What is the bore and stroke on a Pontiac 400?
What is the bore and stroke on a Pontiac 400?
With a 4.12-inch bore and a 3.75-inch stroke, Pontiac’s 400 had similar bore and stroke to Chevy’s big-block 396 (even when the Chevy actually displaced 402 cubic inches).
What is the bore on a Pontiac 350?
3.875
Pontiac Blocks- Bore and Stroke
| PONTIAC ENGINE CHART | ||
|---|---|---|
| ENGINE | BORE | |
| 350 CU. IN. | Stock Bore | 3.875 |
| 30 over | 3.905 | |
| 60 over | 3.935 |
What is the bore and stroke of a Pontiac 326 engine?
The 326 was interesting because it was created by Pontiac to fill the gap left by Pontiac pulling the 215ci Buick engine it was offering in the Tempest up until 1963. The first version of the engine had a 3.75″ bore and a 3.78″ stroke which actually had it measuring 336ci.
What is the bore and stroke of a Pontiac 428 engine?
“From there I started playing around with the stroke, and at 3.600 inches we were at 428 ci, which is a legacy Pontiac number….By The Numbers: 428ci Pontiac.
| Bore: | 4.350 inches |
|---|---|
| Stroke: | 3.600 inches |
| Displacement | 428 ci |
| Compression ratio: | 11.48:1 |
| Camshaft: | custom Lunati hydraulic roller |
What is the bore and stroke of a Pontiac 350?
350. In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+7⁄8 in (98.4 mm) bore and 3+3⁄4 in (95.3 mm) stroke for a total displacement of 353.8 cu in (5,798 cc).
How far can you bore a Pontiac 350?
All 350s can safely be bored 0.060-over.
What is the bore and stroke of a 421 Pontiac?
In 1967 the 421 was enlarged to 426.61 cu in (7.0 L) by increasing its bore to 4.12 in (104.6 mm). Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. It retained the 421’s 4 in (101.6 mm) stroke and 3+1⁄4 in (82.6 mm) main journal.
How much horsepower can you get out of a Pontiac 455?
In its introductory model year as the division’s top engine, the round-port 455ci had a gross rating of 335 hp at 4,800 rpm and 480 lb-ft at 3,200 rpm. The 455 H.O. was carried over for 1972 without any major changes, but the gross output rating was dropped in favor of net values.
How much can you bore a Pontiac 400?
Most Pontiac blocks tolerate an overbore of at least 0.030 inch, and possibly up to 0.060 inch or slightly more.
What is the best Pontiac motor?
One of the best ones was the Pontiac 400. Sure, they made 428s and 455s, but the 400 was their go-to muscle car engine for Firebirds and GTOs. To get a 400-inch engine, Pontiac started with their proven 389-inch mill and knocked it out to a 4.12-inch bore with a 3.75-inch stroke.
What was the fastest Pontiac?
The 15 Fastest Cars Pontiac Ever Produced
- 1 2006 Pontiac GTO (175 mph)
- 2 2009 Pontiac G8 GXP (175 mph)
- 3 1998 Pontiac Firebird Trans Am (165 mph)
- 4 1963 Pontiac Tempest Super Duty (163 mph)
- 5 1973 Pontiac Firebird Trans Am 455 Super Duty (130 mph)
- 6 2005 Pontiac Grand Prix GXP (143 mph)
What was Pontiacs most powerful engine?
The rear-drive G8, hailed here at AutoWeek and elsewhere in the wheeled world in its original rear-drive, 361-hp, 6.0-liter V8 form, now has a mighty 415-hp 6.2-liter V8 driving those rear wheels, making it the most powerful Pontiac ever.
What is the bore size of a Pontiac V8 engine?
Pontiac V8 Engine Bore Sizes Cubic Inches Year (s) Bore (inches) Stroke (inches) Main Journal size (inches) 389 1959-66 4.0625 3.750 3.00 400 1967-79 4.120 3.750 3.00 421 1961-66 4.09375 4.000 3.250 428 1967-69 4.120 4.000 3.250
What is the bore and stroke of a Pontiac block?
Pontiac Blocks- Bore and Stroke ENGINE BORE STROKE MAIN DIA. 326 CU. IN. Stock Bore 3.720 3.750 3.00 30 over 3.750 60 over 3.780
What is the bore and stroke of a 455 Pontiac?
For the 455, Pontiac expanded the cylinder bore to 4.152 inches and the stroke to 4.21 inches. The 455 powered the Pontiac GTO and Firebird.
How much horsepower does a Pontiac Pontiac have?
Note the reams of wiring in neatly loomed harnesses. 16. On the dyno at the 2013 AMSOIL Engine Masters Challenge, Throttle’s highly developed Pontiac delivered remarkable power, recording 738 hp and 601 lb-ft of torque. 17.
