Compacted Graphite Little M Block ???

1997bird · 11-04-2009, 03:00 AM

Hi, I'm new to Dart's website. I'm considering Darts availible compacted graphite iron Little M block for my 1997 Trans Am WS6. To get the dome volume that I want I need to go to a 4.185" bore size, but want to keep as much strength as I can. I will be running the car on a methanol EFI system with a nitromethane injection kit while at the track. I would also like to run a 55mm cam core if there is enough room in the cam tunnel for the roller cam bearings. Thanks in advance for all of your responces!!

Shane

kevin@dart · 11-04-2009, 02:36 PM

Our CGI block will add around 30% more strength than our traditional casting.

As for cam tunnel we suggest a max of 50mm.

To do a 55 you have to bush the lifter bores which gets expensive.

1997bird · 11-04-2009, 04:38 PM

Quote:

Originally Posted by kevin@dart

Our CGI block will add around 30% more strength than our traditional casting.

As for cam tunnel we suggest a max of 50mm.

To do a 55 you have to bush the lifter bores which gets expensive.

Thanks for the info Kevin! I was planning on having the lifter bores modified for a .903" lifter diameter, sorry I forgot to post this info. Is this the same work that you were describing?

kevin@dart · 11-05-2009, 03:07 PM

No,

We have a few options for optional lifter bores. We can enlarge them without a bushing, or insert a standard bushing, or a keyed bushing.

When running a 55 mm cam tunnel you run a very probable risk of exposing enough of the lifter out of the bottom of the bore to cause an internal oil leak.

To remedy this we install a bushing that hangs down enough to remedy the situation. Typically this is a $700+ option depending on the block.

Last time we did one we ran into a water jacket.... So we do NOT bore to 55mm.

If you want that large of a cam you should go to our Iron Eagle block.

1997bird · 11-05-2009, 05:15 PM

Thanks for your additional help and info Kevin.

11-04-2009, 03:00 AM	#1
1997bird Status: Established Member Join Date: Nov 2009 Posts: 124	Compacted Graphite Little M Block ??? Hi, I'm new to Dart's website. I'm considering Darts availible compacted graphite iron Little M block for my 1997 Trans Am WS6. To get the dome volume that I want I need to go to a 4.185" bore size, but want to keep as much strength as I can. I will be running the car on a methanol EFI system with a nitromethane injection kit while at the track. I would also like to run a 55mm cam core if there is enough room in the cam tunnel for the roller cam bearings. Thanks in advance for all of your responces!! Shane Last edited by 1997bird; 11-04-2009 at 03:04 AM.

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11-04-2009, 02:36 PM	#2
kevin@dart Status: Moderator Join Date: Oct 2009 Location: dart heads Posts: 59	Our CGI block will add around 30% more strength than our traditional casting. As for cam tunnel we suggest a max of 50mm. To do a 55 you have to bush the lifter bores which gets expensive.

11-05-2009, 03:07 PM	#4
kevin@dart Status: Moderator Join Date: Oct 2009 Location: dart heads Posts: 59	No, We have a few options for optional lifter bores. We can enlarge them without a bushing, or insert a standard bushing, or a keyed bushing. When running a 55 mm cam tunnel you run a very probable risk of exposing enough of the lifter out of the bottom of the bore to cause an internal oil leak. To remedy this we install a bushing that hangs down enough to remedy the situation. Typically this is a $700+ option depending on the block. Last time we did one we ran into a water jacket.... So we do NOT bore to 55mm. If you want that large of a cam you should go to our Iron Eagle block.

11-05-2009, 05:15 PM	#5
1997bird Status: Established Member Join Date: Nov 2009 Posts: 124	Thanks for your additional help and info Kevin.