Additives in gas 72 BB
Thread Starter
Racer
Joined: Jun 2015
Posts: 315
Likes: 20
From: Vasteras, Sweden
Additives in gas 72 BB
I have tried to get an answer for this...
Do i need additives in gas for my 72 BB or were the valve seats fixed for this in 1972?
Using additives now but it would be nice to know if i really need it!
Do i need additives in gas for my 72 BB or were the valve seats fixed for this in 1972?
Using additives now but it would be nice to know if i really need it!
Burning Brakes
Joined: Jan 2007
Posts: 968
Likes: 122
From: Lighthouse Point FL
Were valve seats hardened in ‘72? Unleaded wasn’t required yet, so I doubt they were. A lead additive might be in order. The ethanol isn’t good for your factory fuel,system either.
The guy working on my Vette (‘69 427/390), who does restorations for a living, said to avoid pump gas with ethanol. He said to run Avgas and add 6oz of Marvel Mystery for every full tank.
The guy working on my Vette (‘69 427/390), who does restorations for a living, said to avoid pump gas with ethanol. He said to run Avgas and add 6oz of Marvel Mystery for every full tank.
Last edited by maj75; Oct 15, 2017 at 11:00 AM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
w/mel
IF those seats are original they are probably beat/sunk anyways
if it really bothers you VP, Torco makes additives that work; wild bills octane supreme has lead and really does help
most the auto parts store stuff is useless period.
A bottle per tank isnt a big deal if youre a weekend driver
IF those seats are original they are probably beat/sunk anyways
if it really bothers you VP, Torco makes additives that work; wild bills octane supreme has lead and really does help
most the auto parts store stuff is useless period.
A bottle per tank isnt a big deal if youre a weekend driver
Last edited by cv67; Oct 15, 2017 at 05:24 PM.
Safety Car
Joined: Apr 2006
Posts: 4,057
Likes: 421
From: BC
I run 91 octane no ethanol in my 69 big block. Never had a problem and when I refurbished the original heads the seats were in great shape. No additives used.
Drifting
Joined: Nov 2016
Posts: 1,963
Likes: 579
From: Pittsburgh PA
The original owners manual to my dads 71 chevelle talks about the “improvements” to the engine for the 1971 model year so it could run unleaded gas. If GM put it in the manual, then they are probably fine
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Drifting
Joined: Mar 2011
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From: Kernersville NC
Melting Slicks
Joined: Sep 2006
Posts: 2,815
Likes: 470
From: Wichita Kansas
But, since I don't put that many miles on my '72, I change the oil after 3,000 mi. or once a year.....
Last edited by kansas123; Oct 15, 2017 at 09:19 PM. Reason: add information
Safety Car
Joined: Apr 2006
Posts: 4,057
Likes: 421
From: BC
Those days along with 24 lbs air pressure in the tires are long gone I guess. Thankfully.
Last edited by CanadaGrant; Oct 15, 2017 at 11:00 PM.