What kind of engine block is a 1970 Pontiac?
If the block is stamped with a 350, 400, or 455, it was likely cast in 1969, because GM (as discussed) started stamping the displacement on the block for the 1970 model year. Also, all blocks cast in 1969 and later have the last two digits of the year here as well. So if you see “70” stamped in this area, the block is a 1970.
When did Pontiac stop making the 455 engine?
The 455 wielded massive horsepower, but a new horsepower rating system and tighter emission controls drove the 455’s power lower each year until GM abandoned the engine in 1976.
Where do you find the number 428 on Pontiac engine blocks?
As you look there you may find a pretty simple clue that will end your engine identifying search. On 1968–69 428 blocks you will find “428” stamped between the freeze plugs. On blocks produced in 1970 and after, you will find 350, 400, or 455 stamped towards the left side of the front of the block.
What was the horsepower of a 1973 Pontiac 455?
In 1973, a 250-horsepower 455 with 370 foot-pounds of torque surfaced along with a 455 Super Duty, which provided 310 horsepower and 390 foot-pounds of torque.
What kind of engine block does a 1970 Pontiac 400 have?
Has good .040 bore. #9792968 DC K168 (2). 370 HP 4-bolt main. 1970 Pontiac 400 Auto YS Code Block $1275. Cleaned, magged & ready to ship.
What was the engine block for a 1969 Pontiac GTO?
1969 350 YE Code Engine Block $175. Cleaned, magnafluxed & ready to ship. .040 bore now, bore to .060 #9790079 DC L038 (2). 1969 GTO 4spd WT Code Block sold. Cleaned, magnafluxed & ready to ship. .030. bore now, bore to .060. #9790071 DC I258 (2). 1969 Pontiac 428 YH Code Block sold.
When did Pontiac stop using multiple carburetors?
The original 4-barrel produced through 1967 is best left for restoration applications. The use of multiple carburetors was banned by General Motors for 1967. Pontiac developed an all-new cast-iron intake manifold for its high-performance engines that model year.
How big is the intake manifold in a Pontiac?
An essential copy of the cast-iron manifold, the runners were raised about .125 inch to match the cylinder head intake ports and improve airflow. To isolate the manifold from excess heat, a separate cast-iron exhaust crossover connects the cylinder heads.