Topic

Cylinder head bolts inspection
1 .Retain bolts in fitted order
2. Wash all bolt, wipe dry and lightly oil threads
Cylinder head bolts may be re-used provided they pass one of the following tests.
Test with cylinder head removed
1. Carefully enter head bolts in their original fitted location, DO NOT DROP. Screw each bolt by hand into oil rail.
2. Measure distance from cylinder block face to under bolt head “A” in ilustration:
97 mm or less. Bolt may be re-used.
Over 97 mm. New bolt must be used.
Test with oil rail removed
1. Ensuring cylinder head bolts are in their
original fitted location. Screw each bolt by hand into oil rail.
2. If full length of thread is engaged. Bolt may be re-used.
3. If full length of thread is not engages, measure distance from top face of oil rail to under bo;t head “B” in ilustration:
378 mm or less. bolt may be re-used.
Over 378 mm. New bolt must be used.

A set of 10 Bolts is around £30 here to buy and people tend to scrap the original; set and replace with new

Bryan I agree, but if the early (a little "milage") has been head gasket replacement is not necessary to change the cylinder head bolts.
Many resort to cheaper screws that are poor quality of the original.