intake gaskets

[ecoman]

intake gaskets help

hello,i am new to this forum and have found it very helpfull. just purchased my fist corvette a 89 coupe a couple days ago it started missing on #3 cyl cheched compression ok checked vacucum only 14in also had oil leak at rear of engine anyways decided to replace the intake gaskets. after i bought the gasket set noticed the old gaskets had the rear coolant passages open and the new set have them restricted which are correct?

89 coupe
air foil
performance chiphttp://corvetteactioncenter.com/forums/attachment.php?attachmentid=4444&stc=1
excel coilhttp://corvetteactioncenter.com/forums/attachment.php?attachmentid=4445&stc=1
open air box

 

[Moonunit 451]

Welcome to the forum

Why don't you post some Pics if you can. Fact is, Throw the front and rear gaskets away for the intake. and use The Right Stuff gasket material instead. Approx. 3/8" bead. Do a search for intake replacement or instalation and you'll find all the info.

 

[ecoman]

thanks for the repy.but i am refering to the rear coolant passages on the heads.the old gaskets had the passages wide open the new gaskets are closed except for a small hole about 1/8. which are the correct gaskets?

 

[Moonunit 451]

OK, I don't remember, but there was some recent discussion on this, within the last two mos. or so. I think in a post of rrubel or Mad-Mic I think. Try PMing Rich. I haven't seen him post recently.

I think the new gasket is fine.

 

[jgmotto]

My '89 has the rear coolant passage blocked. I believe the new ones you got are correct.

 

[rrubel]

Where did you get the gaskets? The original ones on my 86 had the closed passages, but the only ones I could ever find, even listed as being for my car, had the open passages.

Unfortunately, I'm the wrong person to ask about this. I know they changed it at some point, but not when. For 86 with factory manifold, you need the blocked gaskets. That doesn't help you much, I know, but if you can find someone with the '89 shop manual, it should tell you under the installation procedure for the intake manifold (section 6A1, I think).

[RICHR]

 

[ecoman]

thanks for the replies i spoke with a local vette mechanic yesterday he told me to use the restricted gaskets