Vacuum advance for big cams
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Supreme Member
Joined: Oct 2004
Posts: 4,526
Likes: 238
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Vacuum advance for big cams
The stock vac advance on my distributor was hitting max advance at about 13"hg and I generally pull about 11". I wanted a rock solid advance at idle so after some searching I found AIRTEX is re manufacturing the B28 advances from the old corvette FI motors. It starts 3-5" and finishes about 8" the PN is AIRTEX 4V1053 and has B28 written on it. My Test showed full advance at 7".
So just a heads up for anyone with a bigger cam.
So just a heads up for anyone with a bigger cam.
Supreme Member
Joined: Jul 2007
Posts: 1,293
Likes: 5
From: Howard Lake, MN
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: Vacuum advance for big cams
i have a Crane adjustable vacuum can on my car... it uses an included allen wrench to adjust the vacuum level that it starts at, and a bolt on limiter with different steps to control how much..
Thread Starter
Supreme Member
Joined: Oct 2004
Posts: 4,526
Likes: 238
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: Vacuum advance for big cams
Yea I saw that but did not want to spend $40 when i could get exactly what I needed for $10
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