adjustable vacuum advance

Barry Jackson · 12-19-2002, 07:35 AM

I tried my allen wrenches in the tube, but did not hit anything. Maybe not long enough? Are most durasparks adjustable?
Thanks,

PKRWUD · 12-19-2002, 07:48 AM

I've never seen a DuraSpark that was adjustable. Adjustable vacuum advance units are generally an aftermarket modification that you install.

red82gt · 12-20-2002, 04:36 AM

I've got two of 'em, one in my car and one in my parts bin. I got the one off a 78 Lincoln Versailles so I'd say it's a good chance it was stock. I've seen a few that aren't but I've had at least a half dozen that are adjustable so they do exist. I actually found this out from a guy at a speed shop when I went to buy an adjustable vacuum advance, he told me to try it first and because of that he lost a sale

.

red82gt · 12-20-2002, 04:42 AM

Oh yeah, if it is adjustable, you'll hit something with it only about 1/2" into the vacuum hose hole so it sounds like yours isn't adjustable. BTW the adjustable ones I've found have mostly been on 302's after 1978.

red82gt · 12-20-2002, 04:59 AM

Okay, I've got one here in front of me. If you put too small of an allen key in it then it will just poke right through (I guess the adjuster is hollow) so use the biggest allen key that will fit in the hole and it is about 3/4 of an inch deep in the hole (instead of 1/2" like I stated earlier).
BTW, it's got MOTORCRAFT cast into it so it's definitely stock.

12-19-2002, 07:35 AM	#1
Barry Jackson Registered Member Join Date: Oct 1998 Location: Pitts. Pa. USA Posts: 61	adjustable vacuum advance I tried my allen wrenches in the tube, but did not hit anything. Maybe not long enough? Are most durasparks adjustable? Thanks, __________________ 87 LX, 74 351W, performer plus intake, holley 750, vac sec., 78 prim. 80 sec., 50 pump: Wolverine cam 292-512, windsor heads, ported 3 angle valve, 4:10 rear, AOD, Lentech valve body w/ 10'' converter. No time slips yet!

12-19-2002, 07:48 AM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I've never seen a DuraSpark that was adjustable. Adjustable vacuum advance units are generally an aftermarket modification that you install. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

12-20-2002, 04:36 AM	#3
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	I've got two of 'em, one in my car and one in my parts bin. I got the one off a 78 Lincoln Versailles so I'd say it's a good chance it was stock. I've seen a few that aren't but I've had at least a half dozen that are adjustable so they do exist. I actually found this out from a guy at a speed shop when I went to buy an adjustable vacuum advance, he told me to try it first and because of that he lost a sale . __________________ 393W: AFR 205's, hydraulic roller, TKO600.

12-20-2002, 04:42 AM	#4
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	Oh yeah, if it is adjustable, you'll hit something with it only about 1/2" into the vacuum hose hole so it sounds like yours isn't adjustable. BTW the adjustable ones I've found have mostly been on 302's after 1978. __________________ 393W: AFR 205's, hydraulic roller, TKO600.

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12-20-2002, 04:59 AM	#5
red82gt Sober voice of Reason Join Date: Nov 1998 Location: Kelowna, B.C., Canada Posts: 1,514	Okay, I've got one here in front of me. If you put too small of an allen key in it then it will just poke right through (I guess the adjuster is hollow) so use the biggest allen key that will fit in the hole and it is about 3/4 of an inch deep in the hole (instead of 1/2" like I stated earlier). BTW, it's got MOTORCRAFT cast into it so it's definitely stock.