I am curious what the difference between the two blocks are, their weak points. and what Long studding the block involves.

I have searched and not found much at all on these. I even searched the net.

thanks,
TF

 

The 200 block has reinforcements at various potential weak points. Made of a higher grade of Iron too.

ya want long studding then you MUST use a 200 block.

 

so a 205 is weaker? what about long studding one of them?

 

not all 205 blocks are weaker as the 500 used a 205 block

 

it has been reported many times that there is nothing wrong with using a 205 block upto a certain level of BHP i.e. 400 -450.

Also many people out there still use the 205 in big power cossies and have never had a issue. i think its mostly pot luck with any 200 or 205. you can get a good block or a crap one.

regards

Jay

 

any ideas what the build differences were between them?

I have also ran into 197 and 203 blocks. ? Unfortunatley I have never been able to sit them side by side (no space). I am also not familiar with structural stregth physics and stuff of that sort, so I might end up looking at the way they were built wrongly.


TF

 

The 197 and 203 are not Cosworth blocks. Put simply, the basic 205 (large core plug) block is the weakest. The RS500, small core, 205 block is the strongest, with a flex rating of around 780BHP. The 200 block is marginally weaker than the RS500 one.