3500 heads vs. 3400 [Archive] - GrandAmGT.com Forum GrandAmGT.com Forum > GAGT - Technical - Sponsored by www.MilzyMotorSports.com > Technical Q&A > 3500 heads vs. 3400 PDA View Full Version : 3500 heads vs. 3400 bwwelk07-30-2006, 03:24 PMI was wonderin is it true that 3500 heads will fit and or bolt up to a 3400 motor ?? And if it can be done how much hp gains would there be?? Sprucegagt07-30-2006, 10:41 PMGo here and ask the same question. They should have an answer for you. http://www.60degreev6.com vBulletin® v3.7.2, Copyright ©2000-2018, Jelsoft Enterprises Ltd.