a.white86

iTrader: (5)

Some know I posted info about my front mount turbo setup i'm planning.

My question is, I read about 6 bolt only for big boosted applications. I was planning to use my LS1 aluminum block for a front mount, 76/91 setup, would be happy anywhere between 800-1000hp. But, my LS1 is a 4 bolt right? What blocks are 6 bolt setups? And do different heads go with different bolt patterns?

DEFYANT

Any factory LSx block utilizes a 4-Bolt per cylinder setup. The Chevrolet Performance LSX, the ERL Performance SuperDeck I & II, the World Products Warhawk, the Dart LS-Next, the Dart Billet, the RHS, and the LSM Billet are all 6-bolt setups. You can use 4-Bolt heads on 6-Bolt blocks, and vise versa.

a.white86

iTrader: (5)

ahhhh ok that explains a lot to me. So my block can utilize "6 bolt heads" then.

I ask because I hear of boosted LS's lifting the heads up off the motor regularly, and using a 6 bolt head should be manditory.

What heads can I use, that are 6 bolt? 317?

Jenson

iTrader: (32)

6 bolt heads will fit a stock block, but you'll still only have 4 used. Must send it to ERL to be modified. There are no 6 bolt factory heads either.

DEFYANT

Yes you can utilize 6-bolt heads, and no, there are no 6-bolt 317 heads. AFR, TFS, Mast, AllPro, all aftermarket manufacturers have a 6-bolt options. A 4-bolt setup can live to 1200hp if tuned properly.

jasond26

iTrader: (22)

Well Gm offers the LSX series heads that are 6 bolt (LS3,LSA,LS7). They use factory components they are just 6 bolt. Really the only reason to get 6 bolt now is if you plan on upgrading the block in the future. I guess if your buying new then getting them now would not hurt.

LS1x2

iTrader: (11)

I've found 6 bolt heads to not be needed at my power level of 950rwhp. I've done some long pulls with it too. You want a head with a thick deck and no thin spots. Cheapest option I believe is 317's. I went with AFR 225's. You've gotta be conservative with the tune. What you get away with on the dyno isn't real world.

symerton

Yes the 6 bolt heads will work on your 4 bolt block.
But you still only have 4 bolt clamping force with 6 bolt heads on your 4 bolt block.

a.white86

iTrader: (5)

Thank all of y'all for the info. I appreciate it, and you'll probably see me posting with more questions periodically.

Thanks again.