Does anybody make an aftermarket chevy smallblock w/1 piece main seal?
The mustang crowd has its R block,for heavy horsepower applications....
Or is the factory 4bolt as good as it gets...
How strong is the factory 4 bolt that was in the C4 vette's?

 

Dart makes aftermarket blocks.

 

World Products also sell aftermarket blocks.

 

Thanks!!

 

Sorry, didn't see your second ? there...

The factory 4 bolt is pretty strong. Stud the mains and put in some billet caps and you can throw a lot of power at it... You can also add block filler to strengthen it up too, but I only reccomend that for race apps (if you need block filler than you're probably not running on the street anyways, lol).

 

I just got done building a motor with a ZZ4 short block, I did alot of research on these short blocks and asked alot of questions, it is honestly the best bang for the buck, I bought the complete short block though, i'm not to sure if you can just buy the block and go from there or you have to buy it complete, i have friends that run 10.90's in the quarter with this block and he is shifting at 7 grand and he is going on his third year with this motor in the drag car with out it having to be rebuilt yet. If you have the money laying around i would go with the ZZ4, if you have any questions just let me know and i may be able to answer them for you.

 

Don't get me wrong aftermarket blocks are great peices but a splayed 4-bolt is plenty strong for all but the most extreme hp applicatons. Evem a studded two bolt should be plenty strong for almost any n/a car. However I have seen pictures of a ford blocks which have broke straight down the cam and main journals.

 

I have the world products Motown 4-bolt main 350 in my 88', but it's a 2-piece rear seal. It's also not a roller cam block, and I didn't retro-fit it either.

 

we have more block options then anyone else.

Dart aftermarket blocks.
World producs Motown blocks
Chevys Bowtie race blocks

and of course, production blocks... 2 bolt or 4... roller or non, 1 piece rear main or 2....

then theres everything you can do to them

a short fill in the waterjackets helps and wont hamper the cooling needed for a street car...
you can take a 2 bolt main block and make it a splayed 4 bolt....


basicly, you just need to know how much power you plan to make, and how you plan to make it, and you can make a SBC to handle anything...

 

As everyone has said,

Dart, world products, motown, bowtie, and many alum. blocks as well such as donovan.

Your covered in that area, just have to decide which is best and if you really need an aftermarket block.

 

I want to do a stroker motor with a shot of nitrous....
If the 4 bolt factory can handle about 700 crank....than I 'll just use that.
I figure a 4 bolt production block prepped with forged internals should live for awhile....

Thanks for the reply..

 

3.75 stroke? sure....

anything over that is pushing your luck with a production block, but its been done.

 

You really don't need a 4-bolt, even with NOS. I got a good deal on my motown (I'd be just as happy with my old 350 roller block,) I'm sure there's many NOSing their 2-bolts with no problems.

 

You say you got a good deal on your motown?
They run around 2 grand or so prepped,from what I read....
It's not like I'd be spraying all the time...just at the track to get a number...Basically I'd like the stroker to make 500 or so at the crank,which I think a forged bottom end 4-bolt would support ...
I was just concerned on the shot of N20 once in awile....
The project is down the road but I'm trying to work these things out now..