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Grandson picked up an forgotten Ford product ; a mint condition 81 Cougar (bet few remember those Cougars !!) been garaged in good shape. Problem is the 302 is locked up from sitting. I located a low mile 351W 4V HO in a rusted pickup that really runs out well.
Thinking he could have a fairly good running hotrod for cheap with this combo.
Was the 351 4V in 85 just a little more compression & 4V setup that year over a std 2V ?
Oil pan aside, is it a bolt in ?
Thanks
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Bill Lloyd
1981 Ford F250 4 x 4 351M 4 speed
1993 Aerostar 3.0 V6 5 speed
Well, it's not too difficult a swap. The stock exhaust manifolds may not fit, and the stock air cleaner may not clear the hood. Motor mounts and bellhousing pattern are the same, however.
I think the Cougar is a Fox body, so there will be lots of info on the Foxbody and Mustang sites. I am pretty sure that you can buy headers to suit that swap, since the Mustangs were also Fox bodies.
So it should be a pretty simple swap and not too expensive. The Oil pan and pickup for this application need to come from a mid 80s Crown Victoria with the 351W.
The 351-4V has the "Marine" camshaft, but otherwise is the same rotating assembly and heads as the 351-2V. So it is the same compression ratio.
If that car has the 7.5" differential, it probably won't hold up too long with spirited driving.
What transmission is in the car? That might also need upgrading to stronger components.
The Cougar will have either a C-5 or an early weak AOD. The HO designation is really misleading, there's no much "High Output" to it, it's really just a 351W with a 4 bbl Smog Holley carb. Same heads on it as the 5.0's that year had. Oh, and check the casting numbers on the 5.0 block before tossing it. If it's got a D8VE-6015-A3A casting it's a keeper (long as the block's not cracked) Chances are it's the weak E0AE block though.
The thing you need to watch with a 351 swap is hood clearence. The motor sits up higher then a 302. The exhaust may or may not swap without mods. Accessory brackets may also not all fit up due to the higher deck height of the 351.
All of these issues can be overcome but it may not be worth the work and swaping of parts when you can get a 302 that will bolt up to everything just as it sits with out a problem. The only issue with a 302 is if you use a roller equipted one. Then you would have to change the cam gear on your old dist to a steel one.
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