Are the GM 454 Vortec L29 heads a good performance upgrade from stock heads on an '86 454 truck engine? Specs indicate 99/100cc combustion chamber.
Randy67
11-30-2010, 09:39 AM
Check this link for info. http://www.strokerengine.com/BBCengines.html
It's toward the bottom of the page, looks like some good info on using the heads on Mark IV blocks.