LS7 head on LS2
I may or may not be doing some mock-up work with GM ls7 heads currently in the shop on a ls2 block 4” bore with some tricks. I’ll post up when I’m certain it will work. Can’t tell too much right now. Been messing around with this for a while off and on.
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Thanks!! That gave me a bunch to keep watching. Looks like Hooper Heads and CID are in the process also. I hope Che70velle will keep us posted on his version. I really don't want to pay for a Billet piece---probably way out of my price range.
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For the price difference and availability, looks like the LS3 heads would be more in my price range. I had heard that there was some hp to be gained in using LS7 style heads over the LS3. By the way---what is the fragility issue of the LS& heads?
Here is another "what if", what if I sleeved my LS2 block for 427 bore size---what head would you use?
Thanks
Here is another "what if", what if I sleeved my LS2 block for 427 bore size---what head would you use?
Thanks
Joined: May 2004
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From: Halfway back on the Highway to Hell...again!
Still better off using a good LS3 style head. The advantage of an LS7 head is the 6 bolt design. Your LS2 block still doesn't support it. So you're not gaining anything.
It leaves a nasty shoulder up on the top of the cylinder on each side of the chamber. This is why I want to run this combo before I say it works. Yes the head will fit, but will it work and what will this do with performance? Intake valve shrouding is negligible as the LS7 intake is purposely moved out toward the center for flow. Exhaust valve shrouding shouldn’t be an issue since piston is doing the work and would push the spent gasses through any window provided. Again…I need to run this on a dyno and do some testing before you’ll hear me say it’s a go.
At the end of the day, because of chamber sizing, I’d bet $10 that the LS3 head outperforms the LS7 head on a 4” bore, without any chamber work being done to the LS7 casting. More to come…
Only the LSX and aftermarket offers 6 bolt design cylinder heads and only LSX or aftermarket blocks can take full advantage of 6 bolt cylinder heads.
Launch is running a set of GM #17802752 heads. GM built these for a Daytona Prototype racing program. Quite a few of these pop up for sale on FleaBay and there’s another set currently for sale there by a business that ive bought a lot of stuff from. I can’t post a link. PM me if you want the link. Designed for small bore, high rpm race apps, about the only thing these heads have in common with an LS7 casting is the intake manifold mounting flange. Not a bad deal for the money. They come fitted with Ti intakes and exhaust valves, currently selling for $2k. I think Launch paid $1500 if I’m not mistaken? I’ve had some parts of these DP engines come through my shop, most of it hurt pretty bad.
