Moderator, Iowa Chapter Director, Uber Luber, TCCo
Just wondering about wether it would be possible to put in a 4.2 f-150 crank on a 3.8. Because from what I understand, the 3.8 actually has a bigger diameter cylinder, it's just that the 4.2 has a longer stroke and actually a smaller diameter cylinder, so my theory is, and this is just a theory I'd appreciate some input on this, is that with a 4.2 crank, if it fits, would add maybe 50-70 hp? I know that's a big jump, but that's what the major difference is between a 3.8 and a 4.2...that and the split port intake, which I've heard from rancherlee that a extensively modified 3.8 intake can outperform a split port. so I was just wondering about that, if it's possible I think I may do that and put in dished pistons to rpepare for a possible vortech, but I'll decide on that when I get there, and port and polish the intakes and block. Thanks in advance.