My phone is being tempermental, and won't add a link.
On ebay, search for, land rover discovery bosch fuel injectors.
You'll get several choices, with good returns and extended warranties.
I saw $65, $80, and $90 a set, depending on seller.

 

I found some $64.99 shipped warrantied and tested. I feel much better about this than remanning them myself.

 

The bolts are 6 point not 12 point. I was confusing them with the Exhaust manifold bolts

 

I am guessing I should not use an impact wrench on the head bolts. This will break the bolts, possibly damage the block?

 

 

Yeah, not worth trying to recondition injectors yourself. I tried, and failed miserably. Either replace pintle caps, filter basket, and o-rings for maintenance, or get a reman set if yours aren't working. The price new is crazy, like $90 a pop.

I'd use a breaker bar on the head bolts, they're not that difficult.

 

There are some Ford fuel injectors that i was reading about that supposedly improve performance, also similar in price to rebuilt LR injectors. Higher flow.

might be worth looking up.

 

 

If the block was iron, I wouldn't be concerned about an impact on head bolts.
With a steel bolt in an aluminum block and threads, I would not use an impact.
The steel will gall and bind in the aluminum without anti-sieze. If you spin the bolt quickly with an impact, you run the risk of pulling threads out with the bolt.
Where as with a breaker bar, breaking it loose slowly gives the threads more chance to break free from each other.