Are Pontiac 62 heads good?

Very good performing head, buy ’em! They are one of the ‘good’ high-compression big-valve 400 heads. They were used on ’69 400 and 428 performance engines.

What are 4X Pontiac heads?

The 4X head was the 49-state casting used on all ’73-74 400 and 455ci engines. Since Pontiac offered the 400 2-barrel, the 400 4-barrel with both manual and automatic transmissions, and the 455 4-barrel for 1973 and 1974, separate applications of the 4X head were required to meet such broad usage.

What degree are Pontiac heads?

Until ’67, the valves within in a stock Pontiac cylinder head were at an angle of 20 degrees from the piston centerline, and it was revised to 14 degrees after that.

How do you port a Pontiac head?

Are Pontiac 670 heads good?

They are good heads, but a set of 6X can serve just as well in my opinion. One thing most always over looked when using 670s is the cylinder notch needs to be at a different location than later engines because of their unique chamber. They’re one of the better high compression big valve heads.

Which Pontiac heads are the best?

The Best Pontiac Heads
  • D-Port Heads. D-Port heads are the most popular Pontiac heads. …
  • Round-port Heads. Round-port heads came on the highest-horsepower Pontiacs in 1968, 1969 and 1971-1974. …
  • Aftermarket Heads. Private manufacturers offer heads that will bolt onto your Pontiac V-8 block.

Are Pontiac 13 heads any good?

Yes they are a pretty good head. Like b-man said, any 67-70 large valve d-port head is pretty well the same performance wise.

How do I identify a Pontiac 400 engine?

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.

Are 46 Pontiac heads good?

An excellent head. Easily converted to the bigger 2.11/1.77 valves and screw-in studs. You’ll end up with a head that’s every bit as good as one of the factory big-valve high-compression heads of that era.

Are 16 Pontiac heads good?

The #16 head is a good head to use use to build power with if it is the round port or the large valve screw in studs. Otherwise a boat anchor would be just as good. As far as the 670 heads they are a closed chamber head from 67.

What is the bore and stroke of a Pontiac 400?

For 1967, Pontiac retired the 389 cu in (6.4 L) and replaced it with the 400 cu in (6,554 cc), a 389 bored-out by +0.06 in (1.5 mm) to a bore and stroke of 4.12 in × 33⁄4 in (104.6 mm × 95.3 mm). The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year.