Mmmm, sounds like a bit of a hotch-potch. Steel sumps were used on Holbays, ally only fitted to all early models originally. AM3 not 100% fool-proof on indicating Holbay head. I have seen it on std's although most AM2 with occasional AM4 (late ones). Rocker covers interchangeable, so no proof it's a Holbay head from that. What manifold has it got on it? If running strombergs on std manifold then I'd say likely it was std head. What about exhaust manifold? Std too? I'd say you might just have a std head? More thoughts from others I'm sure
Hi all, is there any chance a Hillman Hunter 1500 engine would run with a Holbay head fitted, picked a full engine up Monday but its got the AM3 Holbay head,Holbay rocker cover,but steel sump only bought for the conrods and block so slightly confused, its got stomberg carbs fitted and no vacuum on dizzy ?