big block questions

[bigbadchev84]

i have a 396 out of a 1966 chevelle super sport that says it is 425hp stock, but im not sure what has been done/changed in it. it has been sleeved proffesionally to .60 overbore-so what cid am i at now? i am also looking for a cam recomendation for it, it will most likely have a stick behind it with 4.56gears and either 38s or my 39.5s. it sees mostly roads and the weekend mud pits occasionally, what would be my best bet? also i need a good source on a used pully/bracket set-up for a big block, ebay is outrageous! also i need to find a truck oil pan for it, everything on ebay looks like car stuff.

 

[PhoenixZorn]

Should be around 406CI with that .060 overbore, but it could be anywhere from 401-408CI... I'm not really sure. If everything was "upgraded" with the overbore, you should be pushing around 450hp with a 425hp stock motor... if things were really upgraded, you could have as much as 550hp and still be streetable in a Chevelle... (just for reference) In your truck, it would be fun as hell. =)

 

[thor]

It's a 408. For cam recommendations, we need the head casting # and piston # if available. this is probably 11:1 which will need a big cam to keep cylinder pressure in check. It also will have rectangle ports that will lower your torque below 5K rpm. You can swap to a set of 781 casting oval ports to drop the compression and pick up some torque.

Pulleys off any 454 pick up are the cheapest and most plentiful (and still available from gm), but require a 69&up long water pump. Alternator brackets I'd get the cheap chrome jobbies, strip and paint em if you like.

Power steering brackets for a long water pump are still available from GM, If you have a decent local dealer.... If not the prices below are from GMpartsdirect.com, but they make up for it with shipping.

GM part #
14015391 $6.83
3967422 $12.21

I may have an extra pan, some heads, and a water pump laying around.

 

[thor]

P.S. If that was infact out of a chevelle it would be 375 hp maximum. The 425 horse 396 was a vette only deal. Either is worth a lot of money to restorers. You could sell it and get a really nice 454.

 

[bigbadchev84]

OK THE HEADS ARE-3856206THEY ARE 1965-66 OVAL PORT/CLOSED CHAMBER/97CC
THE BLOCK-3902406 IT IS A 1967/396/4BOLT BLOCK BORED .60 OVER DOMED PISTONS, CRANK AND RODS ARE .10 UNDER, I AM LOOKING FOR A TRUCK OIL PAN AND BRACKETS/PULLEYS, I CANT AFFORD A MEMBERSHIP RIGHT NOW, BUT IF SOMEONE MIGHT HAVE SOMETHING LAYING AROUND PLEASE EMAIL ME AT [email protected] THANKS

 

[bigbadchev84]

somebody has to have some information for me, where you guys at??

 

[bigbadchev84]

come on guys somebody has to have some bbc info for me

 

[tarussell]

Well it is most definetely not a complete O.E. 375HP motor with those heads - they used the rectangular port closed chambers in the mid sixty's.
You could use those heads but like said up above the larger chamber 781's or 049's will perform very well for what you say you want to do .
A cam recomendation that might work good for you is a Crane grind # 282 H08and part # 103072 . It's 226 @ .050 with .533 lift on a 108 lobe sep. this cam has the low end balls and the upper power band that a heavy 4x4 needs to get things done.
Tom