stock 400 cam upgrade question.
 

I have a 86 baja 320 with 400's, someone got rid of the q-jets and put on holley 750's, I now have to rebuild one engine due to a oil gauge line breaking last weekend, ran out of oil before I cought it, sounds like a spun rod bearing, I will be doing both engines so I know they are the same, I don't want to get crazy since I know it takes alot to make a 32 ft straight hull fast, I was going to get suggestions on what cam may be a nice "cheap" couple of hp with the stock heads, or should I leave them alone.

the engines were supposedly 420hp but it is tagged as 400's.

one engine was redone 2 yrs ago, that is the one they had the issue, I wonder is there a cam difference between the 400 and the 420? or is it just the carb and intake setup?
The rebuilt engine sounded like it had a tad more cam in it then the stock engine.
Another reason to do both is to make sure both have the same cam.

400/420/525SC all have the same cam.
Its a Crane #132561.

Isn't a 525 a roller cam engine?

the new 525 is a roller camed engine. Griffs post is refering to a 525sc wich was a 420 w/ 250 blowers. Up grade to roller cams if you can swing the cash it will be well worth it.

I figured something like that, someone told me they were roller, I just assumed he meant roller rockers, they do have the gold roller rockers, I will do roller probably later, I did not want to do the engines this yaer but my oil line made me, I had alot of other things that needed to be done so these have to be redone on a budget, good thing I do all my own work!! All I need to pay for is machining/parts

525SC uses the same flat tappet cam. It does have gold crane roller rockers as does a 420. Not sure about the 400 having roller rockers, but it should due to the cam lift.

BTW, a 525SC is a little more than a 420 with blower(its a weiand 177) on top. They were hand assembled and balanced at merc racing. Lower CR, inconnel valves, etc.

Mine have the roller rockers, I am not sure what valves are in it though.