cooliomo
Active member
are the 6 bolt head and 7 bolt heads, different? if so how can i tell the difference. i searched.
The Top Mitsubishi Galant VR-4 Resource
Join the best E39A 1991-1992 Mitsubishi Galant VR-4 community and document your GVR4 journey.
- Software Upgraded - Reset Your Password to Login
In order to log in after the forum software change, you need to reset your password. If you don't have access to the email address you used to register your GVR4.org account, you won't be able to reset your password. In that case, follow the instructions here to regain access to the forum.
head difference
- Thread startercooliomo
- Start date
solidviper89
Well-known member
I don't know specifics... But 6bolt heads have bigger ports(higher flow)
2g 7bolt heads have better angle into cylinder(?), smaller port makes higher velocity, makes more torque...
I have zero first hand experience, this is just from things I have read. Dsmtuner's has a few threads on the differences; i'm sure someone with actual knowledge can chime in.
2g 7bolt heads have better angle into cylinder(?), smaller port makes higher velocity, makes more torque...
I have zero first hand experience, this is just from things I have read. Dsmtuner's has a few threads on the differences; i'm sure someone with actual knowledge can chime in.
Barnes
Well-known member
SV, I think you are confusing a 7-bolt head with a 2g head. 7-bolt heads have the same ports as 6-bolt heads. 2g heads have the smaller ports which are generally better, or people use 2g heads as cores because you can do a raised runner style and get a better angle into the valve.
The differences I can think of are A)Small head bolt holes and B)The far left and right exhaust manifold studs are 10mm instead of 8mm. You can use a 7-bolt head on a 6-bolt engine IF you have the head bolt holes bored out to accommodate the larger 6-bolt head bolts or studs.
The differences I can think of are A)Small head bolt holes and B)The far left and right exhaust manifold studs are 10mm instead of 8mm. You can use a 7-bolt head on a 6-bolt engine IF you have the head bolt holes bored out to accommodate the larger 6-bolt head bolts or studs.
solidviper89
Well-known member
Yea I meant that... the 7bolt head that came on 2g's /ubbthreads/images/graemlins/smile.gif 95+ /ubbthreads/images/graemlins/smile.gif
I know that some 1g's got the 7bolt, but i always remember it as 2g dsm's have the 7bolt.
I know that some 1g's got the 7bolt, but i always remember it as 2g dsm's have the 7bolt.
cooliomo
Active member
ok thanks i guys i really appreciate it!
TRBODSM
Well-known member
The 1G 7bolts have the two 10mm studs on the bottom ends also.
fuel
Well-known member
Lancer Evo 1, which is a 7 bolt engine has the smaller ports too. They were around in 1992.
