blown head gasket (third time)
#1
blown head gasket (third time)
Hello!
Nice forum, im from chile!
Well, i have a Lo5 engine 2 bolts, speed pro l2256f .40 bore (9,8 to 1 i think), mild edelbrock cam, intake summit, carb edel 1406 custom headers, fully balanced (153 tooth flywheel) stock cams (now im gonna port it just a little).
It really works fine when it works (not super powerfull, but it revs fast, very fast up to 5500)
My problem is that i have blown head gasket 3 times (1500KM)... (im a little tired from changing the heavy heads )
I use victor reinz 1178vc (there are not more alternatives in my country, but i can get another from summit).
Well i think the assembly was right, cleaned the holes, heads shaved, new standart chevy bolts, head bolts to 25-45-65 Helical Sequence (info from http://www.torkspec.com/torkspecme.a...-5.7L-350ci-V8).
The gaskets blows when i push the pedal up to the radiator (heavy load too many times).
Any clues?
Maybe the gaskets are not the best for my app?
las time after the blows, i checked the torque and it was fine (before i removed the heads).
Im very lost!!
thanks
Chris
Nice forum, im from chile!
Well, i have a Lo5 engine 2 bolts, speed pro l2256f .40 bore (9,8 to 1 i think), mild edelbrock cam, intake summit, carb edel 1406 custom headers, fully balanced (153 tooth flywheel) stock cams (now im gonna port it just a little).
It really works fine when it works (not super powerfull, but it revs fast, very fast up to 5500)
My problem is that i have blown head gasket 3 times (1500KM)... (im a little tired from changing the heavy heads )
I use victor reinz 1178vc (there are not more alternatives in my country, but i can get another from summit).
Well i think the assembly was right, cleaned the holes, heads shaved, new standart chevy bolts, head bolts to 25-45-65 Helical Sequence (info from http://www.torkspec.com/torkspecme.a...-5.7L-350ci-V8).
The gaskets blows when i push the pedal up to the radiator (heavy load too many times).
Any clues?
Maybe the gaskets are not the best for my app?
las time after the blows, i checked the torque and it was fine (before i removed the heads).
Im very lost!!
thanks
Chris
#2
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Car: 67 ******mobile
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Re: blown head gasket (third time)
Im assuming these are iron heads?
When you had them off did you have a machine shop magnaflux them to check for cracks? They cant always be seen with the naked eye
When you had them off did you have a machine shop magnaflux them to check for cracks? They cant always be seen with the naked eye
#3
Re: blown head gasket (third time)
hello!
Yes, iron heads, not magnaflux, but one time was the right head and then the left head, so i believe that is not a crack. one head cracked...can be...but both? I dont believe i have so bad luck...
The only machinist that i know that magnafluxes its very very expensive. (%#" too much!)
Its easier to get some other heads... i fact im trying to get some vortecs! (the search continues)
thanks
C
Yes, iron heads, not magnaflux, but one time was the right head and then the left head, so i believe that is not a crack. one head cracked...can be...but both? I dont believe i have so bad luck...
The only machinist that i know that magnafluxes its very very expensive. (%#" too much!)
Its easier to get some other heads... i fact im trying to get some vortecs! (the search continues)
thanks
C
Last edited by cvdfj; 07-10-2012 at 12:05 PM. Reason: add info
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Car: 1989-92 FORMULA350 305 92 Hawkclone
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Re: blown head gasket (third time)
Could be lots of things. Low fuel PSI or to much timing. Cracked/warped, head/block...
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Car: 1987 GTA.
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Re: blown head gasket (third time)
i would bring the heads to a machine shop and make sure they are not warped or cracked. also, don't reuse the old head bolts, they tend to stretch after going in and out a few times. and for added security, go with head stud's, they tend to be stronger.
that said checking everything else wouldn't hurt.
that said checking everything else wouldn't hurt.
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