Davidgmcman

I just finished building a lm7 bored over to ls1 with brand new PRC CNC ls6 heads I used factory mls head gaskets engine starts runs fine yesterday after fixing a small oil leak caused by a sensor I noticed coolant dripping on the floor from the far back passenger side headbolt these are brand new gm factory headbolts and reused and I did not put sealer on them cause I've never done that on LS engines before I don't think that coolant is going in the engine but I'm going to check today the block is 99lm7 block any suggestions?

Davidgmcman

*not reused brand new headbolts

gagliano7

We had that problem on a SBC ended up being a hairline crack in the head. Hopefully yours is something simple.

Davidgmcman

Thanks yea I inspected them good and Texas speed did also I'm going to remove them and put thread sealer on them and hopefully that fixes it

01ssreda4

iTrader: (96)

If your sure it wasn't from the coolant crossover pipe then it seems like you are redoing a head gasket.

slogo

do the head bolt holes go into the coolant system? i did not think they were drilled
all the way through.

LS1MCSS

iTrader: (18)

Head bolt holes are blind drilled. They don't go to the water jacket unless you have a crack somewhere.

codyseals

Any updates

Davidgmcman

Pulled heads inspected heads put new head gaskets new bolts even new dowel pins and thread sealer on bolts and retorqued engine runs great I figured what's in the hole will come out overtime and will seal its self I'll check it agian today

Davidgmcman

I thought maybe the gasket was out of line somehow the first time but I was extremely thero I know the bolts don't go into water jackets I put sealer on them just out of habit I'll see what she's doin today

LS1-450

iTrader: (33)

If fluid was left in the holes when the heads were pulled, it is trapped & can expand & crack the block.

Davidgmcman

Found the issue yesterday kinda dumb move on me the heads both have a hole for a ect sensor I had a older broken sensor thati used to plug the one hole and I guess I forgot to put a wrench on it all the way it was directly above the headbolt so it slowly leak around and dripped of the bottom typical but I'm glad it won't nothing big

01ssreda4

iTrader: (96)

Glad you found the issue.