Need some help with the ID of engine parts.

This is a B20 block, Part number 496912; Serial number 32478; and down in front of the distributor we have the raised lettering " 1-419303"

The head has a large raised number 3 on the distributor side.

Crank is stamped on the front counter weight with an A and a E
The cam is stamped up front with "D2", near the middle: raised lettering "OBT 10", and near the rear raised lettering "Made in USA".

1) What is it that I have here?

I need to add manifolds and carbs, I plan on using a pair of remanufactured SU HS-6.
I live in Denver, so I will be driving this a 5,000-ft with trips though the mountains up to 10,000-ft.

2) Any suggestions on how to match the jetting of the SU carbs with the cam, head and driviing altitude ??

Thanks for the info guys.
I seem to have the B head as it does not have the injector ports.

I can help you with the engine block id. I have a chart that I copied from an old volvo parts book when I worked at a Volvo dealership.

Engine no: 496912 is a b20b with 118 sae bhp. It would have originaly been in a p1800 with a manual transmission. By logical deduction the year would have to be 1969. Sorry can't help with the head unless it is the original. The cam must have been replaced if it says "made in usa".

I used to have a 62 PV544 with that same engine installed and I used the su's.
I believe I had KD needles in it and it ran great. Of course I was at sea level
aka Florida. Hope this helps.

Cheers, Jim.

The cam billet was made in USA, as they were and still are to this day. It could very well be a Volvo cam.

I said NM! (no message!)

I've noticed a manufacture date cast into all 3 B20's I have around (two complete engines and a bare block). It is just above the oil pan flange, and the right hand side underneath the oil pressure fitting. Hard to see if an exhaust manifold and down pipe is fitted.

Usually the cam is stamped with a letter on the 'back' end of the cam - opposite the gear. I don't think that there is much of apattern to the numbers cast into the crank - I think all the different types come from similar cast blanks, and the grinding turns it into a particular type which is often stamped in the end.

The bottoms ends are reall the same, as much as matters, between B20B and B20E motors. Later on they changed the rod bearing specs (presaging the B21's bottom end by a couple of years) - those are distinguishable from the earlier ones by the number of bolts holding the crank on - 6 for early and 8 for late.

The heads are different, though. A B20B will not have any injector ports in the intake tracts, but B20E and B20F heads will. To distinguish between an E and an F head (the E is higher compression, and a bit more power), look at the middle head bolt on the manifold side of the head. If the machined surface stands separate from other machined surfaces, it is an E head. If it is connected to one of the adjoining injector mounts it is an early F head, if connected to both injector mounts it is a late F head. There is little difference in the stock performance of either F head, but those who know (i.e. John Parker) says the late F heads can be modified for more performance than any of the other styles (watch out for core shift though!).
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I'm JohnMc, and I approved this message.