300+ rebuild

[BottleHauler84]

3 hours ago, Joey Mack said:

Freighttrain... I hope you dont mind if I Hijack a page or 2 on this thread?  Im trying to help Bottlehauler.

 

Thank you Joey!

@Freightrain I've been following along. This is a great thread. Thanks for keeping the posts coming!

[Joey Mack]

Are the 443 seals what you need,  BH ?

[Freightrain]

I think I have a plan.

Remove the inner sleeve.and then shorten the length to make it just like the 673.

I think it will work out fine.  The wear spot from the seal will be inside past the seal because shortening the sleeve length will move the seal outward toward the flange.

 

Looks doable.  Luckily I know a guy at a machine shop....😉

[BottleHauler84]

4 hours ago, Joey Mack said:

Freighttrain... I hope you dont mind if I Hijack a page or 2 on this thread?  Im trying to help Bottlehauler.

 

I do believe those are what im after. 

[Joey Mack]

Thanks Freightrain.  We will use P.M. from now on... Jojo

[other dog]

When is the first race? Maybe we should get started on a "go fund me" so you can afford some fuel for the truck and some gas for the race car.

[mowerman]

Great progress … let’s keep it up 

[Freightrain]

Oil cooler rebuilt and hanging on the block.  I won't torque it down until I get the water pump housing installed so I can line up the holes.

Will get water pump cleaned up next and get housing put in block.  

 

The pile of parts is decreasing at a steady rate.  Whew......

[mowerman]

lol Larry, I love that last comment.Nice going  man let’s keep it up. You’re certainly well on your way.

[mowerman]

After all that fist fighting with the injectors, everything else is going to look easy or at least here is hoping

[mowerman]

Be a while for me it’s been snowing on and off past few days won’t be able to move that bucket of bolts for a couple of months not cool

[Vladislav]

On 2/17/2026 at 5:58 AM, Freightrain said:

I think I have a plan.

Remove the inner sleeve.and then shorten the length to make it just like the 673.

I think it will work out fine.  The wear spot from the seal will be inside past the seal because shortening the sleeve length will move the seal outward toward the flange.

 

Looks doable.  Luckily I know a guy at a machine shop....😉

You can do that with a corner grinder  Accompanied by a caliper for control of evenness and a piece of sand paper put on glass for final finishing of the end.

Sure machine shop is much better option!

[Vladislav]

So those valve seals for 0,5" stems - are they Mack part? Which engine were they supposed to be installed onto originally? 

I knew that stuff for E7 Joey posted but never heard of seals for 1/2" stems.

BTW my Lanova engine also had 1/2" stems both intake and exhaust and it used steel caps put under the stem upper dishes for "shielding" the oil. 

[mrsmackpaul]

3 hours ago, mowerman said:

Be a while for me it’s been snowing on and off past few days won’t be able to move that bucket of bolts for a couple of months not cool

Not cool or to cool

I'll be out in my bucket of bolts running hay again tonight 

Rolls of hay go this way, rolls of hay go that way 

Stuff just goes round and round lol

 

Paul

[cruiseliner64]

At least your keeping busy Paul.....

Paul

[Freightrain]

3 hours ago, Vladislav said:

So those valve seals for 0,5" stems - are they Mack part? Which engine were they supposed to be installed onto originally? 

I knew that stuff for E7 Joey posted but never heard of seals for 1/2" stems.

BTW my Lanova engine also had 1/2" stems both intake and exhaust and it used steel caps put under the stem upper dishes for "shielding" the oil. 

My 237 had 1/2" stems, as the lash caps for the Jake's will work perfectly on the 300.

I never had valves out of 237 so don't know if it had seals?  The 300 heads definitely do have seals.