Thread: Need help identiying 327 sbc

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3932386 was used for 302, 327 and 350 blocks, 1969 vintage

You're giving us two different suffix codes, HB and HU.

If it's HB, it's a 350 that came with a TH350 transmission, 300 hp, 4-bbl. I don't now what the A, F and X represent. Couldn't find a legend.
HB...1969...350...tur hydro trans...300hp...4bbl...A F X

If it's HU, it's a 350 that came with a Powerglide transmission, 255 hp, 4-bbl.
HU...1969...350...Powerglide...255hp...4bbl...full size

This motor began life as a 1969 350, but it is possible that it is a 327 now, converted over from a 350. All it would take would be a 327 medium journal size crank to fit the 350 main bearing I.D. and 327 pistons. Same rods would work. I have no idea why someone would do that, but hey, different strokes for different folks.

Take off a valve cover and read the head casting number in between the valve springs. Post it here. I'm betting they're either 186 or 187 heads.

At any rate, these heads and valves were designed to operate on leaded fuel to prevent valve recession down into the head. Redline and others make products that mimic the addition of tetraethyl lead without the downside to the environment......

RED LINE® LEAD SUBSTITUTE is a safe and
effective valve seat protection additive which is
designed for use in engines which require the
protection of lead. Tetraethyl lead was originally
designed as an octane enhancer, but it was soon
discovered that the metallic oxides which result from
combustion form a protective coating on valves which
prevent microwelding of the valve seat to the valve
face under high temperature operation. This welding
of the two hot pieces of metal causes the removal of
the softer seat metal and subsequent recession of the
valve into the cylinder head. Wear debris then
contributes to valve stem and valve guide wear. Valve
recession causes poor sealing of the compression
gases, which means loss of power and fuel economy,
poor idle and driveability, and the eventual need for
cylinder head replacement.
Red Line Lead Substitute provides the same valve
seat protection as obtained with lead concentrations in
the range of 0.5 - 3.0 grams per gallon. This is
achieved by using sodium-based chemistry which
forms sodium oxides upon combustion and provides
the same physical protection from welding and
subsequent metal removal as did lead oxides. When
compared to levels of lead present in the leaded
supreme of prior years, Red Line Lead Substitute
provides equivalent protection for valves and none of
the detrimental side effects which can be found with
other additives.

http://www.jegs.com/i/Red+Line+Oil/8...VlsaAo5F8P8HAQ

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