Intake Exhaust Crossover Block Off - What Side
#1
Member
Thread Starter
iTrader: (3)
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 218
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Pontiac Trans Am
Transmission: BW T5, Hurst Short Throw Shifter
Axle/Gears: 3.70 Posi
Intake Exhaust Crossover Block Off - What Side
Does it matter which side (head or intake manifold), the metal exhaust crossover block off plates are installed? Should it be head, block off plate, intake gasket then intake manifold or head, intake gasket, block off plate then intake manifold?
Thanks.
Thanks.
#2
Supreme Member
Join Date: Mar 2008
Location: CT
Posts: 1,549
Likes: 0
Received 1 Like
on
1 Post
Car: 86 T/A, 83 Z/28
Engine: 5.0 TPI, 350 2 X 4 bbl
Transmission: 4 speed auto, 5 speed manual
Axle/Gears: 3.23 posi, 3.73 std
Re: Intake Exhaust Crossover Block Off - What Side
You mean restrictor right? You probably dont want to block off the exhaust cross over because that will lead to some drivability issues. Now if your talking about the restrictor then it does matter which side you put it in and is specified in the instructions which applications used them and on which side they were used.
#3
Moderator
Join Date: Jul 1999
Location: 51°N 114°W, 3500'
Posts: 17,108
Likes: 0
Received 120 Likes
on
101 Posts
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Intake Exhaust Crossover Block Off - What Side
If you have headers then it doesn't matter what side has what kind of plate over the crossover holes. If you don't want the exhaust gasses to help warm up the carb then block off both holes.
With factory style exhaust manifolds, it's always been common to have the exhaust heat riser valve on the passenger side manifold. This valve is closed when the exhaust is cold and will open up once it gets warm. With the exhaust closed off or at least restricted, the exhaust gases are forced into the intake crossover. The passenger side head opening is open or restricted and the drivers side head is blocked off or restricted.
It doesn't matter which side of the gasket you put the plate on.
With factory style exhaust manifolds, it's always been common to have the exhaust heat riser valve on the passenger side manifold. This valve is closed when the exhaust is cold and will open up once it gets warm. With the exhaust closed off or at least restricted, the exhaust gases are forced into the intake crossover. The passenger side head opening is open or restricted and the drivers side head is blocked off or restricted.
It doesn't matter which side of the gasket you put the plate on.
#4
Member
Thread Starter
iTrader: (3)
Join Date: Mar 2009
Location: Ontario, Canada
Posts: 218
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Pontiac Trans Am
Transmission: BW T5, Hurst Short Throw Shifter
Axle/Gears: 3.70 Posi
Re: Intake Exhaust Crossover Block Off - What Side
Thanks very much for the responses....it is greatly appreciated!
Thread
Thread Starter
Forum
Replies
Last Post
1992 Trans Am
History / Originality
27
05-10-2023 07:19 PM
Terrell351
Engine/Drivetrain/Suspension Parts for Sale
5
06-13-2021 01:13 PM
transaero
Engine/Drivetrain/Suspension Parts for Sale
2
08-31-2015 01:14 AM