Turbo Kit for Cadillac DeVille Eldorado Fleetwood (1968-1981) 7.0L 7.7L 8.2L

Complete twin-turbo intercooled package for Cadillac big-block engines — 425 / 472 / 500 ci (about 7.0L / 7.7L / 8.2L) used in DeVille, Eldorado and Fleetwood (1968–1981). It pairs two stainless tubular manifolds with two T4 turbos, a front-mount intercooler, dual oiling kits, boost controller, blow-off valve, turbo timer, battery relocation and fuel-system parts in one box. On a stock motor, plan on a low-boost street tune around 8–10 psi. The 1200 hp figure is a twin hardware ceiling with a built engine and supporting mods, not a dyno result for a stock Cadillac.

Why this kit

• Twin T4 turbos with large 4" / 2.5" compressor housings
• 321 stainless tubular manifolds with large 2.25" primaries
• Dual oiling kits, front-mount intercooler and battery relocation
• Boost controller, blow-off valve, turbo timer and fuel regulator included

Package Includes

• (2) T4 turbochargers with oil fitting gaskets and mounting studs
• (2) TIG-welded 321 stainless tubular turbo manifolds, 2.25" primaries, ported and polished, with gaskets
• (1) Front-mount aluminum intercooler
• (1) Aluminum intercooler piping kit: (2) 2.5" straight pipes, (2) 90°, (2) 60°, (2) 45° bends, (2) 2.5" 90° silicone couplers, (6) 2.5" straight silicone couplers, (16) stainless worm-gear clamps
• (2) Turbo oil line kits: high-strength feed lines, high-temp 550 psi returns, fittings, gaskets and hardware
• (1) Manual boost controller with install kit
• (1) Blow-off valve kit with install kit
• (1) Battery relocation kit, full aluminum, cables, straps and hardware
• (1) Slim reversible cooling fan
• (1) Electronic turbo timer with LED display and wiring
• (1) Adjustable fuel pressure regulator with gauge plus -6AN billet aluminum fuel filter
• (1) Oil catch can with install kit
• (1) Coolant bung
• (1) Heat wrap roll
• (2) 2.5" stainless adapters (mandrel bent, O2 bung where equipped)

Turbocharger Specs

• Type: T4 each, wet-float bearings, balanced
• Compressor: 4" inlet, 2.5" outlet
• Oil inlet: 1/8" NPT
• Hardware ceiling about 1200 hp in pairs with a built engine and supporting mods — not a stock-car dyno result. Plan on 8–10 psi on a healthy stock engine with a proper tune

Exact Fitment — Cadillac DeVille Eldorado Fleetwood

• 1968–1981 Cadillac DeVille, Eldorado and Fleetwood with 425, 472 or 500 ci big-block V8 (about 7.0L / 7.7L / 8.2L)
• Confirm head flange and accessory clearance during mock-up — big-block Cadillac chassis vary by year
• Chassis-specific downpipes and exhaust beyond the turbo flanges are not included
• Intercooler piping is universal and needs cutting and fitting per chassis

Not Included

• Chassis-specific downpipes and exhaust beyond the turbo flanges
• Separate external wastegate kits (not listed in this package — plan boost control strategy during install)
• Larger injectors, fuel pump and ECU / ignition tune (required)
• Clutch or transmission upgrade, boost gauge and wideband
• Oil-pan return bung if your setup needs one

Installation Notes

• Professional installation strongly recommended. Expect cutting and fitting of the universal piping
• The manifolds are stainless tubular with large primaries for big-block Cadillac heads
• Oil return must drain by gravity on both turbos; prime each turbo with oil before first start and check for leaks
• Blow-off valve flanges are installed at your discretion
• Keep boost near 8–10 psi until fuel and tune are upgraded, and let the turbo timer handle cool-down

FAQs

Which engines? Cadillac 425, 472 and 500 ci big-blocks (about 7.0L / 7.7L / 8.2L) in DeVille, Eldorado and Fleetwood through the listed years.

How much power will it make? A healthy stock engine at about 8–10 psi with a proper tune is the street baseline. 1200 hp is a twin hardware ceiling with a built engine and full supporting mods.

Is it plug-and-play? No. You still need injectors, a fuel pump, a tune, downpipes and some pipe fitting.