Need SBC(350) help quick! My DD is down...

[LongIslander26]

Intakes

I did the plugs first, ran better but still smoked, THEN the intakes, much better after that. Also you want to be sure the gaskets you used are made for aluminum intakes on iron heads. Alot of parts guys will just give you the ones made for the stock iron intakes, and they are too thin. The ones for the Aluminum intakes are thicker, because aluminum expands and contracts more, and you can't tighten them down as hard as an iron intake either. Alot of times what will happen is the gasket will leak from the BOTTOM, and suck oil out of the lifter valley, even though everything appears hunky-dory up top. This is also why you need the thicker gasket with an aluminum intake. Maybe put the Performer RPM it had on it back on, since you said it ran fine with it before.

 

[LongIslander26]

Blue smoke

Let us know what you end up finding!

 

[crawlink5]

I expected to hear from him yesterday - he may havae ended up burning it.

 

[LongIslander26]

 

[R72K5]

just wanted to toss in this tidbit:

the 80-up 4bbl 305s(LG4, L69, LU5 etc) and alot of the 70s 2bbl 305s were factory aluminum intake and they always run iron gaskets and no problems

good luck

 

[BowtieBlazer]

Sorry about the long wait I was able to swing a family vehicle out of the loop, and have been very busy with school and work. Pulled the intake just a minute ago and it appears to be a leak in the intake gasket on the back two passenger side runners coated with oil. Hopefully get it reassembled this evening and we'll see if that fixes it!

Thanks for all the postings and help....we'll see what happens next

 

[fatbob]

Dont you love those cheap easy fixes? I mean a gasket is a lot cheaper than new rings.

 

[bablazer73]

Compression test I.M.O are useless for really finding engine problems. Unless you have a dead hole. the best way to check the cyliders is to use a leakdown tester. This will show the % of ring blowby and can also help find sources of cylider pressure losses. You can buy 2 guage units for under 100.00 and well worth the money. a cheap way to check for blowby is to put a air pressure guage in the pcv port on the valve cover and plug the breather side and start the engine up. Usually anything above 3-4 psi in the crank case is bad news.The fact that all the cylinders are burning oil would make me believe in a common source. was that a new intake you put on? is it possable that it's cracked under the carb area and sucking in from the lifter valley??