Pressure checking my 460
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Tuned
Joined: May 2008
Posts: 334
Likes: 41
Pressure checking my 460
I have a 460 that I'd like to put into my F250 to replace the current 351M that's lagging in power.
Me and a friend did a compression check today and this is what I have.
Front
140 135
115 142
115 127
135 125
What should be a good pressure for a '76 F250 460?
I haven't done too much research yet, but I've read that I might get better low end torque from the longer stroke of the 400. Is this true? If so, this swap will most likely be short term (a year or so) while I rebuild my 351M into a decent 400.
So, I'm looking for advice: Should I go ahead and do the swap?
Or
Should I stick it out a little longer with the 351M and do a rebuild on the 460?
FWIW: If I do the swap now, I'll replace the oil pump just in case. Also, the 460 has had a new double roller timing chain and new cam in the last year or two.
BTW: I know this post is borderline on being inappropriate for this forum, but I am asking about a 460...
Me and a friend did a compression check today and this is what I have.
Front
140 135
115 142
115 127
135 125
What should be a good pressure for a '76 F250 460?
I haven't done too much research yet, but I've read that I might get better low end torque from the longer stroke of the 400. Is this true? If so, this swap will most likely be short term (a year or so) while I rebuild my 351M into a decent 400.
So, I'm looking for advice: Should I go ahead and do the swap?
Or
Should I stick it out a little longer with the 351M and do a rebuild on the 460?
FWIW: If I do the swap now, I'll replace the oil pump just in case. Also, the 460 has had a new double roller timing chain and new cam in the last year or two.
BTW: I know this post is borderline on being inappropriate for this forum, but I am asking about a 460...
Freshman User
Joined: Jun 2007
Posts: 39
Likes: 0
Rule of thumb is to be within 80% witch you are borderline with the two cylinders at 115.
Was the engine hot or cold?
How long has the engine sat for?
The 460 swap is not all that easy you well need different motor mount and towers for sure.
If you are just looking for a engine to replace your 351 while you build it then find another 351m or a 400 because they well just bolt right in.
Was the engine hot or cold?
How long has the engine sat for?
The 460 swap is not all that easy you well need different motor mount and towers for sure.
If you are just looking for a engine to replace your 351 while you build it then find another 351m or a 400 because they well just bolt right in.
Thread Starter
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Tuned
Joined: May 2008
Posts: 334
Likes: 41
The truck is already on the road and needing another engine. I want something that is going to give me more power than the factory 351M which is really a dog. It runs well, but doesn't have the power I'd like.
I will be doing some weekend rework things here and there, but nothing that's going to take it off the road for an extended period of time.
I have a '76 F250 that I'm pulling the 460 out of, so I'm thinking those mounts will transfer over to my '78.
The engine was dead cold and has been sitting for at least three weeks.
I will be doing some weekend rework things here and there, but nothing that's going to take it off the road for an extended period of time.
I have a '76 F250 that I'm pulling the 460 out of, so I'm thinking those mounts will transfer over to my '78.
The engine was dead cold and has been sitting for at least three weeks.
Fleet Mechanic
Joined: Mar 2004
Posts: 1,398
Likes: 17
From: Hesperia, CA
I think I would put a little oil in the two low cylinders and crank the engine a few times and retest to see if there is any difference. It is possible that the oil drained down on those two cylinders with it sitting for so long. They are definitely questionable, but it could just be a matter of weaker oil control rings on those two cylinders.
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