Is a Mexican Block Worth the Trouble?

[Stephen & Horace Johnson]

If you have the money get the boss block it's alot better than the stock block..but I know a few SBF guys that are running the stock block with no issues in SS.. I would def put hard block in it. I have a Mexican block in my mustang and has run some 10.30s...with a stickshift at 7400rpms..

[randy wilson]

I don't know about filling a Ford block, but I've filled three GM 283, and 327, and 350 blocks in my life. I would NEVER fill a block. Every time we've done it, when you get ready to re-hone, the chatter from the stones going down in an oblong bore, is deafening. They NEVER stay round. On the other hand, when not using filler, the block was WAY straighter. And yes, we use a plate.

[BillK]

Originally Posted by randy wilson

I don't know about filling a Ford block, but I've filled three GM 283, and 327, and 350 blocks in my life. I would NEVER fill a block. Every time we've done it, when you get ready to re-hone, the chatter from the stones going down in an oblong bore, is deafening. They NEVER stay round. On the other hand, when not using filler, the block was WAY straighter. And yes, we use a plate.

Randy,
Curious as to what you filled the block with ? I had the same experience years ago with a block I did for a customer that he had filled. He used one brand of filler that I had never used and his block did move around a lot on the first freshen-up and a little bit the second time.

I have always used Hard Block and have never had it move around ?

[Paul Precht]

When filling I use Halco Machine Grout and leave the block sit for at least a month with the mains and both heads torqued, then I bore and hone. If you're in a hurry it becomes a compromise situation.

[FireSale]

Got an email from this fella and it's still for sale. He says it was last bored 50 over. The NHRA limit is 80 over, so is this block weakened if it's a total of 60 over stock?

Dale

[HR9121]

I ran a 302 Mexican block in my hr/sst car a couple years ago, it was 60 over and not filled. Made over 400 passes with never a problem and it turned 77-7800 when running 1/4 mile.

[Pat Cook]

Is the Ford Motorsport block legal?

Part number M6010BOSS302K

[FireSale]

Originally Posted by Pat Cook

Is the Ford Motorsport block legal?

Part number M6010BOSS302K

That's the interesting part. it's not a BOSS block. It's a 302 replacement block made in Mexico and used by Ford for a lot of warranty stuff. It's a little stronger that the stock 302 because it's a bit thicker and has beefier mains, they are still 2 bolt, though. Bore, stroke and deck height are stock equivalent 302. Just stronger.

It's still for sale and has only been bored out the 50 over. I'm going to look at it next week. It's a little more sane for me as a hobby racer on my first build.

And, yes, the 6010 is legal in SS.

Dale

[Stephen & Horace Johnson]

Originally Posted by FireSail

Got an email from this fella and it's still for sale. He says it was last bored 50 over. The NHRA limit is 80 over, so is this block weakened if it's a total of 60 over stock?

Dale

If it was standard I would probably use it if you have it..
As plentiful as the blocks are do not waste the money on a 50 over block...

[randy wilson]

Bill, I think they used Hardbloc, but not sure. Been 10 years ago. There may very well be a way to do it right. I know lots of people swear by it, and some of them are hitters. I'm just giving my little bit of experience with it. On one .90 over 283, (I know that's a weird bore size) it never stopped moving around, even after 4 hones. It was an SS\CS 287, north of 600 HP with iron bowties.