1970 Oldsmobile 4-4-2
A-body · New 455ci available. W-30 now on 455. New body styling. Decl... · The W-30 455 — Oldsmobile at peak muscle car performance
Highly Collectible
Production & Overview
Total Production
19,330
Original MSRP
N/A
Assembly Plants
Lansing, MI · Fremont, CA · Arlington, TX
Wheelbase
112 inches
Body Styles
2-Door Hardtop · Convertible · 2-Door Post Coupe
Curb Weight
3,725 lbs
Notable Packages & Production
W-30 Force Air 455 — W-30
3-4x base
3,100
produced
Available Engines
L75 455ci — V8
Standard 455 big block
365 hp
W-30 455ci — V8
W-30 Force Air 455 — most desirable 442 engine
370 hp
Buyer Checklist
⚠ Clone warning: W-30 non-matching loses 55%+. Always verify with cowl tag, engine stamp, and registry before purchase.
Decode cowl tag for W-30 option code
Check engine suffix for W-30 designation
Verify W-30 red plastic inner fenders
Inspect A-body floor pans and frame rails
Check for build sheet under seat
Verify correct Rally wheels and tires
Confirm correct 455 vs 400 (455 was new in 1970)
Road test: 455 W-30 has enormous torque
Check all 1970-specific body trim
Verify rear axle ratio code
Known Problem Areas
W-30 fraud
Missing red inner fenders
Floor pan rust
Engine swaps
Lower body rust
What Drives Value
↑ Increases Value
W-30 455 documented convertible — among rarest 442s
W-30 hardtop with 4-speed and documentation
Numbers-matching 455 standard
Rare color like Sebring Yellow
↓ Decreases Value
W-30 fraud
Non-matching engine
Heavy rust
Missing W-30 specific parts
Restoration Overview
Difficulty
Medium
Parts Availability
Good
Driver Quality Cost
$22,000 – $45,000
Show Quality Cost
$55,000 – $110,000
Key Suppliers
Olds Central · Ground Up SS · OER
Pop Culture & Legacy
The W-30 455 is the pinnacle of Oldsmobile muscle car performance
Final year before emissions strangled the 442
Consistently strong values at Mecum and Barrett-Jackson
Other Oldsmobile 4-4-2 Years