455 swap maybe???

[Rktpwrd]

You will need notched valve covers to clear the Hyvac and maybe the booster as well.

Christian, there's no need for notched valve covers with the stock booster. Here's an old pic of The Juggernaut with the 455 and the stock booster, no issues whatsoever.
Not sure about clearance with the A/C HVAC box, but with the heat only one, I had lots of room.

Just an FYI.

Donovan

 

[Clutch]

From what I have read I thought the oiling issue was the oil passages allows the oil to get up to the top end faster than it can get back down. I also read that people install cam bearing oil restrictors to help keep some more oil I'm the pan

Yup the restrictors look like pipe plugs with small holes in them and there is a lot of tricks to make them return oil without the ext plumbing

 

[Clutch]

Christian, there's no need for notched valve covers with the stock booster. Here's an old pic of The Juggernaut with the 455 and the stock booster, no issues whatsoever.
Not sure about clearance with the A/C HVAC box, but with the heat only one, I had lots of room.

View attachment 64942

Just an FYI.

Donovan

My issue was the ac box but it did work just couldn't get the right side off

 

[1bad79]

You don't need oil restricors there back cam bearings that solve the issue and restricted push rods this way you don't starve the cam or crank, stock valve covers fit fine with a/c if your body bushings are good I have a/c on my car in relitvely stock form

 

[1bad79]

That's a great price for that engine as long as the work performed was done right the g head is a great head the only head that sucks is the j head but even those can be made ok

 

[1bad79]

A complete Core engine is worth 3-500 bucks that's for something that needs to be rebuilt

 

[Clutch]

That's a great price for that engine as long as the work performed was done right the g head is a great head the only head that sucks is the j head but even those can be made ok

Yea the 455 I had in my car first was already built when I got it roller rockers guide plates a jm ?? 20 cam I think don't remember but it had j heads ported like a lot! Ran good but kept eating push rods so I pulled it put in the 72 W-30 and made the car a stick at the same time then life got in the way hopefully I get back to it by July there is 2 ahead of it now

 

[1bad79]

Get a copy of this book it's all you need best 25.00 you will ever spend

 

[olds307 and 403]

Sorry on the booster, that is an A body thing I believe, I could have looked on my car. I know my 260-403 have sat very close A/C box in my 88, a 455 would hit but my body bushings are no doubt wasted. Yah, don't use restrictor's and see where the clearances are at. I would suggest on running the clearances on the high side of stock clearance's. The Olds experts go all over the map on clearance recommendation's.

 

[1bad79]

Sorry on the booster, that is an A body thing I believe, I could have looked on my car. I know my 260-403 have sat very close A/C box in my 88, a 455 would hit but my body bushings are no doubt wasted. Yah, don't use restrictor's and see where the clearances are at. I would suggest on running the clearances on the high side of stock clearance's. The Olds experts go all over the map on clearance recommendation's.

Body bushings make the difference every time