GT40 Head Assembly
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
Thank you for the help. This looks like the one I need: https://www.amazon.com/Competition-C...length+checker
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
I'm going to order new bolts for everything. Looking at the lower intake I see two studs that the coil bracket bolts to. Do these also serve to bolt down the intake, or are they threaded into the intake only? Intake is held down with 10 bolts?
Cargo Master
Joined: Mar 2010
Posts: 3,328
Likes: 292
From: Laramie, WY
The studs that the coil bracket bolts to do in fact also serve as lower intake hold downs.
If you're going with new rod & main bearings bolts make sure the rods are resized and the block line honed. Are you using ARP?
If you're going with new rod & main bearings bolts make sure the rods are resized and the block line honed. Are you using ARP?
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
Only changing out the heads at this time, and yes using ARP bolts for everything. Those studs look skinny and brittle to me, I'm sure they're going to snap. I know the intake bolts have an under head length of 2", so those studs must be around 5" total length because they look to stick up above the intake about 3". Where would a fella find new replacements?
Cargo Master
Joined: Mar 2010
Posts: 3,328
Likes: 292
From: Laramie, WY
The threads are exposed to oil in the lifter galley. I've never had them give me any trouble. The forward most intake bolts are the problematic bolts in my experience, I'm 1 for 3 on snapping those off in the heads.
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Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
Only changing out the heads at this time, and yes using ARP bolts for everything. Those studs look skinny and brittle to me, I'm sure they're going to snap. I know the intake bolts have an under head length of 2", so those studs must be around 5" total length because they look to stick up above the intake about 3". Where would a fella find new replacements?
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
Picking up heads today. Seats ground, new stainless valves, new springs, slightly decked, guides were good. Will be placing an order for the following:
Head gaskets
Upper & lower intake gaskets, valve cover gaskets
Arp head bolts, intake bolts, header bolts and valve cover bolts
Arp thread chaser, moly lube and thread sealant
Crane 1.7 rockers
All I can think of, am I missing anything?
Head gaskets
Upper & lower intake gaskets, valve cover gaskets
Arp head bolts, intake bolts, header bolts and valve cover bolts
Arp thread chaser, moly lube and thread sealant
Crane 1.7 rockers
All I can think of, am I missing anything?
Cargo Master
Joined: Mar 2010
Posts: 3,328
Likes: 292
From: Laramie, WY
Stock rotating assembly right? Which head gasket thickness are you planning on? This will determine squish because the pistons on a stock bottom end should have zero deck clearance. Ideal squish is between 0.035"-0.045". Stock head gasket was 0.039".
Did the shop install new valve seals on your heads?
Did the shop install new valve seals on your heads?
More Turbo
Joined: Jun 1999
Posts: 532
Likes: 1
From: Las Vegas
Picking up heads today. Seats ground, new stainless valves, new springs, slightly decked, guides were good. Will be placing an order for the following:
Head gaskets
Upper & lower intake gaskets, valve cover gaskets
Arp head bolts, intake bolts, header bolts and valve cover bolts
Arp thread chaser, moly lube and thread sealant
Crane 1.7 rockers
All I can think of, am I missing anything?
Head gaskets
Upper & lower intake gaskets, valve cover gaskets
Arp head bolts, intake bolts, header bolts and valve cover bolts
Arp thread chaser, moly lube and thread sealant
Crane 1.7 rockers
All I can think of, am I missing anything?
Thread Starter
|
Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
Stock rotating assembly right? Which head gasket thickness are you planning on? This will determine squish because the pistons on a stock bottom end should have zero deck clearance. Ideal squish is between 0.035"-0.045". Stock head gasket was 0.039".
Did the shop install new valve seals on your heads?
Did the shop install new valve seals on your heads?
Thread Starter
|
Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
Fel-Pro MS 94951 manifold set
On the intake studs, spoke with arp and they didn't have anything, so I'll try and salvage the two stockers
Thread Starter
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Tuned
Joined: Jan 2013
Posts: 305
Likes: 7
From: Middleburg, FL
Looking at this head gasket also https://www.summitracing.com/parts/mrg-5807g/overview/
It's .038 thickness. I've been told the GT40 heads deliver 9.0 compression with stock head gaskets. I'm fine with anything between 9.0 and 9.5 These are double the price of the Felpro's. Not sure how much these would bump compression?
It's .038 thickness. I've been told the GT40 heads deliver 9.0 compression with stock head gaskets. I'm fine with anything between 9.0 and 9.5 These are double the price of the Felpro's. Not sure how much these would bump compression?