pettyboy69

iTrader: (1)

Ok so Ive been reading a bunch on this site and others about the ls7 heads not working on ls1 blocks because of the bore, but my question is related to the valvetrain geometry as well as the push rod, lifter, rocker arm geometry of putting ls7 heads and intake manifold on an ls1 block with sleeves and a 4.155 bore.

What needs to be ran to make this setup work and is it even possible since my bore is in fact big enough now? seems like a great price since used ls7 heads go for under a grand used compared to other aftermarket heads. I've heard about problems with ls3 heads as well with the rockers being offset and that's another reason they won't just bolt on but I'm wondering if I can purchase proper valvetrain and lifters/push rods to make ls7 heads work on an ls1 block.

any help and insite is appreciated.

pettyboy69

iTrader: (1)

I'm really surprised no one has posted any info on this?

96capricemgr

iTrader: (1)

Why put that kind of effort into an LS1 block?

redtan

iTrader: (5)

Because an aluminum block with MID sleeves is significantly stronger and more reliable than any other aluminum block out there and gives you big bores. It's clearly not an LS1 block anymore.

dr_whigham

iTrader: (49)

I asked Steve at RED about doing this to my LS6 block and he wasn't keen on it AT ALL for a street car.

I'd like to know why.

And yes, as long as you have the bore you can run whatever heads you choose, that fit that bore.

pettyboy69

iTrader: (1)

I myself didn't pay for the sleeves I bought the block already done for a heck of a lot cheaper than it would cost to do it so that's why. Now I have much stronger sleeves and I'm not limited on heads or valve size. I personally wouldn't spend the money to have it done but I got a good enough price that it didn't make sense to buy an lsa or lsx block over this one.

I've also ran plenty of MID sleeved motors on the street with 0 issues so I wasn't afraid of this one

redtan

iTrader: (5)

Never heard of an issue with running these on the street, unless it was a wet sleeved block and it somehow impeded the cooling ability of the system and was not reliable day to day.

dr_whigham

iTrader: (49)

Ooooo... not afraid to admit when I'm mistaken and THAT is a high possibility.

A.R. Shale Targa

iTrader: (2)

Thought I read somewhere that the LS 6 block is less desirable to sleeve than an LS 1,2, or 3 due to the lower end webbing having less strength. Larger ventilation (bay to bay) breathing for the higher strung ZO6. Remember most of GMs early testing was done with iron blocks as they were constantly exploding the aluminum ones due to the excessive inter bay pressure which was solved by the bulkhead vent holes.

pettyboy69

iTrader: (1)

ok well I guess Ill start tracking down a set of ls7 heads for the new setup since nothing else comes close in flow for the price. It will be nice too because I can use a stock ls7 intake manifold

The main thing I was worried about is the rocker arm/lifter pushrod geometry

Kevin Doe

iTrader: (1)

pettyboy69, any update on this effort, 4 years later?

NHRATA01

iTrader: (10)

From memory of reading his older posts, I believe that (the LS6 bay windows) was why he didn't like to MID LS6 blocks but I thought he was content with LS1 blocks.


Whoops, just realized it was a 4 year old thread. But yeah I'd be interested to see how OP's build is holding up.