home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications

Thread Tools Display Modes
Old 07-28-2019, 12:50 PM   #1
Board Member
vintagewrench's Avatar
Join Date: May 2016
Location: Vermont
Default 1974 and '75 B20 Eight Bolt Blocks

In the planning stages of building a new engine for our 1968 122s wagon which will see HARD high rpm use as the shop "truck," road car, and which will also be used for some towing.

Have access to both 1974 and 1975 B20 eight bolt engines and want to know what will hold up the best in the long run.

It has been reported that the '74 engines in addition to having bad cams suffered from soft blocks and cylinder bores that are also porous and wear out of round quicker. Does anyone know if this is actually true or is it and old "wife's" tale? Did Volvo ever publish anything about this in their service bulletins?

Seeing as the '74 engines supposedly had "soft" cams could the bores have just worn faster because of all of the extra cast iron junk floating around in the oil windage that did not get filtered out?
1967 1800s - - - 1968 122s Station Wagon
vintagewrench is offline   Reply With Quote
Old 07-28-2019, 07:00 PM   #2
Happy playing the blues
dl242gt's Avatar
Join Date: Jun 2002
Location: S NJ, a suburb of Phila.

I like the 75 engines better as they are metric threaded blocks. Also 75 had breakerless ignition which is nice to use. But having owned both with at least 200k on the 74 and over 300k on the 75 we used to have. Both were durable in my experience. It's the fiber cam gear that stopped the 75. It broke apart at about 325k and the engine had that crap everywhere inside. We put a rebuit engine in there and rolled the car for a while longer.
dl242gt is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -4. The time now is 08:28 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.