6 Bolt Head on a 2G Block???

[james242k2]

I have a 6 Bolt cylinder head that I was thinking of putting on my 2G short block. The reason I am doing this is because I want to rebuild my 2G cylinder head and this is my daily driver. So I can't be down for more than a day or two. Is this easy to do? How much more will this cost to accomplish? Would it be better to trade my 6 Bolt Head with someone Else's 2G Head? Any advise would be appreciated.

 

[ZmanIV]

why would you want to do this?
do some more research. I would personally put the 2g head onto the 2g shortblock.

 

[larsrya8]

http://www.dsmtuners.com/forums/showthread.php?t=182417&highlight=1G+Head+2G+block

 

[95AWD_TSI_TALON]

To put a 1g head on a 2g you will need
-1g head
-1g CAS
-1g thrermostat housing
-1g water pipe (91-92 w/ non external oil cooler)
-1g lower radiator hose
-1g intake manifold

Kinda a PITA especialy to do only as a temp set-up
Matthew

 

[brryder]

I did that swap 2 months ago. Here is what I used:

1G head
1G CAS
1G thermostat housing and water pipe

You could reuse all off you hoses, intake manifold, and other misc thing. Ideally you want to use the 1G intake manifold and cut off the counter-weigth on the shifter bracket by the tranny. It may sound complicated, but it's just as simple as putting another 2G head in.

Adriano

 

[DSMJim]

http://www.dsmtuners.com/forums/showthread.php?t=182417&highlight=1G+Head+2G+block

What sort of scientific proof has "look at it" been turned into? What makes you think that you will gain HP with a 1G head over a 2G head just because the intake runners are larger?

The larger runners on a 1G head have a much larger angle into the valve, this actually slows the air entering the cylinder chambers. Generally on a port job of a normal head for racing they raise the chambers not lower them so the entry into the valve is a straight as possible. The angle into a 1G head is horrible because the port is so low already in the head.

The HP increase from a 2g head to a 1g head is from the Cams, and Intake manifold. If your using aftermarket cams and plan on buying a SMIM don't put on a 1g head because you'll end up with no gain and a head that has horrible port design.

Most major racers now using DSM's are using a 2G head and 2g style intake manifold and raising the runners in V8 styles so the air is hitting the top of the valve as straight on as possible. Air flow has nothing to do with the size of the chamber and EVERYTHING to do with the shape and design.

Putting a 1g head on a 2g block is the OPPOSITE of what you want to do. Replace your 2g block with a 1g block and keep your 2g head. Have it ported and port raised and add a set of HKS or Comp cams with a SMIM. This will provide you with a much more potent street engine.

 

[spidy3]

When I asked about putting a 2g head on a 1g block, I was told that the head stud holes were smaller and the 2g and would have to get them opened up in order to make the head fit.

For James' question, would he have any issues with the holes that the head studs go thru on a 1g head being too big to go on a 2g block with 2g head studs?


Dom

 

[95AWD_TSI_TALON]

When I asked about putting a 2g head on a 1g block, I was told that the head stud holes were smaller and the 2g and would have to get them opened up in order to make the head fit.

For James' question, would he have any issues with the holes that the head studs go thru on a 1g head being too big to go on a 2g block with 2g head studs?


Dom

Yes you have to drill them out. 6 bolt motors are 12mm head studs, 7 bolt motors are 11mm head studs.

No problem, using a 6 bolt head on a 7 bolt. There are two dowel pins in the block that line everything up.
Matthew

 

[JiveMasterT]

Yes you have to drill them out. 6 bolt motors are 12mm head studs, 7 bolt motors are 11mm head studs.

No problem, using a 6 bolt head on a 7 bolt. There are two dowel pins in the block that line everything up.
Matthew

which means you can never go back to a 2g head... since you just drilled out your block.

 

[luvmygst]

I think you enlarge the holes in the head not the block. It would be hard to drill the block to accept 11mm studs when you have a 12mm hole already.(j/k)

 

[destruckeclipse]

I think you enlarge the holes in the head not the block. It would be hard to drill the block to accept 11mm studs when you have a 12mm hole already.(j/k)

The holes in the 6 bolt head are bigger then the holes in the 7 bolt block. You got it backwards there.

 

[ZmanIV]

which means you can never go back to a 2g head... since you just drilled out your block.

Do some more reading on the 2G head onto a 1G block before you make a statement like this.

 

[DSMJim]

If you use ARP studs they go through both heads without drilling. The 1g head studs are only 12mm vs 11mm for the 2g. The head is centered on the block with dowels so the studs do not do the centering, therefore they are not tight on the head no matter what. They studs will fit through either head no problem.

This is an age old myth about dsm's, forget this drilling business you don't have to drill anything. Honestly I don't know who started that but it's not true. You use head studs to match the type of block you use, either head will slide on. (I use the term slide because head studs make heads hard to go on no matter what, get out the rubber mallet)

 

[95AWD_TSI_TALON]

If you use ARP studs they go through both heads without drilling. The 1g head studs are only 12mm vs 11mm for the 2g. The head is centered on the block with dowels so the studs do not do the centering, therefore they are not tight on the head no matter what. They studs will fit through either head no problem.

This is an age old myth about dsm's, forget this drilling business you don't have to drill anything. Honestly I don't know who started that but it's not true. You use head studs to match the type of block you use, either head will slide on. (I use the term slide because head studs make heads hard to go on no matter what, get out the rubber mallet)

Jim, I know your DSM knowledge. But I have personally put 3-2g 7 bolt heads onto 6 bolt shortblocks. Not all of the holes are the same size on the head. Yes the 12mm ARP head studs fit through SOME of the holes , But I garentee that the 2g 7 bolt head has issues with individual ARP's going through let alone getting the head to slide down over all 10 at once.
Matthew

 

[DSMJim]

Jim, I know your DSM knowledge. But I have personally put 3-2g 7 bolt heads onto 6 bolt shortblocks. Not all of the holes are the same size on the head. Yes the 12mm ARP head studs fit through SOME of the holes , But I garentee that the 2g 7 bolt head has issues with individual ARP's going through let alone getting the head to slide down over all 10 at once.
Matthew

I guess I can squese my bolt through tigher holes than you can.

It's a tight fit, but with some patience and a rubber mallet it will go down (go down.. hahahah. Ok I have been drinkin, bad time to post..)

 

[ZmanIV]

It's a tight fit, but with some patience and a rubber mallet it will go down (go down.. hahahah. Ok I have been drinkin, bad time to post..)

DSMJim ""THE HAMMER"

 

[95AWD_TSI_TALON]

I have tried "man handeling" it to get it in before. But still ended up having to drill it (wow reading that looks SOOOO dirty, by the way what you drinking Jim?....Morgan/coke here...about to be over their in the toilet tho....)