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The Ram Air IV used the Ram Air II's camshaft but lift in the Ram Air IV was increased to 0.52 in (13 mm) thanks to the use of 1.65 ratio rocker arms (vs 1.50). The Ram Air IV heads had 1/8" taller intake ports, larger intake port volume with more airflow, yet shared the Ram Air II round exhaust ports.
There was an additional Ram Air IV option for the 400 cu in (6.6 L) V8 engines during 1969, complementing the Ram Air 400(now often colloquially but incorrectly called the "Ram Air III," a name never used by Pontiac). The Ram Air IV was rated at 345 hp (350 PS; 257 kW) at 5000 rpm and 430 lb⋅ft (583 N⋅m) of torque at 3400 rpm; [11] and 335 ...
The 1970 Pontiac GTO Judge Ram Air IV Convertible sold for $1.1 million at Mecum Auctions thanks to its rarity — Pontiac only made seven automatic versions. Originally a factory exhibition car ...
There were two Ram Air 400 cu in (6.6 L) engines available for the 1970 Trans Am: the 335 hp (250 kW) L74 Ram Air III 400 (366 hp (273 kW) in the GTO) and the 345 hp (257 kW) L67 Ram Air IV (370 hp (280 kW) in the GTO) that were carried over from 1969. The Ram Air IV was exclusive to the Trans Am, and could not be ordered on any of the lower ...
The "Ram Air" and Ram Air IV engines did not return for 1971. The standard GTO engine was the 400 cu in (6.6 L) V8, but now with 8.2:1 compression ratio. Power was rated at 300 hp (220 kW) SAE gross at 4,800 rpm and torque at 400 lb⋅ft (542 N⋅m) at 3,600 rpm.
1905–1914 Cadillac Model D side-valve (acquired as part of the founding of GM); 1906–1923 Oldsmobile Model S side-valve (acquired as part of the founding of GM); 1906–1911 Buick Model D inline-4 [10] (T-head design, the only non-OHV Buick engine ever made) [11]
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These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons. They were called Polyspheric or Poly engines, because they featured polyspherical-shaped (meaning "more than one sphere") combustion chambers. These were formed by two ...
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