Intake manifold Gasket help...

[Keitha]

I am assembling my top-end and have a question about the intake manifold gasket.
I have a TBI motor with the stock manifold and the gasket they gave me at the parts store is a FelPro 93317. Everything looks OK except that the gasket has the Rear Restricted Port where the one that came off is open. This is the rear port on the head/manifold that runs across the manifold and leads to the heater core fitting.

Should I find a different gasket, drill out this part of this gasket, or run it as it is?

thanks,
Keith

 

[Jason4x4]

run it, it's supposed to have it. everyone I've ever seen has it.

 

[Keitha]

run it, it's supposed to have it. everyone I've ever seen has it.

Does it affect the heater in any way? Living in Southern California I really need my heater actually I do as I take the Fam to Mammoth etc.

thanks,

 

[Jason4x4]

nope, IIRC, water still flows through the intake from front to back anyway.

 

[4X4HIGH]

I would recommend the Fel-Pro 1204 gasket with open water crossover passages. This is what i run on my TBI manifold. The port size is 1.230" x 1.990" x .060" thick.

http://store.summitracing.com/partdetail.asp?part=FPP%2D1204&autoview=sku

 

[05typeRSX]

Don't forget to use silicone to seal the lifter valley ends. From what I have been told, this is the new standard procedure for all small blocks that come in for dealer service. Just throw the rubber(sometimes cork) end seals away and use a good silicone to seal the manifold to the block. I prefer the gray import grade silicone because it hardens up more than the blue or black stuff. Never had the stuff fail in almost 7 years on my Blazer and I run a 400 with an Edelbrock Performer EPS.

 

[4X4HIGH]

Yep, definately toss the end gaskets and run RTV, i like to use Ultra Black. I've been doing this for 22 years now without a hiccup.

 

[Keitha]

Right-on!
I made the mistake of running the end gaskets once.... once!
Thanks for all the advise. Hopefully I can get this thing installed after work today.

 

[Keitha]

I would recommend the Fel-Pro 1204 gasket with open water crossover passages. This is what i run on my TBI manifold. The port size is 1.230" x 1.990" x .060" thick.

I will go with this gasket. Just curious: Could you explain what the open vs closed crossover passage affects? How does the coolant flow through the block/intake?

What do you do about the exhaust heat crossover? Blocked or open?

thanks again,

 

[dyeager535]

Exhaust crossover blocking will disable your EGR, so based on your location, I assume that's a no-go.

 

[4X4HIGH]

Exhaust crossover blocking will disable your EGR, so based on your location, I assume that's a no-go.

My bad, gave the wrong info.

I meant to say Fel-Pro 1256. The 1256 is the same gasket but with the exhaust crossover.

http://store.summitracing.com/partdetail.asp?part=FPP%2D1256&autoview=sku