Anyone done a 4.0 head swap on a 258 ??

sarge · 06-14-2011, 12:31 PM

Well I fell in to a free 258 complete that has a lot of work done to it soooooooo..... I'm taking off Friday to start pulling motors apart to swap my old 4.0 head onto my new 258 . Keeping the F.I. of course.

Been searching the net and found a few good articles but wanted to here from some one that has done it ( cough , cough.... GPER ! ) .

Which dist. do I use?
if I use the 4.0 Dist. do I have to change the gear?
will my serp. setup bolt to the 258?

Any help would be great , I have to get this thing going...... it's killing me seeing all the rigs running around .

GPER · 06-14-2011, 08:10 PM

Why yes, yes I have. The HO head, water jackets drilled, tapped plugged, milled, and valve job.

Crane torquer cam, Mopar Performance valve springs.

Clifford 4.0 intake for a carb, I am going to stick with a carb.
Block bored 0.040 over.

Stock 4.0 exhaust

I haven't put the distributor in yet, but I will use the 258 distributor with the Team Rush upgrade with the e core coil and the Summit CDI box.
I used the stock push rods, a Melling HO oil pump and when I retire is my plan to put the motor in. Or it might come sooner if the bigger carb and header( when I find the hearder) for the 258 that is in the Jeep doesn't do the job pulling the Polaris Ranger on longer trips.

sarge · 06-20-2011, 11:55 AM

Thanks , I got mine about 98% assembled , I used the 4.0 dist. and it seems like it's going to work. Hoping to drop it between the frame rails tonight .

GPER · 07-04-2011, 07:18 AM

Well, fill us in with detail.

fmlewis · 07-04-2011, 11:35 AM

If your looking for a serpetine belt setup from a `86 258 I have a set of parts.

It came from a 258 with the dummy a/c pulley bracket. The only item missing from setup is the alternator bracket but I had planned on leaving the alternator in the orginal location and not running the dummy a/c pulley bracket. Or if I could find a cheap serpetine clutch for my york I would run it complete with OBA then, but I haven't. Now its just taken up space.

If you are interested let me know.

Thanks,
Frank

sarge · 07-04-2011, 05:13 PM

on vacation , I will fill ya inn when I get back , It runs great and I got it in the creek twice before leaving.

06-14-2011, 12:31 PM	#1
sarge Pure Bacon Join Date: Jan 2007 Location: Trenton, Oh Posts: 1,098	Anyone done a 4.0 head swap on a 258 ?? Well I fell in to a free 258 complete that has a lot of work done to it soooooooo..... I'm taking off Friday to start pulling motors apart to swap my old 4.0 head onto my new 258 . Keeping the F.I. of course. Been searching the net and found a few good articles but wanted to here from some one that has done it ( cough , cough.... GPER ! ) . Which dist. do I use? if I use the 4.0 Dist. do I have to change the gear? will my serp. setup bolt to the 258? Any help would be great , I have to get this thing going...... it's killing me seeing all the rigs running around .

06-14-2011, 08:10 PM	#2
GPER Join Date: Feb 2007 Location: Kettering, Ohio Posts: 811	Why yes, yes I have. The HO head, water jackets drilled, tapped plugged, milled, and valve job. Crane torquer cam, Mopar Performance valve springs. Clifford 4.0 intake for a carb, I am going to stick with a carb. Block bored 0.040 over. Stock 4.0 exhaust I haven't put the distributor in yet, but I will use the 258 distributor with the Team Rush upgrade with the e core coil and the Summit CDI box. I used the stock push rods, a Melling HO oil pump and when I retire is my plan to put the motor in. Or it might come sooner if the bigger carb and header( when I find the hearder) for the 258 that is in the Jeep doesn't do the job pulling the Polaris Ranger on longer trips.

06-20-2011, 11:55 AM	#3
sarge Pure Bacon Join Date: Jan 2007 Location: Trenton, Oh Posts: 1,098	Thanks , I got mine about 98% assembled , I used the 4.0 dist. and it seems like it's going to work. Hoping to drop it between the frame rails tonight .

07-04-2011, 07:18 AM	#4
GPER Join Date: Feb 2007 Location: Kettering, Ohio Posts: 811	Well, fill us in with detail.

07-04-2011, 11:35 AM	#5
fmlewis The best damn Engineer!!! Join Date: Aug 2008 Location: Fairfield Posts: 135	If your looking for a serpetine belt setup from a `86 258 I have a set of parts. It came from a 258 with the dummy a/c pulley bracket. The only item missing from setup is the alternator bracket but I had planned on leaving the alternator in the orginal location and not running the dummy a/c pulley bracket. Or if I could find a cheap serpetine clutch for my york I would run it complete with OBA then, but I haven't. Now its just taken up space. If you are interested let me know. Thanks, Frank

07-04-2011, 05:13 PM	#6
sarge Pure Bacon Join Date: Jan 2007 Location: Trenton, Oh Posts: 1,098	on vacation , I will fill ya inn when I get back , It runs great and I got it in the creek twice before leaving.