Lq4 build
TECH Regular
Joined: Dec 2020
Posts: 423
Likes: 132
From: Ohio
Most pushrods will work, but it'd be best to measure once the longblock is together.
My engine builder recommends .080" wall push rods. The stock ones will start to deflect a bit with heavier springs and cause valvetrain instability.
And if you're using non adjustable rockers you'd have to figure out what preload you'd like to run on them. The hydraulic lifters compress a little when the oils get more aeration in upper rpm's. The less preload the less they compress. But I'd go with whatever the service manual says for your lifters, and measure the pushrods at the end.
Contrary to a lot of advice given out over the internet I don't believe the engine will immediately explode if you don't do this.
My engine builder recommends .080" wall push rods. The stock ones will start to deflect a bit with heavier springs and cause valvetrain instability.
And if you're using non adjustable rockers you'd have to figure out what preload you'd like to run on them. The hydraulic lifters compress a little when the oils get more aeration in upper rpm's. The less preload the less they compress. But I'd go with whatever the service manual says for your lifters, and measure the pushrods at the end.
Contrary to a lot of advice given out over the internet I don't believe the engine will immediately explode if you don't do this.
Thread Starter
Teching In
Joined: Dec 2020
Posts: 14
Likes: 4
From: Ontario canada
Most pushrods will work, but it'd be best to measure once the longblock is together.
My engine builder recommends .080" wall push rods. The stock ones will start to deflect a bit with heavier springs and cause valvetrain instability.
And if you're using non adjustable rockers you'd have to figure out what preload you'd like to run on them. The hydraulic lifters compress a little when the oils get more aeration in upper rpm's. The less preload the less they compress. But I'd go with whatever the service manual says for your lifters, and measure the pushrods at the end.
Contrary to a lot of advice given out over the internet I don't believe the engine will immediately explode if you don't do this.
My engine builder recommends .080" wall push rods. The stock ones will start to deflect a bit with heavier springs and cause valvetrain instability.
And if you're using non adjustable rockers you'd have to figure out what preload you'd like to run on them. The hydraulic lifters compress a little when the oils get more aeration in upper rpm's. The less preload the less they compress. But I'd go with whatever the service manual says for your lifters, and measure the pushrods at the end.
Contrary to a lot of advice given out over the internet I don't believe the engine will immediately explode if you don't do this.
Thread Starter
Teching In
Joined: Dec 2020
Posts: 14
Likes: 4
From: Ontario canada
Q- Which head gasket should I run? A- How much compression do you want?
Q- Which trunnion kit do you recommend? A- CHE
Q- Will the push rods from a 5.3 (where the heads came from) work? A- All stock 5.3 and LQ4 pushrods are the same
Q- Which stall converter to run? A- Where is your power band?
Q- Which trunnion kit do you recommend? A- CHE
Q- Will the push rods from a 5.3 (where the heads came from) work? A- All stock 5.3 and LQ4 pushrods are the same
Q- Which stall converter to run? A- Where is your power band?
in terms of power band, I mean it will be all over, it’s mostly a street car, but I have a heavy foot lol, to be honest be able to roast tires from a stop but be able to drop a gear an go on the highway
Thread Starter
Teching In
Joined: Dec 2020
Posts: 14
Likes: 4
From: Ontario canada
also, the heads are from an ls6 am I right with saying that this is a 5.7 liter? And for gaskets I would need to use a vette from 2001 to 2005 (or CTS -v)
Thread Starter
Teching In
Joined: Dec 2020
Posts: 14
Likes: 4
From: Ontario canada
Hey everyone, so after talking with my machine shop, I made a quote through BTR, ls1/ls2 n/a stage 3 33144133R0 part number, ls dual valve springs, platinum retainers .660 lift, chromolly push rods 7.400 length 5/16 wall 0.80 diameter.
My machine shop is going to get me the lifter set unless I get a set from BTR.
does this sound about right to you guys?
thanks in advance, Chris
My machine shop is going to get me the lifter set unless I get a set from BTR.
does this sound about right to you guys?
thanks in advance, Chris
That’s a large cam and will be perfect in my opinion for what it’s going in. And like mentioned above a 3.73 gear and a 3600-4000 stall will very important with making a cam like that work well.
You will like it.
You will like it.
TECH Fanatic
Joined: Jan 2017
Posts: 1,758
Likes: 442
Will be a bit wild. You will want at least a 3.73 gear. Minimum 3600 stall. I recommend circle D. Compression is a bit low I'd have run it at least 11:1 but it wont make a huge difference. I would also definitely send the heads to tsp and get a full job done on them.
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Verdad Gallardo Thread Starter
Teching In
Joined: Dec 2020
Posts: 14
Likes: 4
From: Ontario canada
I would love to be able to send the heads to TSP but that’s a huge shipping cost for me lol, iam in Ontario Canada, so my local shop is probably going to handle having a look at the heads for me