Chevy Tri Five Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
13 Posts
Discussion Starter #1
Hi guys. A question about the '56 Heads. 1956 Heads with a "casting mark" that looks like "A" in this photo. Were they used on the 265 2BBL carb engines, or the 4BBL engines, OR used on either engine depending on the transmission used, automatics or standards? I've seen some photo's where these "A" cast marked heads are on a '56 265 engine with the 4BBL carb. These cars being 65 years old sometimes parts may have been replaced over time. Thanks, Todd
334669
 

Attachments

·
Registered
Joined
·
13 Posts
Discussion Starter #3
mr55/56, so the style "A" heads would be incorrect heads used with the 4BBL and should have a 2BBL carburetor yes?
 

·
Registered
Joined
·
533 Posts
Hi guys. A question about the '56 Heads. 1956 Heads with a "casting mark" that looks like "A" in this photo. Were they used on the 265 2BBL carb engines, or the 4BBL engines, OR used on either engine depending on the transmission used, automatics or standards? I've seen some photo's where these "A" cast marked heads are on a '56 265 engine with the 4BBL carb. These cars being 65 years old sometimes parts may have been replaced over time. Thanks, Todd View attachment 334669
A = 2bbl
B = 4bbl
C = 57 2x4 set up
D = 56 2x4 set up
all others are later heads
Larry chevyman57
 

·
Registered
Joined
·
2,376 Posts
Correct me if I am wrong but all 55 heads are style A. 56 was first year for stlye B on 4 barrel.
 

·
Stainless Trim Restoration
Joined
·
9,588 Posts
There is only one head used in 55, style A. 56 2bbl and all 55 heads work the same, but the casting boss on 56 is thinner than 55.

Thinner in the distance from the face of the head.

Mikey
 

·
Registered
Joined
·
2,376 Posts
I have also always believed that style B was used on 2 barrel motors starting in 63 and along with .390/410 lift cam was responsible for 283 hp moving from 185 to 195 for 2 barrel model.I dont recall style A after 1962. I remember the slug 283 in the 64 Chevy truck I drove to HS hd style B. Man when Dad bought the 72 Chevanne Super it was a rocket, the th350 shifted into third at WOT at a higher speed than the top end of the 64.
 

·
Registered
Joined
·
1,156 Posts
Your 56 should have the 064 casting number if it's the original head. The pyramid head on an original 56 is 4 barrel with 306 casting number. The 2 vertical bars were 762 casting number used only on later production dual 4 barrel carbs. There are later heads with the 2 vertical bars but they are not 762 castings. 55 passenger heads were 523 casting number, if you're interested.
 
1 - 10 of 10 Posts
Top