186S

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Page created by T August 25th 2007:

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Recently restored Holden HG 186S. Click to Enlargen. Photo by Blissy.

186S:

186 Cubic Inches Displacement, 6 cylinders.
Bore 3.625"
All the red sixes have the same 3.00" stroke except the 201, 202 and 3.3 which have a 3.25" stroke. Blue and black 3.3's also have a 3.25" stroke.  These engines were originally fitted to HR Holdens, then HK-T-G. They used adjustable valve gear.

 

HG 186S Throttle Connections. Photo by Blissy. Click to Enlargen.

 

Holden 186S engine. Click to Enlargen. Photo by Blissy.
Holden 173 Engine disembled, typical of all Red 6 Engines. Note the Rockers are Adjustable because it is a 149 Head. Standard 173 Heads use Non-Adjustable Rockers. Image by Bubsy. Click to Enlargen.
Holden 186 engine. Click to Enlargen. Photo by The Red Baron.
Holden 186S engine badge as fitted to HK-T-G Holdens with dual throat Stromberg Carburettors. Click to Enlargen. Photo by Old Holden.

 
Holden 186S engine badge as fitted to HR Holdens with dual throat Stromberg Carburettors. Click to Enlargen. Photo by Old Holden.

 

X2 And 186S Header Part Numbers:


Submitted by 72GTRXU1 on Mon, 07/05/2007 - 12:56. I have been consulting with Dr Terry and others on the Torana forum and this is what we have come up with.
X2 Front 7428493
X2 Rear 7428495
186S 161S
173S LC XU1 Front 7433655
186S 161S
173S LC XU1 Rear 7430583
LJ XU1 Front 7428493
LJ XU1 Rear 7430583
There are 3 front sections: (A) Plain X2 (B) Heat riser drilled and (C)Heat riser Blank. As can be seen, the X2 Front and the LJ XU1 Front have the same Part Number. We assume that the Plain one (A) has been replaced with the Blank heat riser (C).
Any of the 3 different front sections will fit any of the motors including the X2. However where the auto choke is to be used - part number 7433655 (heat riser drilled) must be used. The rear X2 will not fit any other vehicle except the X2 unless a custom engine pipe is fabricated. The X2 rear flange points more downward rather than more rearward.
I hope this helps
72GTRXU1 aka Bazza

186 Identification Chart:


 MODEL  Introduced
mm/yy
 Finished
mm/yy
 Engine prefix  Capacity
CuIn (cc)
 Power
bhp (kw)@rpm
 Torque
ft.lbs.(Nm)@rpm
 Compression
 HR  4/66  1/68  186A  186(3048)  126(94)@4200  181(245)@1600  9.2
 HR  4/66  1/68  186X2  186(3048)  145(108)@4600  184(249)@2200  9.2
 HK  2/68  5/69  186P  186(3048)  126(94)@4200  181(245)@1600  9.2
 HK  2/68  5/69  186S  186(3048)  145(108)@4600  184(249)@2200  9.2
 HT  5/69  7/70  186H  186(3048)  130(97)@4400  181(245)@2000  9.2
 HT  5/69  7/70  186S  186(3048)  145(108)@4600  184(249)@2200  9.2
 HG  7/70  7/71  186H  186(3048)  130(97)@4400  181(245)@2000  9.2
 HG  7/70  7/71  186S  186(3048)  145(108)@4600  184(249)@2200  9.2

 

186 Engine Numbers:

All 186 motors have 186 cast on the block beside the alternator.
The engine number is on a flat tab between the distribuitor and fuel pump.
The engine number will start with 186, then a letter, then six numbers:
186A****** is a standard HR 186 block.
186K****** is an X2 HR 186 block
186S****** is a HR 186S block
186X****** is an LC XU1 186 early block
186P****** is a HK 186 block
186N**** is a super rare Nasco replacement block
Hope this helps.
David

Old is good.

Links:

Bubsy's Shed

Blissy's Shed

Richard Zurawski's Shed

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