Where is the casting number on a Pontiac?
Casting Number The number is usually cast at the center or the right or left exhaust port. Some heads may have the number cast below the spark plug or below the valve cover. The casting on the outside of the head was composed of 6 or 7 digits for early heads.
Where is the date code on a Pontiac?
From 1973 on Pontiac also stamped a secondary head code on the machined pad just below the valve cover. This code designates the heads combustion chamber size. The date code is usually cast lust below the valve cover.
When did Pontiac start using different cylinder heads?
Pontiac used different valves and combustion chamber size for their V8s to change compression ratios, fuel economy, and horsepower output. All Pontiac V8 cylinder heads from 1955 to 1976 are essentially interchangeable. Except for some special heads the bolt pattern, the bore spacing, and deck heights are the same.
How big are the intake valves on a 1967 Pontiac?
The Ram Air IV also has a taller intake port and the Ram Air V has Round Intake ports. These heads will also require special intake manifolds. For 1967 Pontiac increased the valve size of the high output engines. Increasing the intake valves from 1.92” to 2.11” and the exhaust valves from 1.66 to 1.77”.
Where is cylinder number 1 on a Pontiac 400?
Note that the cylinder number 1 is the next driver in front of the engine (the same location on all V-engines) or just the first behind the power steering pump.
Where can I find the Pontiac engine number?
However, these are all searchable online or can be found in Mark Allen’s booklet, Pontiac V8 Engines Factory Casting Number and Code Guide 1955–81, which is available on Amazon or eBay.
Casting Number The number is usually cast at the center or the right or left exhaust port. Some heads may have the number cast below the spark plug or below the valve cover. The casting on the outside of the head was composed of 6 or 7 digits for early heads.
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 kind of head does a Pontiac have?
Round-port Heads. They’re called round-ports because of the round shape of the exhaust ports, which is the part of the head that connects to the exhaust manifold or header. All Pontiac round port heads are big valve heads with 2.11-inch intake and 1.77-inch exhaust valves.
When did the Pontiac 6x head come out?
The 6X head was mounted on the L-78 400 cubic inch displacement engines between 1977 through the final installment of 400 engines in 1979. However, it appeared to many that the Pontiac 350 engine shared the same head with the standard L-78.
When did the Pontiac V8 cylinder heads come out?
Pontiac V8 Cylinder Heads. Over the years Pontiac v8 Cylinder heads came in many specifications. Pontiac used different valves and combustion chamber size for their V8s to change compression ratios, fuel economy, and horsepower output. All Pontiac V8 cylinder heads from 1955 to 1976 are essentially interchangeable.
What kind of head does a Pontiac head have?
PONTIAC HEAD CHART CASTING NUMBER YEAR & FACTORY APPLICATION CHAMBER VOL# CC’S NOTEWORTHY ATTRIBUTES 528511 1958 370 62 1.88/1.6 55-60 INT MAN 538177 61-62 389 62 1.88/1.6 61-64 INT MAN 543797 63 389 62 1.88/1.60 9770716 63 421 HO,64 GTO 65 1.92/1.66
When did Pontiac start putting extra numbers on cylinder heads?
In 1973 Pontiac started stamping extra numbers (1/4″ tall) on their heads.These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers.
How tall is the intake port on a Pontiac head?
PONTIAC HEAD CHART CASTING NUMBER YEAR & FACTORY APPLICATION CHAMBER VOL# CC’S EXHAUST PORT NOTEWORTHY ATTRIBUTES 47 68 & 69 350 AUTO TRANS 72 D-Port 1.96/1.66 48 69 RA3 400, 350 HO 68 D-Port 722 69 RA4 GTO FBIRD 72 ROUND TALL INTAKE PORT 12 70 400 RA GTO FBIRD 72 D-Port