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Guru

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428 Pontiac


I found an old Bonneville for sale cheap, supposed to have a 428. I have only seen a few of those, I think made maybe 2 years. Does anyone know anything about that engine? I'm guessing it's a shorter stroke 455. Mught be a fun drivetrain to drop in an old pickup or something.

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Moderator

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Supposed to be a real torque monster!!! Is the car worth fixing? Old pontiacs are cool!!,,,CR

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Guru

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I'm heading out to take a look at it today.

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Guru

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421 and 428 motors were the best pontiac ever made. IMO the 455 cant hold a candle to them.

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i had one. it ran dang good for a led sled. out ran my 66 fairlane with a 390 in the 1/4 mile.plenty power down low.

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Administrator

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Here are the Specs on them Pontiac Engines smile


 

Pontiac V8 Displacements

Year

Displacement

Bore in inches

Stroke in inches

Mains in inches

1955

287

3.75 3.25 2.50
1956

317

3.9375 3.25 2.50
1957

347

3.9375 3.5625 2.623
1958

370

4.0625 3.5625 2.623
1959-'66

389

4.0625 3.75 3.00
1963-'66

421

4.09375 4.00 3.25
1963-'67

326

3.720 3.75 3.00
1967-'69

428

4.120 4.00 3.25
1967-'79

400

4.120 3.75 3.00
1968-'77

350

3.880 3.75 3.00
1970-'76

455

4.150 4.21 3.25
1977-'81

301

4.00 3.00 3.00




I helped a Friend Rebuild a 1969 428 4-bbl for His Bonneville . He just did a Stock rebuild no Boring was needed . Sure it made good Power But had Like 10.75.1 C/R so it rattled real Good with out Premium Fuel .

Just about 100% of them 428's had 4-bbl's and C/R's up over 10.1 with Giant Sized Valves Bigger then other BB Brands . So they where making 360-390 H.P Stock .

Now if you Look at the Factory 455's they had one High C/R one with D-Port Heads in 1970 .  If I remember Right it was 370 H.P but had more Low end Torque then the 428's .

All them 389-455's are great Engines Not to Heavy or Large in outer Block Size . Also Fairly Cheap to Build over the other Non-Chevy G.M's

But Like any Engine they have a Weak Point . That Being the Cast Iron Rods on all them Non-Round Port Pontiac Engines .

If they are Built under 450 H.P and not over rev-ed they can Live a Long Life in a Hot Rod . If I had a Pontiac 428 Laying on My Garage Floor . I would give it a Go in My Monte Carlo nod.gif

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Guru

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421's and 428's are also externally bigger

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The 326-455's are the same outward size . The 265-301's are smaller Blocks .

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I had one of those back in the early 80's. I pulled the motor and tranny and wedged it into a 75 Dodge Pickup.. That thing would pass everything on the road, except for a gas station. Damn, I miss that truck.....cry

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