Slant Six Forum
https://www.slantsix.org/forum/

318 bbd to much for stock six?
https://www.slantsix.org/forum/viewtopic.php?t=18591		 Page 1 of 1
Author:  64'4$peed [ Sat Jul 15, 2006 5:15 pm ]
Post subject:  318 bbd to much for stock six?
So I have a 318 BBD of unknown year. (If I could figure out how to post pics I would) I am assuming any 318 bbd might be too much carb for a stock 76' motor. should I save this carb for a different motor and look for a 225 specific BBD?

Also this carb has a whole bunch of vacuum fittings. 4-5 not counting dist. adv. and choke diaphragm. too vague a description or is this a common carb. there is a big fitting made out of plastic that the accelerator pump passes through if that helps
Author:  VG-265 [ Sat Jul 15, 2006 5:22 pm ]
Post subject: 
Not sure about that carb, but the BBD will work well on a stock slant. The Aussie 2 barrel engine used a cam slightly different to the single barrel ones, but I have been told the later engines like your '76 had this cam standard. Finding the manifold and linkages seems to be a bit difficult over there though.
Author:  Reed [ Sat Jul 15, 2006 6:47 pm ]
Post subject:  Re: 318 bbd to much for stock six?
Quote:
So I have a 318 BBD of unknown year. (If I could figure out how to post pics I would) I am assuming any 318 bbd might be too much carb for a stock 76' motor. should I save this carb for a different motor and look for a 225 specific BBD?
Quote:
Also this carb has a whole bunch of vacuum fittings. 4-5 not counting dist. adv. and choke diaphragm. too vague a description or is this a common carb. there is a big fitting made out of plastic that the accelerator pump passes through if that helps
VG-265 got it right. The Super Six two barrel option used a BBD which was modified slightly to work with a slant six. The cams are the same between the 71-80 one barrel slants and the 77-80 two barrel slants (81 they changed to hydraulic cams).

Here's the vacuum ports:
Image

I woudl like to see pictures of this since I have never heard of a plastic fitting like you describe.
Author:  sandy in BC [ Sat Jul 15, 2006 8:35 pm ]
Post subject: 
A 318 BBD works fine on anything from stock to fairly hot. I had one on my bagged stock 225 and it worked fine. It stayed when I rebuilt the 225....now with Comp 264 , 9.25CR and Big Valves. I didn t change a thing except I recurved the distributor. They are actually very forgiving little carbs.
Author:  SlantSixDan [ Sat Jul 15, 2006 11:11 pm ]
Post subject: 
The plastic fitting is the fuel bowl vent. If you have a pre-1971 (Federal) pre-1970 (California) car, just leave it open (no hose/no plug). If you have a '70-up (California) '71-up (Federal) car, connect it to the same hose your present fuel bowl vent is connected to (charcoal cannister on '72-up cars, hose to fuel pump body nipple on '70-'71). BBDs past about 1978 don't have an external bowl vent, which is why Reed's pic doesn't show one.

Reed, here's a pic (this is a GM unit with body-mounted choke):

Image
Author:  Reed [ Sat Jul 15, 2006 11:14 pm ]
Post subject: 
Ohhhhhhhhh. I HAVE seen one of those before. I just wasn't getting it from the description. Thanks Dan!
Author:  wycowboy [ Sun Jul 16, 2006 5:17 am ]
Post subject: 
I am currently running a BBD from a 318 on the slant in my 87 W150 and have run a Holley 2 barrel from a 318 in the past with no problems.

Chris
Author:  Sam Powell [ Sun Jul 16, 2006 6:49 am ]
Post subject: 
There is a fair amount of tuning possible with the BBD. You can raise and lower the tapered metering rods with a pair of set screws under that top bowel vent, and it will change the enrichment rate as vacuum falls off. Play with it, and see how performance changes and economy..
Sam
Author:  64'4$peed [ Sun Jul 16, 2006 10:13 am ]
Post subject: 
thats the carb Dan. minus the body mounted choke. As for the other fittings on the carb. do I need to cap and plug the ones I wont be using?
Page 1 of 1 All times are UTC-08:00
Powered by phpBB® Forum Software © phpBB Limited
https://www.phpbb.com/