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The Buick straight-8 engine (Fireball 8) was a straight-eight cylinder automobile engine produced from 1931 to 1953 by the Buick division of General Motors. It replaced the Buick Straight-6 engine across the board in all models on its debut.
Design
Unlike most other car makers at the time, Buick had been using a valve-in-head/OHV overhead valve reverse-flow cylinder head design or I-head since their inception and continued this practice in their straight-eight designs. The engine was sold in different displacements depending on the model of car and the year and was constructed upon two distinct (possibly more) block castings. The engine block in the smaller displacement versions internally resembled the 1937-53 inline Chevrolet 216, 235 & 261" straight six (the combustion chamber design was quite different), albeit with additional cylinders. The large block version (320 cid and 345 cid; used in large-chassis models such as the Roadmaster) was considerably heavier and this weight adversely affected vehicle performance and handling. In earlier years the engines used cast-in-place bearings that were then machined, which made engine rebuilding an expensive procedure, but after 1937 they began using drop-in bearings.
Initial compression ratio varied between 4.5:1 and 4.75:1 in different engines, with 77 bhp (57 kW), 90 bhp (67 kW) and 104 bhp (78 kW) for 221, 273 and 345 engines respectively; when the 320 engine was introduced, it produced 120 bhp (89 kW), increasing to 170 bhp (130 kW) later.
The last year for Buick's straight-eight was 1953, but only in the lower-cost Buick Special. All other lines using the same basic chassis received the new V8 322 cu in (5.3 L) Fireball. Starting in 1954, the Special received the V8 as well.
1952 Production Engines and Ratings
See also
Buick V8 engine
Buick V6 engine
Buick Straight-6 engine
List of GM engines
References
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Hi-Performance Straight Eights - Buick - Discussion Forums
02 Jun 2016 · 8. It was a Ronco, Vertex, Scintilla, magneto. It is now being reproduced for the traditional rods in a HEI form and adverised in the hot rod magazines.I dont think they have a Straight 8 Buick one but the Pontiac HEI is almost a clone of the old Buick distributor, [cept the pontiac rotates opposite way]
Buick straight 8 for straight 8 engine swap - Buick - Pre War
07 Jan 2021 · I've got a '37 Buick 46S Sport Coupe with a 248 straight 8, likely original to the car. There is some serious internal problem going on. Engine turned and started five years ago but there is problem deep in the engine - crankshaft, rods, piston - who knows? Car has been held hostage due to a long...
Straight 8 NEED HELP Identifying year and size - Buick - Post …
29 Des 2005 · If the straight 8 engine is attached to a Dynaflow, that means it has to be a 1948 to 1953 engine. If the exhaust manifold is in three sections (front, center, rear) then it is probably a 320 cubic inch, or "large" engine, from a Roadmaster.
Identifying a Straight 8 - Buick - General - Discussion Forums
29 Feb 2012 · The 1934 Series 40 was an all new car and fitted with a newly designed engine while the bigger Series cars continued on with the same engine design as introduced in 1931 ( until 1936 ). The power to weight ratio meant the Series 40 could outrun ALL other 1934/35 Buick models and is credited as saving Buick from closure.
Engine number from Buick Straight 8 - Buick - Post War - Antique ...
04 Jan 2021 · Buick Straight 8 engine numbers have a pattern and that pattern changed in the 40's (I think). On the early engines the first number was hand stamped and represented the model of the car. A 4 for Special, a 6 for Century, a 8 for Roadmaster and a 9 for Limited.
For Sale 1941 Buick straight 8 engine & transmission
30 Jun 2022 · Hi, up for consideration is a 248 Buick engine and 5-bolt transmission. dual intake with 2 stromberg aerotype carburetors and air cleaner. starter, distributor and flywheel. no clutch or pressure plate. this was from the PO’s running coupe and it was destined for the convertible. It turns over sm...
Engine Stand for Buick Straight 8 - Buick - Pre War - Antique ...
27 Feb 2017 · What experiences exist for engine stand use with a Buick straight 8, specifically the big 320? A couple things come to mind. 1) Will the engine block at the point it is bolted to the engine stand support the weight of the engine without breaking the engine? I know from other peoples unfortunate e...
What to do to a Buick Straight Eight to make it LAST, and LAST
25 Jan 2016 · As noted, the oil filtration system would need to be "full-flow", too. With the more precise and computerized engine machining of modern times, better synthetic oils, better oil filters, and total engine "sealing" from outside environmental situations, this improved Buick I-8 should "last forever" with 5000K mile oil and filter changes.
Straight 8 Engine Id - Antique Automobile Club of America
09 Mar 2010 · Buick - General - AACA Forums is the best place for Buick questions. Is a 248ci or 320ci ? 248's have 3 bolts on the carb:- 320 have 4 bolts. Look at Team Buick. Possibly 1948 series 70. Edited March 9, 2010 by 1939_buick (see edit history)
Weird Straight 8 Problem - Buick - General - Discussion Forums
16 Mei 2014 · The flywheel will mount in any position on the straight eight, all old motor repair manuals tell you to mark the location before removing. The 48 is different but will work in a 41 by changing the front mounting plate. The 48 and later mounts are near the center of the engine. I think the hydraulic lifters were in the automatic not stick.