4.6..is it worth it?

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Sep 18, 2009 | 09:44 AM

#16

jbrew

Technical Article Contributor

Joined: Oct 2005

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From: MI

Quote:

Originally Posted by APT

The 5.4L has more peak torque, but also it hit peak lower, 2500rpm vs. 3400rpm. So under 3000rpm, the F-150 has significantly more torque than the 4.6L, more than the peak numbers suggest. They are from the same engine design with the 5.4L having a longer stroke. The 6.8L V10 is the same (design, bore, stroke) as the 5.4L +2cyl. Edmunds/Kbb suggest the 5.4L adds about $300 over the 4.6L to our trucks.

It depends what year 4.6L. Before 2000 they didn't reach peak torque until you hit 4000 rpm.

Sep 19, 2009 | 08:17 AM

#17

4x4wolf

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Joined: Jul 2002

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From: Osage Beach, Missouri

Yeah they were the 97 and 98's what did they change

Sep 19, 2009 | 10:52 AM

#18

jbrew

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Joined: Oct 2005

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From: MI

Quote:

Originally Posted by 4x4wolf

Yeah they were the 97 and 98's what did they change

97,98,99 and 2000. In 2001 they went to PI heads for the 4six. The 5four went PI in 99.

Sep 20, 2009 | 03:05 PM

#19

4x4wolf

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From: Osage Beach, Missouri

Thanks for the info

Sep 20, 2009 | 03:08 PM

#20

jbrew

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Joined: Oct 2005

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From: MI

Quote:

Originally Posted by 4x4wolf

Thanks for the info

No problem man

Sep 20, 2009 | 04:37 PM

#21

1clean42

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Joined: Apr 2008

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From: Eastland/Stephenville, Tx

Quote:

Originally Posted by 4x4wolf

I was just saying that cause I have known I lot of people who have had a lot of trouble with the 4.2's

Quote:

Originally Posted by glc

I bet they were all 97's and early 98's.......

Quote:

Originally Posted by 4x4wolf

Yeah they were the 97 and 98's what did they change

Quote:

Originally Posted by jbrew

97,98,99 and 2000. In 2001 they went to PI heads for the 4six. The 5four went PI in 99.

I think he was asking about the 4.2s...the 97s and 98s had bad head gaskets, which caused "hydrolocking" to happen. '99 and later 4.2l motors are rock solid in terms of reliability.

Sep 20, 2009 | 05:44 PM

#22

glc

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Joined: Dec 2006

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From: Joplin MO

Bad lower intake manifold gaskets, not bad head gaskets.

Sep 20, 2009 | 06:19 PM

#23

GeoEak

Junior Member

Joined: Aug 2009

Posts: 8

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From: St. Louis, Missouri

I had read from different stat websites that the 4.6 is good for building up the total #'s as in HP, Torque @ low rpms, etc.. Since I'm new here, I think you gentlemen would know and where would you start at so the add on won't be a waste before adding the next part(s).