421 Engine Codes

[shake435]

Hey guys does anyone know the 421 engine horsepower ID codes for the 65 and 66 years?

Shake

[Stu Norman]

1965 421 codes:

WG
YH
WH
YJ
WJ
YK

1966 421 codes:

WG
YH
YZ
WH
YJ
WJ
YM
YK

Basically the 4 bbl engines had around 330-350 HOP, the 3x2 engines had 356-370 HP.

[shake435]

Stu thanks for the reply do you happen to know what the horespower is for the coresponding codes you provided?

Shake

[Stu Norman]

Why yes, I do!

Did you want them all or was there a specific code you wanted?

[Stu Norman]

HP CI TRANS CODE C/R Cam Heads Carb Year
338 421 M WG 10.5 67 76 4 65
356 421 M WH 10.75 67 77 3X2 65
376 421 M WJ 10.75 68 77 3X2 65
338 421 A YH 10.5 67 76 4 65
356 421 A YJ 10.75 67 77 3X2 65
376 421 A YK 10.75 68 77 3X2 65
338 421 M WG 10.5 67 92 4 66
356 421 M WH 10.75 67 93 3X2 66
376 421 M WJ 10.75 68 93 3X2 66
338 421 A YH 10.5 67 92 4 66
356 421 A YJ 10.75 67 93 3X2 66
376 421 A YK 10.75 68 93 3X2 66
376 421 A YM 10.75 68 93 3X2 66
350 421 A YZ 10.5 66 92 4 66

[shake435]

Stu:

You are the man... Thank you very much.... I noticed that you ranked the 1965 2 + 2 as one of your top ten favorites... It is my dream car but they are hard to find. Do you know of any one who has one looking for a new home?

Shake

[Stu Norman]

There is a 1965 2+2 ragtop for sale in the classified section on this site.

[shake435]

Stu:

Thanks for the heads up... I've already contacted him, I am awaiting a reply...

Shake

[Stu Norman]

Good luck!

[Stu Norman]

You might also want to check this on ebay.

http://cgi.ebay.com/ebaymotors/RARE-1965-PONTIAC-2-2-CONVERTIBLE-PARTIALLY-RESTORED_W0QQitemZ270024330468QQihZ017QQcategoryZ6386QQrdZ1QQcmdZViewItem