SBC 461 heads

Greg Reimer 7376 · 03-26-2021, 10:54 AM

The 3917290 head at first glance resembles a Power Pack head, but the PP head has a pointed pyramid marking on the end. The 3917290 head has a rounded hump in the middle of the marking on the end. At first glance, they look the same, but the 290 head was a one year only head, 1968, for the 250 horse 327. It had rather large chambers and 1.72 intakes and 1.50 exhausts. The 250 horse 327 that year came only in Chevelles and the Impalas,Bel Airs and Biscaynes. Quite a few Super Stock GT combinations use them, but Stock is pretty limited to only those two body lines. The 68 250 horse 327 is not to be confused with the 62-65 engines, these had 4 jet carbs and the 896-520 power Pack heads, except that the 65 250 horse engine used the 461 castings. The 462 casting came on the 67-68 engines and could be used on the earlier motors, but the 461 can't be used on a '68 327 275 horse. That included a lot of Camaros,Novas Chevelles, Vettes, and the big cars, so the 462 casting is definitely more useful to class racers. It's identical to the 461 except for the casting number. The 69-70 041 head is a legal replacement for the 462, as is the 291 head going all the way back to a '62 327/300 horse engine.

03-26-2021, 10:54 AM	#7
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,137 Likes: 172 Liked 719 Times in 220 Posts	Re: SBC 461 heads The 3917290 head at first glance resembles a Power Pack head, but the PP head has a pointed pyramid marking on the end. The 3917290 head has a rounded hump in the middle of the marking on the end. At first glance, they look the same, but the 290 head was a one year only head, 1968, for the 250 horse 327. It had rather large chambers and 1.72 intakes and 1.50 exhausts. The 250 horse 327 that year came only in Chevelles and the Impalas,Bel Airs and Biscaynes. Quite a few Super Stock GT combinations use them, but Stock is pretty limited to only those two body lines. The 68 250 horse 327 is not to be confused with the 62-65 engines, these had 4 jet carbs and the 896-520 power Pack heads, except that the 65 250 horse engine used the 461 castings. The 462 casting came on the 67-68 engines and could be used on the earlier motors, but the 461 can't be used on a '68 327 275 horse. That included a lot of Camaros,Novas Chevelles, Vettes, and the big cars, so the 462 casting is definitely more useful to class racers. It's identical to the 461 except for the casting number. The 69-70 041 head is a legal replacement for the 462, as is the 291 head going all the way back to a '62 327/300 horse engine.