[Elroy]

Guys -

I have a 1970 429 block that is supposed to be 429 CJ, but it has only 2 bolt mains. Was it in '71 that 4 bolt mains came into play - and if so, how can I tell for sure what the block is?

Or did the DOOE heads and intake make the block a SJ n 70?

Thanks!

 

[Hawk1]

Hi Rodney,

You are right that the 1970 429 CJ had two bolt mains and the 1971 429 CJ came with the 4 bolts mains. Yes I would look at the heads and the intake. The 429 CJ ports measure 2.12 x 2.86 inch on the intake side vs. 1.85 x 2.56 for the standard 429.

All the best,

 

[cougarshaman]

Yep. ^
Get the casting number off the block and decode it, since that's a much better indication of what you really have.

 

[blackcat429cj]

More info from the 429cj megasite - http://429mustangcougarinfo.50megs.com/components_3.htm note 70 429SCJ blocks are four bolt blocks as well as 71PI possibley 72PI.

 

[Elroy]

More info from the 429cj megasite - http://429mustangcougarinfo.50megs.com/components_3.htm note 70 429SCJ blocks are four bolt blocks as well as 71PI possibley 72PI.

OK - this made it clear. It is a D0VE-A block. The "D0VE" part of it threw me off!

Thanks all!