1966 Chevelle

[CT Mark]

[ QUOTE ]
The true 360 hp most were 4-bolt blocks.

[/ QUOTE ]

This might be true but it hasn't been my experience. I've heard about and seen VERY few 66 360 hp Chevelles that had the 962 block. All but a handful have been 961.

[Kim_Howie]

I have owned 5 962 4-bolt 360 hp and have since one 961 4-bolt block still own 2

[Paul D]

My '66 L78 is a 961 block. It was a Fremont build 07B.

Paul

[Kim_Howie]

Paul They made both. My experence is that most were 962 blocks for the 360hp. Just going with what have seen.

[MYSTERYCHEVELLE]

I'd have to respectfully disagree and chalk your experience up to bizarre coincidence.. 325 and 360hp 66 Chevelles almost always got 961 2 bolt blocks.. 375hp got the 4 bolt 962 block.. exceptions to all cases of course..

[nuch_ss396]

If I recall correctly, back in the day, there was a service
bulletin issued by GM to all dealers alerting them to the
fact that some of the 360hp engines used 4-bolt main
blocks. I believe that this was done to avoid piston dome
confusion ( collision ) with the oval port heads.

I guess in a round about way I am saying that I believe both
blocks were used across the 360hp application.

[MYSTERYCHEVELLE]

Not denying both were used.. but wayyyy less 962 360hp than 961's... FACTORY INSTALLED 360's were predom. 2 bolt 961

Mike

[Kim_Howie]

Kind of like the story about the 3 blind men trying to figure out an elephant. That my story and I'm going to stick with it.

[Kim_Howie]

One of the reason I felt most were 4-bolt blocks I looked at block 15 years ago that was a 961 block with factoy 4-bolt mains and also was suffixed as a 360 hp.