Where is the code on a Pontiac engine block?
Identify a PONTIAC engine block is very simple, the code is entered, or rather “hit” on the front right of the cylinder block (when you’re driving), close to the plane of the cylinder head gasket. Often it isn’t visible at first sight either because it may be hidden by rust, paint or air conditioning compressor support.
Where is the displacement stamp on a Pontiac engine block?
There is no displacement stamp for 421, 389 or 326 blocks. To further identify the year and application, move to the top and rear of the block, where the distributor is mounted. Here you will find the date code and block casting number.
Where are freeze plugs on Pontiac engine blocks?
Blocks cast from 1955–66 have two freeze plugs while the 1967–78 blocks have three freeze plugs. Once done there, go ahead and inspect the driver’s side of the block. 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.
When was the first Pontiac engine block cast?
For example, a block stamped “J129” was cast October 12, 1959, 1969, or 1979. Armed with the previous clues, you can pin the year down. 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.
When did the Pontiac Trans Am Come Out?
Pontiac for instance, introduced their new high performance engine package in 1977 Trans Ams, Formulas and select Can Ams. It was called the W72 high performance package. What Pontiac did was create a new casting number for their 400 engine block and added some nice pieces to improve the engine.
How are engine blocks cleaned in a Pontiac?
Engine blocks are cleaned then magnafluxed to check for cracks. The cylinder bores are measured at the top, bottom and center as well as inspected for damage.
There is no displacement stamp for 421, 389 or 326 blocks. To further identify the year and application, move to the top and rear of the block, where the distributor is mounted. Here you will find the date code and block casting number.
What was the facelift for the Trans Am engine?
The Trans Am and Formula bodies were given a facelift that year that carried them successfully to the end of their 12 year run. The new front end eliminated the grille and pushed all radiator ventilation under the one piece molded nose. An air dam and two turn signal lamp grilles fed cool air to the rad.