# WTB: 454ci BBC **URL:** \ **Category:** Classifieds\ **Created:** [March 9, 2009, 7:18pm UTC](https://forums.speedlife.net/t/wtb-454ci-bbc/202158 "2009-03-09T19:18:59Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![SixSpeed454SS](https://avatars.discourse-cdn.com/v4/letter/s/e19adc/32.png) [@SixSpeed454SS](https://forums.speedlife.net/u/SixSpeed454SS)\ **Post date:** [March 12, 2009, 5:53pm UTC](https://forums.speedlife.net/t/wtb-454ci-bbc/202158/7 "2009-03-12T17:53:02Z")
> [@Can I tow a car trailer with a truck from Enterprise?](https://forums.speedlife.net/t/can-i-tow-a-car-trailer-with-a-truck-from-enterprise/39801/12): > > (older the better) What do you intend to do with it? For the most part, 454’s are the same from 1970-1990 & they are considered Mark IV. Most everything interchanges between all years. The Mark IV has a 2 piece rear main seal & the later ones have weak cranks. Mine is a 1990 & the crank & 1 piston broke when it had 26K miles on it. The last 2 or 3 years of the Mark IV production motors were junk (Brian will tell you all BBC’s are junk). 1991 & up production 454’s are Mark V & do not have a provision for mechanical fuel pump. Also have 1pc rear main seal & many other small changes. Some issues can occur if putting Mark IV components on Mark V blocks. Not impossible, though. The aftermarket has supported the Mark V pretty well. The Mark VI has all the benefits of the Mark V plus a mechanical fuel pump boss. I am not positive if there ever was a Mark VI ‘production’ 454ci block. I think the 496 (8.1L) are all Mark VI. Brian can probably confirm this. That 496 short block is a steal for $500. --- _[View the full topic](https://forums.speedlife.net/t/wtb-454ci-bbc/202158)._