[JSuchma]

Those are not true 70 RAIII manifolds. The 1970s had only 3 head flange bolt holes per side. That was the only year for this arrangement; all previous ones had 5 holes per side. Never heard of the 4 hole flanges.

[skunkwerks]

Originally Posted by JSuchma

Those are not true 70 RAIII manifolds. The 1970s had only 3 head flange bolt holes per side. That was the only year for this arrangement; all previous ones had 5 holes per side. Never heard of the 4 hole flanges.

You thinking of round port bolt pattern for the 3? Original Round ports were 3. 4 hole for the D ports if I am not mistaken.

[JSuchma]

Originally Posted by skunkwerks

You thinking of round port bolt pattern for the 3? Original Round ports were 3. 4 hole for the D ports if I am not mistaken.

I just sold a pair of NOS 1970 RAIII D-port A/F body manifolds to a PY member recently. They both had 3 holes per side. All repops have 5 holes per side.