The Stovebolt Site Forums The Shop Area Engine Shop Possible 261 block with the mystery "M" casting mark

Help is a click away!

VEHICLE
INFORMATION
KITS

at the

GM Heritage Center
All the details are here.

Searching the Site - a click away

New here ??? Where to start?

Click on image for the lowdown.

====

Who's Online Now

4 members (Robert Crandall, Red75bronco, 52Carl, crenwelge), 107 guests, and 1 robot.

Key: Admin, Global Mod, Mod

Forum Statistics

Forums66

Topics128,127

Posts1,056,675

Members48,450

Most Online14,466
Apr 26th, 2026

Step-by-step instructions for pictures in the forums

Brad Allen's photos

AD Chevy Trucks

Pictures galore

Over 6,000 pictures

Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips.

Check them out!

Lots of work on Brad's part ... pure enjoyment (and references) for you!

Big Thanks!

THANKS!

For helping keep this great
old truck web site
on the Internet for

over 30 years!

and not clogged down
with Ads!

Again, thanks!

Print Thread

Re: Possible 261 block with the mystery "M" casting mark GMCanada9430 #1286488 11/07/2018 3:42 PM
Joined: Jan 2001 Posts: 5,337 Snohomish,WA,USA P Pre '68 Dave 'Bolter
Pre '68 Dave 'Bolter P Joined: Jan 2001 Posts: 5,337 Snohomish,WA,USA	If it has the low mount water pump and captain bars, it is a 261. See the USA in your vintage Chevrolet! My Blog

Entire Thread
Subject	Posted By	Posted
Possible 261 block with the mystery "M" casting mark	GMCanada9430	11/07/2018 4:50 AM
Re: Possible 261 block with the mystery "M" casting mark	sstock	11/07/2018 1:14 PM
Re: Possible 261 block with the mystery "M" casting mark	Grigg	11/07/2018 1:25 PM
Re: Possible 261 block with the mystery "M" casting mark	GMCanada9430	11/07/2018 3:37 PM
Re: Possible 261 block with the mystery "M" casting mark	Pre '68 Dave	11/07/2018 3:42 PM
Re: Possible 261 block with the mystery "M" casting mark	Hotrod Lincoln	11/07/2018 3:59 PM
Re: Possible 261 block with the mystery "M" casting mark	Pre '68 Dave	11/07/2018 11:16 PM
Re: Possible 261 block with the mystery "M" casting mark	Mike B	11/07/2018 4:08 PM
Re: Possible 261 block with the mystery "M" casting mark	Dragsix	11/07/2018 4:36 PM
Re: Possible 261 block with the mystery "M" casting mark	GMCanada9430	11/07/2018 7:13 PM
Re: Possible 261 block with the mystery "M" casting mark	Curt B.	11/07/2018 7:58 PM
Re: Possible 261 block with the mystery "M" casting mark	Hotrod Lincoln	11/07/2018 8:19 PM
Re: Possible 261 block with the mystery "M" casting mark	Curt B.	11/07/2018 10:42 PM
Re: Possible 261 block with the mystery "M" casting mark	Hotrod Lincoln	11/07/2018 10:54 PM
Re: Possible 261 block with the mystery "M" casting mark	Dragsix	11/08/2018 3:40 PM
Re: Possible 261 block with the mystery "M" casting mark	Fox	11/09/2018 4:38 AM
Re: Possible 261 block with the mystery "M" casting mark	Leo	11/11/2018 11:13 AM
Re: Possible 261 block with the mystery "M" casting mark	tclederman	11/11/2018 6:12 PM
Re: Possible 261 block with the mystery "M" casting mark	GMCanada9430	11/12/2018 4:23 AM
Re: Possible 261 block with the mystery "M" casting mark	Grant_Bowker	11/15/2018 1:46 AM
Re: Possible 261 block with the mystery "M" casting mark	GMCanada9430	11/19/2018 3:40 AM

Moderated by Phak1, Woogeroo

Hop To

Link Copied to Clipboard