Hot Rod Forum banner
1 - 2 of 1 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
I have located a GMC engine.The only ID I could find was a L86/NA5 number and it is of the GAR family.The engine was in a 1981 school bus. It also indicated that it is a big block 366 cubic inch and to use 91 octane or higher. I would like to know if this engine has a steel crank and if I could convert it to 427 cubic inches by changing the rod lengths. I would like to use this engine for a marine application or 1/4 mile
drag car. Any info in on this engine would be greatly appreciated, since it is running and almost a freebee.

Thanks,
 

·
Registered
Joined
·
2 Posts
Discussion Starter · #3 ·
Originally posted by Tom:
<STRONG>a 366 is a raised big block truck engine It has very small valves and tiny pistons and cannot be bored to 427 or 396 it is a hi torque low rpm slug and belongs back in that schoolbus, but may have a steel crank</STRONG>
Thanks for the information.How can I identify the steel crank and could you please expand on the term raised deck? If this crank is steel could it be installed in a another big block such as a 454 and change the cubic inches by rod lengths?
 
1 - 2 of 1 Posts
Top