Intake Gaskets
#1
Intake Gaskets
I have a 92 RS 305 TBI (all stock), & I just removed the stock intake manifold b/c it had a tiny crack in the manifold at the front & coolant very slowly seeped out. The leak was so slow, that it only leaked about a 1/2 gallon of coolant every year (it only leaked in the summer months).
The car has always ran great & the manifold has been cracked for about 3 years, & I could've driven it for another 3 years like this, but I decided to replace the manifold b/c I had the time.
So after I removed the intake, I noticed that the rear head passage on each head had metal caps blocking them, & the new gaskets also have those passages blocked as well, but they are covered by gasket material.
Are those coolant passages that are blocked? Does anyone know what those passages are for & why they are blocked?
I bought the blue felpro gaskets.
The car has always ran great & the manifold has been cracked for about 3 years, & I could've driven it for another 3 years like this, but I decided to replace the manifold b/c I had the time.
So after I removed the intake, I noticed that the rear head passage on each head had metal caps blocking them, & the new gaskets also have those passages blocked as well, but they are covered by gasket material.
Are those coolant passages that are blocked? Does anyone know what those passages are for & why they are blocked?
I bought the blue felpro gaskets.
#3
Member
Join Date: Jun 2002
Location: Hockessin, Delaware
Posts: 491
Likes: 0
Received 0 Likes
on
0 Posts
Car: Red 91 RS Camaro
Engine: LO3 with Comp Cam
Transmission: 700R4
Axle/Gears: 4th gen rear
Re: Intake Gaskets
When you buy new gaskets they will be the same way, the two rear passages will be blocked off.
#4
Supreme Member
iTrader: (5)
Join Date: Jan 2009
Location: league city
Posts: 2,928
Likes: 0
Received 3 Likes
on
3 Posts
Car: SOLD!!!!!
Re: Intake Gaskets
if you buy felpro gaskets there will be holes in the gasket material for those rear passages. i purchased gm intake gaskets and the rear orfice was metal. they seem to work a lot better. here is the part number
12525810
12525810
#5
Re: Intake Gaskets
If these are coolant passages that are blocked off by the intake gaskets, do we need to remove the block off plates so that more coolant can flow through the intake?
I'm just not understanding why they are blocked off.
Does anyone know why the passages are blocked?
I'm just not understanding why they are blocked off.
Does anyone know why the passages are blocked?
#7
Re: Intake Gaskets
It forces coolant to flow from the front to back to warm the entire intake for good fuel atomization.
If your putting a stock intake back on, put stock gaskets on.
If your putting a stock intake back on, put stock gaskets on.
Trending Topics
#10
Supreme Member
iTrader: (5)
Join Date: Jan 2009
Location: league city
Posts: 2,928
Likes: 0
Received 3 Likes
on
3 Posts
Car: SOLD!!!!!
Re: Intake Gaskets
why are people saying they blocked them off. if you order the gaskets there is an orfice not a block off. you can get the gaskets that block them off but why. and it heats the intake a little more but i doubt a whole lot of mileage comes from it. prolly more of an air pocket thing to allow the coolant to run from the heads in front and back.
#11
Re: Intake Gaskets
The rear coolant ports that are blocked may have a small hole in the center to allow air to escape. Thats the way they came from the factory.
Look at the gaskets, they say "front" on them. I don't think he'd notice either way (w/ or w/out open ports), its more of a cold weather thing, like those tpi coolant hose to the throttle body.
Look at the gaskets, they say "front" on them. I don't think he'd notice either way (w/ or w/out open ports), its more of a cold weather thing, like those tpi coolant hose to the throttle body.
#12
Supreme Member
iTrader: (5)
Join Date: Jan 2009
Location: league city
Posts: 2,928
Likes: 0
Received 3 Likes
on
3 Posts
Car: SOLD!!!!!
Re: Intake Gaskets
i believe if the orfices were put in the front it would effect the coolant sensor. heck maybe the holes like they are is one of the reasons they are hard to bleed. i know when i went to carb and had them blocked off i didnt have to bleed the cooling system. since i went back i did have to bleed it out.
Thread
Thread Starter
Forum
Replies
Last Post
Hotrodboba400
Firebirds for Sale
3
12-10-2019 07:07 PM