5.7-6.1 Hemi

[ply64post]

Need some input on what year engines [5.7 and 6.1] would be
the best because of manufacturing upgrades to install in an older
car.I would like to one of the two into a 78 volare wgn or a 64 Belvedere.

Thanks Jeff

 

[Cranky]

From what I read...the 6.1 is the better engine but don't know anything about how either fit into the older cars. Last months Hot Rod has a pretty good writeup on both....

 

[greenmonsta79]

I would stay away from 5.7's older than 2005, I have seen one too many drop a valve seat and bingo, BANGO. I have seen quite a few in local shops for that reason alone, I really like the thought of putting a newer fuel injected motor in a old Mopar but man I have seen too many failures in the 5.7's to justify it.

 

[5.7 hemi]

It really doesn't matter the year of the engine, some have had problems, some are still going strong after 200000 miles.

 

[bbcharger71]

I have a 5.7 in my truck and even after 100k it runs like new. These motors put out some serious power with just a couple of upgrades (cam, headers, tune). My father-in-law owns and salvage yard and sells 4X's as many Vortecs to repair shops then he does the Hemi. There is a slight problem with the valve ( i think it's the #7 intake) ticking. It has something to do with the seat. I got my truck with 66k and it has ticked since day one and never gave me any problems.

 

[5.7 hemi]

The ticking is from the pushrod being alittle short, put in 6.1 pushrods and that tick goes away.

 

[bbcharger71]

Ok thanks, I'm not too worried about it though. I was just stating that was the only "major" problem with the new Hemis that I knew of.

Jeff, If money isn't an issue, I would go with the 6.1. But if not, 5.7 are a dime a dozen in salvage yards. Just remember some of the newer ones have the multi-displacement feature.

 

[ply64post]

multidisplacement

bbcharger71

What year is the multidisplacement feature used and is it an
issue if installed in an older car? I'm not sure which direction
I will take as far as fuel injection or carburation.

Thanks for any Help
Jeff

 

[Cevidicus]

Check out the New Hemi Swap forum on our sister site, FABO. Tons of great info. Search around and you will find answers to your questions.

http://www.forabodiesonly.com/mopar/forumdisplay.php?f=83

 

[bbcharger71]

I think 05 was when the multi-displacement came out and i'm not sure if it is an issue with these swaps or not. I think you can reprogram the PCM to delete it. Check out that link that Martin put up.

I would say this though, if your going through the trouble to put a new Hemi in your car, Go with the EFI. It will definately be worth it!