few technical questions
Thread Starter
Registered User
Joined: Jan 2015
Posts: 4
Likes: 0
few technical questions building motor for my swap into my Porsche 944. I have a lq4 block, just picked up some 806 heads. my question is what headgasket do I use? someone said something about some gaskets will cause coolant to leak. also what push rods shall I use? the stock lq4 ones? also im using ls4 intake off 5.3 car motor. thanks for all the help in advance.
Welcome to LS1tech!
Stock GM or aftermarket MLS gaskets will do fine. Match them to the bore size and get the head bolts installed correctly.
You MUST use new bolts (if staying with GM bolts). I always recommend ARP head studs or at least ARP head bolts.
Sounds like an interesting swap, you should start a build thread in our conversions section: https://ls1tech.com/forums/conversions-hybrids-28/
Stock GM or aftermarket MLS gaskets will do fine. Match them to the bore size and get the head bolts installed correctly.
You MUST use new bolts (if staying with GM bolts). I always recommend ARP head studs or at least ARP head bolts.
Sounds like an interesting swap, you should start a build thread in our conversions section: https://ls1tech.com/forums/conversions-hybrids-28/
806 heads had a notch in the deck. The original GM gaskets were a composite material (I believe it was graphite impregnated) not like the newer MLS gaskets. GM part number was #12498543
I believe Felpro has a gasket that will work for either type of head. Notched or un notched. I have no info on that though...
I believe Felpro has a gasket that will work for either type of head. Notched or un notched. I have no info on that though...
The 806 castings will require the older graphite head gaskets, as mentioned. However, the part number listed is for an LS1, so they won't work. Those gaskets have a 3.91" bore size. You would need the set that is 6.0L specific.
As for the pushrods, are you going to run a stock cam or aftermarket? If you're going to run aftermarket, you'll need a set of hardened pushrods for the more aggressive lobes. Which set will also depend on which cam. Some of the more aggressive cams will use a smaller base circle cam core, which will require a slightly longer pushrod. We always recommend checking for proper pushrod length via an adjustable pushrod length checker. The one we sell is listed below:
http://www.texas-speed.com/p-275-com...h-checker.aspx
Give us a call if we can help you with cam and valvetrain selection. We offer multiple packages that will include your choice of cam, a set of valve springs, and a set of hardened pushrods starting at $629.99!
http://www.texas-speed.com/c-845-camshaft-packages.aspx
Which package you choose will be dependent on which cam you choose. The cheaper package will include a set of PRC 1518 single beehive valve springs that will support up to .625" lift, and the more expensive package will include the PRC .650" dual valve spring kit that includes springs, titanium retainers, new seats, and new valve seals. Let us know if we can help!
As for the pushrods, are you going to run a stock cam or aftermarket? If you're going to run aftermarket, you'll need a set of hardened pushrods for the more aggressive lobes. Which set will also depend on which cam. Some of the more aggressive cams will use a smaller base circle cam core, which will require a slightly longer pushrod. We always recommend checking for proper pushrod length via an adjustable pushrod length checker. The one we sell is listed below:
http://www.texas-speed.com/p-275-com...h-checker.aspx
Give us a call if we can help you with cam and valvetrain selection. We offer multiple packages that will include your choice of cam, a set of valve springs, and a set of hardened pushrods starting at $629.99!
http://www.texas-speed.com/c-845-camshaft-packages.aspx
Which package you choose will be dependent on which cam you choose. The cheaper package will include a set of PRC 1518 single beehive valve springs that will support up to .625" lift, and the more expensive package will include the PRC .650" dual valve spring kit that includes springs, titanium retainers, new seats, and new valve seals. Let us know if we can help!
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
