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Looking at possibly buying a 35 Pontiac Coach. Engine is a flathead 6. Can anyone tell me the displacement, horsepower etc. Also where would I find parts for this engine. Owner says the engine might be stuck. He has never had it running. Any help would be greatly appreciated.
Weeds
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In 1935 Pontiac introduced a 208 cid flathead six producing 80 horsepower and continued that same engine through 1936. (In 1937, displacement increased to 223 cid.)
208.0 cid
80hp @3600rpm
150 ft/lbs torque @1600 rpm
6.2:1 compression ratio
Carter W-1 carburetor
As i recall, somebody ran one of these engines in a "lakester" at the dry lakes and at Bonneville in the early 1950s, so they could be made to run hard. Unlike many engines of that time, this design has full-pressure oiling to the crankshaft and inserts in main and rod bearings.
Contact with the Pontiac-Oakland Club International and the advertising in Hemmings Motor News would be useful places to begin to look for parts.
God's Peace to you.
d
Inliner #1450
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AFAIK, the engine was made through 1954 as 239" with some changes.
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Panic and Don1450, thanks for the replies, does anyone know if the later 239 will bolt in?
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Panic and Don1450, thanks for the replies, does anyone know if the later 239 will bolt in? '52 Hollander interchange shows 3 different numbers and three different date ranges (heads vs. blocks): Years.......Displacement.......Hollander Head#...Years Block # 1935-36.......208........................255.........35-36......10 1937-40.......222.7......................332.........37-48.....194 1941-51.......239.2......................363.........49-51.....211 Heads apparently all interchange (Hollander Note on 255: Fit #332 by drilling hole for heat indicator; Note on 363: bolt holes line up with 332 and gaskets fit). So if your head is good you could use it on a later block. I don't know the differences between the three blocks - Hollander provides no interchange notes - so if the motor mounting arrangement changed you may need more from the donor car then just the block. But if the owner has gone v-thingie they won't need the frame mounts anyway . . . regards, stock49
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Does anyone know the piston height for a Pontiac Six piston? I have a set of Toyota 2F pistons that I'm hoping will fit my mate's '51 Pontiac, 95mm bore, 0.990" pin. From what I see in this article they could work, and by using the earlier Pontiac rods the stroke could be altered to compensate for different piston height if it's within 0.125". 2F rods might also work, although they're very long.  
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It's now Marron and won 1st place in it's class at Pebble Beach..
216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later
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Thank you all for the replies. If I can't get this thing unstuck I will be looking to swap in a later engine. As I understand it any Pontiac flathead 6 up to 54 can be swapped in. Is this correct? I would really like to talk to someone who has done this. Probably too much engine but maybe even a later Sprint OHC 250. I have a small but pretty well equipped machine shop and can fab just about anything I need. I am not looking to build a street rod just a dependable cruiser. I will do brakes, wheels, tires and drive it as is. Again thanks for all the replies.
Weeds
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Thank you all for the replies. If I can't get this thing unstuck I will be looking to swap in a later engine. As I understand it any Pontiac flathead 6 up to 54 can be swapped in. Is this correct? I would really like to talk to someone who has done this. Probably too much engine but maybe even a later Sprint OHC 250. I have a small but pretty well equipped machine shop and can fab just about anything I need. I am not looking to build a street rod just a dependable cruiser. I will do brakes, wheels, tires and drive it as is. Again thanks for all the replies.
Weeds I think you will have to find a BOP specialist to know for sure what years will interchange easily - motor mounts could have changed from year to year - leading to something less then a bolt in swap . . . I like your "original configuration" cruiser idea. Not sure if you noticed the Edmund's dual out on ebay: Eddie Edmunds for Flathead Pontiac A bit on the pricey side but would add to the ooh and ahh factor when parking between cruises . . . regards, stock49
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Stock49, thanks for the reply. I am a little behind the times. What is a BOP specialist?
Weeds
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BUICK, OLDSMOBILE, PONTIAC.
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I have a 1938 Pontiac 4 door , survivor, When an errant rod from the flathead 6 went through the crankcase. I swapped in a OHC 6 Sprint from a 1968 Firebird, backed up with 200 4R Buick (BOP), Nice fit! Came up a little short for an engine mounted fan. Car remains essentially stock (but 12V, 605 PS box). I like it but would like better brakes without major suspension mods. Fellow NNVI inliner has OHC 6 in a 50's GMC. Have not torn down the flathead to see why it failed. Externals suggest the engine was attended to during resto by PO. Am disposing of items from my "pull" but useable engine items not yet sold. I Have photos of Sprint swap if interested,
'49 Chev Styleline
'38 Pontiac, SOHC 6 "Sprint"
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