Big Block aluminum heads

[jasonasher70]

I recently acquired a pair of never used big block aluminum heads that were cast in 1996. The number on the heads are p-4532134. I would like to know if anyone has any technical info on these heads. I am considering using them for my next engine rebuild on my 440 bracket racecar. I now have a pair of 906 cast heads and assume they will bolt right on.It appears that an ordinary pair of Harland Sharp rockers and shafts will work. I don't think that offset rockers or anything are necessary. Any performance info. available would be appreciated. thanks

[fat 360]

I'm not a big block guy,but I'm thinking stage VI.

[cudabob496]

From what I can tell, that is not a correct head part number. But I only have a few sources.

[jasonasher70]

I'm hoping my heads aren't stage VI due to some of the reading I have done on varius sights. Everyone talks about intakes not fitting up properly and using spacers and such with stage VI. Other people talk like they are pretty raw heads that needed more machine work and extra care to even use. My heads look well put together and appear to have all the port work done and everything.You can see where they have been scribed and ported. I took the old "Dove" brand rockers and shafts off of my cast heads and they look like they would work well. Does anyone know when the stage VI heads came out? Mine have a casting date on them that says 1996. Are the stage VI heads just a street use head or do people use them for dragracing like I do. My car is 440 stroked pushing 800hp with the cast heads, I'm wondering whether I should even use them. Later.

[cudabob496]

Originally Posted by jasonasher70

I'm hoping my heads aren't stage VI due to some of the reading I have done on varius sights. Everyone talks about intakes not fitting up properly and using spacers and such with stage VI. Other people talk like they are pretty raw heads that needed more machine work and extra care to even use. My heads look well put together and appear to have all the port work done and everything.You can see where they have been scribed and ported. I took the old "Dove" brand rockers and shafts off of my cast heads and they look like they would work well. Does anyone know when the stage VI heads came out? Mine have a casting date on them that says 1996. Are the stage VI heads just a street use head or do people use them for dragracing like I do. My car is 440 stroked pushing 800hp with the cast heads, I'm wondering whether I should even use them. Later.

I believe stage VI were made so that a spacer was not needed.

[cudabob496]

Flow and power capability of different heads:

http://users.erols.com/srweiss/tablehdc.htm#Chrysler

[DartGT66]

Stage VI's needed a spacer if they used the original width intake. I think they started to make them around 1990, I bought mine in 1992. For a short while Mopar Performance had an aluminum street head available that was pretty much like the Stage VI design, but not with raised intake ports, and therefore no need for spacers. The Stage VI's have considerably raised intake ports the difference is clearly visible. I highly doubpt you are able to make 800 hp with Stage VI's without enormous modifications. Our 451 street engine made 649 hp at 6000 with excellent low end torque. The ports are relatively small (like all stock port window BB heads), and they don't flow that well, but perform excellent.

[bulldog426]

Originally Posted by jasonasher70

. My car is 440 stroked pushing 800hp with the cast heads, I'm wondering whether I should even use them. Later.

what you got done to those 906s?

[rampage_82]

A lot of No2 or forced induction would be my guess... I've seen 600hp be plausible, but not 800 naturally aspirated through factory castings.... heck I would even find that number hard to get out of fully worked over Max Wedge's....

[cudabob496]

Only the dyno knows for sure!!!