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Old 05-12-2013, 11:07 AM
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Intake, Head, or Block problem

Hey Guys,
Id appreciate any time in reading this and giving some advice on what could be causing these problems Im having. NOTE: this problem happend and got worse over the course of a few days. I know it is long just trying to give as much info as possible. First off a list of what I have..
327 sbc .060 over maybe 3500 miles.
"Stock style" 4 valve relief pistons
Vortec 906 casting heads cut for 2.02 1.60 , angle milled .125 with the works and quiet a few miles until rebuilt last week.
Mild cam with matched springs
Edlebrock Perf RPM Vortec intake and 1406 Carb.

It was having a random hard start issue. It would be real hard to start. But then once started would run great. No smoke out the pipe, plugs burning CLEAN. Almost too clean for what im used to seeing. But then after shut off for 5 or 10 min it would have a real hard time starting agian. I noticed the major problem when I changed valve springs to match the cam.

During the valve spring change pressurizing the cylinder with air, i could hear air coming from the combustion chamber around the valves, and coming out of the exhaust port. So I knew at this point there was a problem. But it was not currently in my garage and i needed it to run for two more days so i finished the valve spring install. When i got that done I drove it home and to town the next day. I still experienced the hard start and it also started to blow a lil steam or smoke out of the breather but no milky oil. So i took the heads off and they were in bad shape, NOTE: [COLOR=red]they were added to this short block after being run on another motor. [/COLOR]

Took the heads off and had them checked for leaks and rebuilt with a new valve job. With that done and back on the motor with a fresh oil change and all new gaskets, It started right up after some timing adjustment and immediately started puffing that steam out of the breather. This time it was worse. More steam so much that there was ALOT of condensation out of the breather. Oil was very milky kinda like a starbucks drink.lol There is alot more pressure than I think needs to be under the valve cover as I can place my had over the breather hole and feel pressure and hear it when I remove my hand. There is also now water in the oil. Oil was very milky kinda like a starbucks drink.lol And the hard start issue is still there. No smoke anywhere else and the spark plugs still very clean.

I will be doing a compression check this evening to see if there is a problem in the head gasket or piston ring area. Im not so sure it would be the rings. Not very many miles and no smoke out the exhaust, and it dont burn oil. But i have an area of concern around the intake. It being a vortec intake I used the intake gasket style that is plastic with the blue rubber bead around the runners and rtv on the ends. the gaskets lined up great on the intake and heads individually but when put together i have a small amout of the blue rubber bead that goes around the runners sticking up above the intake on both sides.

IS IT POSSIBLE- IF THE COMRESSiON TEST COMES BACK GOOD- that the heads being angle milled as much as they are is causing the bottom of the intake runners and water passages to leak. Since it changes the angle at which the intake meets the heads? Maybe there is an air leak around the runners causing the hardstart/air pressure and the water leaking out underneath the intake into the oil.? Also there was no rtv put on head bolts. I have never done that and never had problem but maybe this is one of them?

ThANK you for taking the time to read and hope someone can chime in with a possible soluition.

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Old 05-12-2013, 02:09 PM
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Dunno if this will be of any help or not, but years ago when I put my Vortec engine together I went through three sets of the stock fel pro intake gaskets before I learned it simply would not seal. I ordered a set of Edelbrock gaskets and that eliminated the problem.
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Old 05-12-2013, 03:04 PM
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Quote:
Originally Posted by DoubleVision View Post
Dunno if this will be of any help or not, but years ago when I put my Vortec engine together I went through three sets of the stock fel pro intake gaskets before I learned it simply would not seal. I ordered a set of Edelbrock gaskets and that eliminated the problem.
^^^^^^^^^this
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Old 05-13-2013, 12:18 PM
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Quote:
Originally Posted by gearheadslife View Post
^^^^^^^^^this
Yes pretty much just that. The problem ended up being the heads are milled so much that when you put the intake on the ports didnt line up properly and was causing water to leak under the intake into the lifter valley. Then it was also causing pressure to be built up under the intake and have a air leak all at once. I bought a fel pro gasket just not the stock plastic one with the small blue bead of rubber around it. This time I tried one that was an all metal gasket...was a lot thicker and had more of a gasket contact patch. Started up and run perfectly. Now just cleaning up a mess.
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