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The '69/'70 "round-port" RA IV engine, a derivative of the '68½ "round-port" RA II engine, was the most exotic high-performance engine ever offered by PMD and factory-installed in a GTO or Firebird. The 1969 version had a slight advantage as the compression ratio was still at 10.75:1 as opposed to 10.5:1 in 1970.
• This GTO Judge features a replacement 400-cubic-inch Ram Air III V-8 with a Muncie M20 four-speed manual transmission and a Safe-T-Track rear axle. • The auction ends on Sunday, April 24 ...
For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. It was the same engine as the '67-'68 400 HO [22] but for 1969 and 1970 it included a driver-selectable outside air induction system on the GTO(it was a separate option on Firebird), with the hood vents opened and closed using a knob ...
The ten horsepower increase over 1968's engines was due to a different cam and the use of the #48 big valve heads, the same head used on the Ram Air 3 400-cubic inch 366 hp (273 kW) engine and the 428-HO engine at 390 hp (291 kW). The 1969 model year would be the last high-performance version of the Pontiac 350.
The Custom S came standard with Pontiac's unique overhead camshaft OHC-6 175 hp 250 in 3 engine. Also available was a 230 hp (170 kW) 265 ft⋅lbf (359 N⋅m) TQ OHC inline 6-cylinder with the "Sprint" package, a 265 hp (198 kW) overhead valve pushrod V8 350 in 3 , and a 330 hp (250 kW) version of the same engine with higher compression and a 4 ...
The GTO was dropped in 1975, along with the Pontiac 350. The Ventura could be optioned with the Buick 350 V8 instead. The Ventura SJ was a new offering for 1975, when the Ventura and other GM compacts were restyled with new rooflines along with improved suspensions shared with the second generation F platform (Camaro/Firebird), plus standard ...
And all hail for the first real muscle car.
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