Was woundering what makes a Tri Five a Factory Power Pack setup. Iv heard a few different things and want to clarify
Thanks
Shawn
Thanks
Shawn
What makes a car a Power Pack
SNTAuto
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No valve pic?Shawn.....In 1955 Chevrolet named the 265 “Turbo-Fire”, it was rated at 162 horsepower with a two-barrel carburetor and had a 8.0:1 compression ratio. A “Power-Pack” version, which Chevy called the “Super Turbo-Fire” was added during the 1955 production year as an option. The “Power-Pack” version had 180 horsepower. The increased horsepower was due to a Rochester 4 barrel carburetor and duel exhaust. A third V-8 was offered later for racing and its horsepower was boosted to 195 with the use of a Corvette camshaft and valve springs.
I believe 1956 was the was the first year the 265 Power Pack motors were equipped with a Power Pack head that featured 58-cc chambers and 1.72/1.50-inch valves that looked like this:
![Image]()
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306 is for 56 only, small intake and exhaust ports. Early 56 Corvettes came with them with dual quads on the first production. Later dual quad passenger and Corvettes with dual quads used 762 castings, with larger intake and exhaust ports and ram horn exhaust manifolds similar to the 57 and later. The 57 used 539 powerpack head on 220HP passenger car and 283HP fuel injected engines, both passenger and Corvette, with lightened valves for higher RPM.
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