c heads are the same.

thanks! dumb short message crap! lol:rolleyes:

91BlackBird
04-29-2009, 08:44 PM
The heads are not the same,you are right about the better cooling and gaskets being similar,but most sc gaskets are specific as are most engine parts.
The ports are bigger on the sc as the heads flow better.
The combustion chambers may be different due to compression differences in the two engines.
3.8L n/a and s/c share almost no parts in common,just because the displacement is the same does not mean they are the same engine.
Differences are:block,crank,rods,pistons,heads,intake,exaust manifolds,timing chain cover etc etc.
The 3.8L heads will bolt to the n/a block but(if the intake lines up)there will definetley be a step down from the factory n/a intake(in the port) to the sc head ports as they will be larger than the intake.

Roadhawg
04-29-2009, 08:55 PM
They will work..................

92sclikenew
04-29-2009, 09:24 PM
so not to say any one is wrong what is right. im sure i seen somewhere some one used sc heads on a n/a block.. i know it is specific for when running boost but am unsure about no boost.

Roadhawg
04-30-2009, 06:25 AM
so not to say any one is wrong what is right. im sure i seen somewhere some one used sc heads on a n/a block.. i know it is specific for when running boost but am unsure about no boost.

I had a set on my 95 NA Mustang block, when I installed them I used SC head gaskets. As SCXR7 stated "the combustion chambers of the n.a and s/c heads are the same. "

92sclikenew
04-30-2009, 07:45 AM
I had a set on my 95 NA Mustang block, when I installed them I used SC head gaskets. As SCXR7 stated "the combustion chambers of the n.a and s/c heads are the same. "

ok i hope so he would be mad to get it together and it run like crap because it has to low of compression.

Roadhawg
04-30-2009, 07:48 AM
ok i hope so he would be mad to get it together and it run like crap because it has to low of compression.

The pistons are the determining factor on compression ratio in this case.

92sclikenew
04-30-2009, 07:50 AM
The pistons are the determining factor on compression ratio in this case.

thanks again!