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Thread sizes
Posted: Fri Feb 11, 2011 9:19 pm
by Blackflag533
Evening all,
Whats the thread size in the cylinder head for the inlet & exhaust manifolds on a 3.9 Rover V8...?
I'm in need of a helicoil or 5...!
Thanks in advance.
Re: Thread sizes
Posted: Fri Feb 11, 2011 9:22 pm
by DEVONMAN
Blackflag533 wrote:Evening all,
Whats the thread size in the cylinder head for the inlet & exhaust manifolds on a 3.9 Rover V8...?
I'm in need of a helicoil or 5...!
Thanks in advance.
3/8 unc for the exhaust and I think the inlet is the same
Regards Denis
Re: Thread sizes
Posted: Fri Feb 11, 2011 9:26 pm
by Blackflag533
DEVONMAN wrote:Blackflag533 wrote:Evening all,
Whats the thread size in the cylinder head for the inlet & exhaust manifolds on a 3.9 Rover V8...?
I'm in need of a helicoil or 5...!
Thanks in advance.
3/8 unc for the exhaust and I think the inlet is the same
Regards Denis
Hello Denis,
That was quick!!
Thanks very much.
Posted: Fri Feb 11, 2011 10:56 pm
by spend
They are both 3/8 UNC.
Typically there is enough depth of thread in the heads to use longer studs / bolts on the exhaust if you clean/tap them out. The inlet is of course at an obtuse angle so you have to be really careful running a tap down them but I'm pretty sure there is quite a bit of room in them to use 1/4" longer bolts as well.