Re: 56 Caribbean fuel starvation

Posted by PackardV8 On 2008/8/29 16:45:45

Also, it is not always reliable to do the blow thru test on filters even if u let them dry out first. Try a new filter or just a few test runs with NO filter. An 88 F ranger 2.0 4cyl (carb) filter can be easily addapted to the single carter 4bbl without removing original filter unit. I don't know about the Carib dual quad set up tho.

The 4#'s on the output of fuel pump sounds a bit weak to me but i havn't looked in the manual yet for specs.

My very original 56 Exec with 352 has always had low manifold vacuum too. Did a valve job and no improvement. My guess is that it has something to do with valve timing. So Packard may have been sloppy with timing gears. Just a guess. I have not checked the valve timing yet.

As a side remark. I would seriously consider removeing the dual quad set up and build a glass display case arounf it. A 350 cid engine has a 100CFM draught per 1000 rpm. So unless u plan on turning the engine up over 4000 rpm AND HOLDING THERE SUSTAINED then any 400-500 CFM carb will be more beneficial than the dual quad set up. Mite cure your low manifold vacuum too altho the low vacuum is probably a non issue. Many of the road course racing machines (N'Burg, Lemans, sebring etc) engines will run low manifold vacuum due to valve timing. Check the vacuum at 3k to 4k sustained rpm in high gear on level ground for a mile or two to see if it picks up to the 20 to 22 inHg. I've never checked mine at that speed yet.