copo at the classic

BlueOval Ralph · 10-15-2012, 04:36 PM

Head is bending under pressure real common Deck is not thick enought as I remember it is only .400 + or -

Quote:

Originally Posted by Ed Wright

Probably. I have seen a lot of that with LS engines and a lot of boost. Not enough head bolts, imho.

D.Johns · 10-15-2012, 05:05 PM

I thought the issue lied with the chamber design not being as FI friendly causing pre-ignition taking out the head gaskets. I don't have much experience with FI LSs through because they ran so well NA on and off nitrous and had no room to stuff a blower/turbo under the hood of the GM cars.

Is there head warpage issues? The early B-head 4 valve modulars had that issue with some mileage on them. Both the cars use MLS gaskets so that would make sense.

boster · 10-15-2012, 05:07 PM

D John , you got it correct

BlueOval Ralph · 10-15-2012, 05:11 PM

The chamber design leaves a lot to be desired, but the casting bending under cylinder pressure is a major issues. I know this is different but the Dura Max has same problem when the cals are changed.

Ed Wright · 10-15-2012, 05:33 PM

Quote:

Originally Posted by BlueOval Ralph

Head is bending under pressure real common Deck is not thick enought as I remember it is only .400 + or -

Pretty much what we found. One customer (not real sharp) had his block & heafs machined for 5/8" studs. He had a turbo with a lot of boost. All he accomplished was more block and head deck distortion when he torqued them. Actually pushed gaskets out sooner. Tried to tell him, but he was still in his 20s. I remember being in my 20s. Life was simpler when I has all the answers. LOL

10-15-2012, 05:05 PM	#2
D.Johns Member Join Date: Dec 2011 Location: Indiana Posts: 437 Likes: 15 Liked 18 Times in 6 Posts	Re: copo at the classic I thought the issue lied with the chamber design not being as FI friendly causing pre-ignition taking out the head gaskets. I don't have much experience with FI LSs through because they ran so well NA on and off nitrous and had no room to stuff a blower/turbo under the hood of the GM cars. Is there head warpage issues? The early B-head 4 valve modulars had that issue with some mileage on them. Both the cars use MLS gaskets so that would make sense. __________________ 2014 Cobra Jet FS/XX #3345 STK/SS Like us on http://www.facebook.com/pages/Daniel...25886327426822

10-15-2012, 05:07 PM	#3
boster Senior Member Join Date: Oct 2003 Location: usa Posts: 958 Likes: 0 Liked 0 Times in 0 Posts	Re: copo at the classic D John , you got it correct __________________ Bo Kenney

10-15-2012, 05:11 PM	#4
BlueOval Ralph Banned Join Date: Feb 2008 Posts: 852 Likes: 0 Liked 0 Times in 0 Posts	Re: copo at the classic The chamber design leaves a lot to be desired, but the casting bending under cylinder pressure is a major issues. I know this is different but the Dura Max has same problem when the cals are changed.