murrayarnold Posted August 12, 2019 Report Share Posted August 12, 2019 Good day guys. I am doing a carb conversion. I have noted that the inlet manifold bolt sizes differ. The top 3 are i think, 8mm and the bottom 3, 10mm. Is this normal or has my head been modified. Also are they metric or imperial? Thanks. Quote Link to post Share on other sites
Waldi Posted August 12, 2019 Report Share Posted August 12, 2019 Arnold, They should not be metric, they are UNF, 2 sizes, I think 5/16” and 3/8”. Also, they should be studs with a nut, not bolts. Maybe someone replaced them and tapped new threads in the head? Metric is coarser than UNF. Waldi Quote Link to post Share on other sites
murrayarnold Posted August 12, 2019 Author Report Share Posted August 12, 2019 Thank you sir. Appreciated. I only have allan bolts for mine. Hmm. I will take a better look in the morning. Its ti bloody humid to work. Wish i had an air conditioned garage. Thanks for that. Quote Link to post Share on other sites
JochemsTR Posted August 12, 2019 Report Share Posted August 12, 2019 6 x 3/8 UNF Long (clamps) 4 x 3/8 UNF Short (exhaust) 3 x 5/16 UNF (middle) Quote Link to post Share on other sites
RogerH Posted August 12, 2019 Report Share Posted August 12, 2019 It has been known for owners to replace the studs with Allen screws as it may be easier to fit them Roger Quote Link to post Share on other sites
murrayarnold Posted August 12, 2019 Author Report Share Posted August 12, 2019 The bottom 3 for sure are easier. I even drilled an access hole through the inlet outer flange to get access with a ling alan key. Worked a charm Quote Link to post Share on other sites
Waldi Posted August 12, 2019 Report Share Posted August 12, 2019 Hi Arnold, can’t help you with the airco:) Typically, metric bolts are stamped 8.8 or 10.9 or 4.6 or similar. UNF bolts have a “stripe-system” 3stripes equals 8.8 quality. Waldi Quote Link to post Share on other sites
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