Hei distributor canister - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tino0217 · 10-31-2020, 02:59 AM

I have a 350 small block between 74 and 78 is the year and the vacuum canister makes the distributor cap lean it doesn't sit flush. Without pointing out the obvious do I have the wrong distributor cap is there some type of distributor cap that has a gap or something that allows the distributor cap to sit flush an even without any interference from thevacuum canister? I compared it to the old one that I took off and they look identical I see no difference. but older distributor cap was black and I never noticed if it was not sitting flush or not this new distributor cap is brown and I do notice that it does not sit flush

RustyPile · 10-31-2020, 03:52 AM

If the vacuum advance control unit is the source of the distributor cap "lean", more than likely the vacuum advance control is improperly installed. The unit should fit down flat on it's mounting surface. On the rim of the distributor cap near one the screw hooks is a square "nub" that fits in a square notch on the distributor.. If the cap's nub isn't properly aligned and inserted into that notch, the cap will lean...

Willys_MB · 10-31-2020, 07:35 AM

I had a similar problem with my HEI. All I did was move the spark plugs over by one and now I have plenty of clearance. You’ll have to reset the timing and do it at TDC, but it looks better now 😊

**HO455** · 10-31-2020, 12:26 PM

We need pictures to help with this one.

10-31-2020, 02:59 AM	#1
tino0217 Registered User Join Date: May 2017 Location: Seatac, wa Posts: 172	Hei distributor canister I have a 350 small block between 74 and 78 is the year and the vacuum canister makes the distributor cap lean it doesn't sit flush. Without pointing out the obvious do I have the wrong distributor cap is there some type of distributor cap that has a gap or something that allows the distributor cap to sit flush an even without any interference from thevacuum canister? I compared it to the old one that I took off and they look identical I see no difference. but older distributor cap was black and I never noticed if it was not sitting flush or not this new distributor cap is brown and I do notice that it does not sit flush Last edited by tino0217; 10-31-2020 at 03:09 AM.

10-31-2020, 03:52 AM	#2
RustyPile Registered User Join Date: Dec 2017 Location: Elkhart, Texas Posts: 1,853	Re: Hei distributor canister If the vacuum advance control unit is the source of the distributor cap "lean", more than likely the vacuum advance control is improperly installed. The unit should fit down flat on it's mounting surface. On the rim of the distributor cap near one the screw hooks is a square "nub" that fits in a square notch on the distributor.. If the cap's nub isn't properly aligned and inserted into that notch, the cap will lean...

10-31-2020, 07:35 AM	#3
Willys_MB Registered User Join Date: Apr 2017 Location: Boise, ID Posts: 856	Re: Hei distributor canister I had a similar problem with my HEI. All I did was move the spark plugs over by one and now I have plenty of clearance. You’ll have to reset the timing and do it at TDC, but it looks better now 😊 __________________ 1968 GMC C2500 Long Bed Fleetside

10-31-2020, 12:26 PM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: Hei distributor canister We need pictures to help with this one. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377



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