305 Stocker Block Question
 

I am looking for some advice on what direction to go regarding a block for my 305 Camaro. The bore is 3.800" and I'm currently using a 1980 305 block filled with HardBlok. Is this common?

How about sleeving down a 350 block? What sleeves would I use? Particularly brand and part number?

Any other options?

I'm not having any trouble, but I'm just wondering if there's better options.

I will appreciate any help given. Thanks,

Jeremy

Re: 305 Stocker Block Question
 

Jeremy, I've used the stock 305 block with grout on all my 305 stocker stuff, never had a problem. Get a block with a minimal amount of core shift as possible, prep it and race.

Re: 305 Stocker Block Question
 

It was highly recomended to me to sleeve a 350 block , we have been happy with it don't know part #s .---Trevor

Re: 305 Stocker Block Question
 

You could use Melling thick wall diesel sleeves in a 010 350 block if you wanted to. If needed, I can probably get you a part number.

Re: 305 Stocker Block Question
 

I would say the filled 305 block would be quite a bit lighter than a sleeved 350 block, especially on that end. They will live, and plentiful as 350's. I only turn 7200 but my block is now 6yrs old, after filling.

Re: 305 Stocker Block Question
 

Thanks for the replies so far.

Trevor (or anyone else): Do you happen to know the weight of your sleeved block?

Alan: If you really don't mind, could you provide a part number for a sleeve that would work in this situation. I can browse catalogs myself, but thought that someone with experience in doing this very thing could point me in the right direction. Thanks.

I know I have to consider the extra water, but I thought that there was a possibility for weight savings with a sleeved block. Maybe not. Again, no problems with my filled 305 block with 2 years on it so far, just looking at other options.

Jeremy

Re: 305 Stocker Block Question
 

the sleeve job would cost a ton...

Re: 305 Stocker Block Question
 

305 Small Bore SHP Block

Limited quantities are available of a 305 small bore version of Dart’s SHP block. These blocks are intended to give racers in classes that require stock displacement the option of utilizing a high performance block.

Re: 305 Stocker Block Question
 

True, it adds about $800 to $1000 to the cost of a block. However, a filled 350 block with diesel sleeves would be as close to the Dart block Bub speaks of, as close as you can get without buying the Dart.

Re: 305 Stocker Block Question
 

I wasn't too worried , about the extra weight as it's in the right place, prolly about the same as a 305 with hardblok or an aftermarket block.
---Trevor

Re: 305 Stocker Block Question
 

At 28 lbs for a tall fill bucket of HardBlock, it's about equal to the weight of a sleeved block.
Just remember that you cannot use a 4 bolt block.
You may want to try using a 307 block. I have a sleeved 350 block and a sleeved 307 block and I prefer the 307.

Re: 305 Stocker Block Question
 

Why can't you run a 4 bolt main block?

Re: 305 Stocker Block Question
 

I'm interested in the answer to this as well.

I'm sure the Dart Block that Bub suggests is 4 bolt. I don't see the part number in the accepted parts list yet, just the 4.00" bore SHP. Does anyone have information on whether it will be added soon?

I could also drive 1.5 hours to pick up a (factory) 4 bolt main 305 block.

I wouldn't want to get either of these and have them end up being illegal.

Jeremy

Re: 305 Stocker Block Question
 

Greg,
About 5 or 6 yrs. ago we put sleeves in a 4 bolt 350, after all the machine work was done I decided to call NHRA. They told me no way a 305 never came with anything but a 2 bolt. I would bet it would be OK now.
Jim

Re: 305 Stocker Block Question
 

Talked to Dart Today , Not making small bore shp block due to engineering problems. Not planning to make them in the future,
.

Re: 305 Stocker Block Question
 

I have never seen a factory 4 bolt main 305 block ... ?

Re: 305 Stocker Block Question
 

I haven't seen this one either. A friend of mine saw it and told me it was for sale. Came in Canadian service trucks/vans.

Sounds like the small bore Dart block is a no go. If I carry the 4 bolt main 305 around, maybe the sleeved 4 bolt main 350 will be deemed legal. Or maybe the filled 305 blocks will be just fine, looks like they are a common option.

Thanks for the input thus far.

Jeremy

Re: 305 Stocker Block Question
 

I had one about 10 yrs ago. Had I known I was going to try Stock, I would have kept it ! Came out of a Generac Natural Gas Genset off the rear of a Dr's office. 5.0L /w 4 bolt mains. I sold it to a guy who had a round track truck.

Re: 305 Stocker Block Question
 

I won't debate the issue of their existance. I'm quite sure that in the US market, in GM production passenger cars and trucks, GM never installed a 4 bolt, 2 piece rear main seal, 305 block.

Among all the wording in the rule book, it states "no export, marine, or special equipment". That was the reason I was given when I asked years ago. Which in a nutshell means power plant, marine, and over the border parts don't qualify for stocker use (in most cases).

I have not seen one, but I am told the pallet of small bore Bowtie blocks that Patterson bought are two bolt to comply with the rules.

To be honest, at 400 HP, a good two bolt block with nodular caps and high quality sleeves is more than adequate.

Re: 305 Stocker Block Question
 

After approving the Dart SHP block for stock and superstock, do you really think that NHRA cares what you do with your $50 305 block? Do you think they are ever going to look at a bottom of an engine again?

Re: 305 Stocker Block Question
 

Where in rule book does it say anything about has to be 2 bolt block?
Mike Taylor 3601

Re: 305 Stocker Block Question
 

I don't use a 305 block. As I stated, I use a 307 or 350 block.

All the things I do to my blocks (block true, lifter true, align hone, etc), need to be done to a new Dart block as well. If you have never used one you should note that they don't come finished.

The fact that Dart is not making a "small bore block" means you will need to install sleeves, just like we do in 307 & 350 blocks. The only difference is that we start with, as you put it, a $50 block instead of a $2000 block. The required prep work is the same.

Re: 305 Stocker Block Question
 

You are missing my point....NHRA doesn't care if you put 4 bolt caps on a 305. They don't care if you cross bolt a 428 or 390 FE or 440 Chrysler. They don't care. Thats why they approved all the aftermarket blocks.