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  #16 (permalink)  
Old 06-05-2014, 09:28 PM
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Thanks Joker, what do i need to swap the beehives on the L31 Heads?

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Old 06-06-2014, 08:41 AM
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If you use the stock L31 heads these springs work good.

http://www.alexsparts.com/valve-spri...rf-hyd-roller/
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Old 06-06-2014, 08:51 AM
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Thanks bob, saw them yesterday, do i have to do measurings?
What cam are you using?
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Old 06-06-2014, 11:27 AM
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All springs should be shimmed to the correct installed height and clearances always need to be checked. My cam has .497 lift and .530 if I use 1.6 rockers

Comp 08-412-8
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Old 10-08-2014, 05:18 PM
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Today we have received the VMax spacer , beautiful thing !
We are planning on install it, but we have a doubt.

When the head swap day comes, we will have to dissasemble the intake?
i mean separate the vmax spacer from the lower intake?
As far as we know this vortec intakes are different than classic SBC Intakes since
they have a plastic top or cover, when we swap heads we are going to be able to remove
the full intake as a unit or we will have to take the spacer off and then assemble the whole thing again?

Thank you
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  #21 (permalink)  
Old 10-08-2014, 05:27 PM
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You should be able to remove upper & lower intake w/o seperating.
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Old 10-08-2014, 05:29 PM
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Thanks i have never removed/replaced a Vortec intake
so when you remove this intakes is not mandatory to separate them right
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  #23 (permalink)  
Old 10-08-2014, 05:37 PM
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That is correct.
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Old 10-08-2014, 05:40 PM
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Thank you, we will add this as well
Taylor Helix Power Tower Plus Throttle Body Spacers
http://www.summitracing.com/int/parts/tay-57015/

Not sure if it will work as good as advertised but we will give it a chance
since i've read good reviews of those.
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  #25 (permalink)  
Old 10-08-2014, 05:52 PM
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First off, buy headers with a minimum of 3/8" thick flanges to minimize distortion from heat and spittin' out the gaskets. Buy headers with long-tube tuned runners, all the runners the same length. You buy headers to increase power so don't cheeze out on the specifications to save a little money. You'll regret it later.

Secondly, curb weight of the Yukon is 5,150 lbs (2,336 kilos). Add a couple of guys and you are well over 5,500 lbs. Whatever pissy little changes you make to the motor will only serve to lighten your wallet. That rig will never be fast.

If I wanted it to sound better down at the Sonic Drive-In, I might screw a standard Thumpr cam into the block. It'll work with the stock static compression ratio and should sound pretty good. It'll also work in the rpm range that the L31 heads will support....
http://www.compcams.com/Company/CC/c...?csid=216&sb=0
Intake valve closes at 35.5 degrees ABDC, so stock 9.4:1 static compression ratio would produce a dynamic compression ratio of 8.26:1, perfect for iron heads and pump gas.

Strongly advise against anything but 1.5 rocker arms with the L31 heads. They won't flow much over 0.500" valve lift anyway and you're already there with the Thumpr cam and 1.5 rockers.

.

Last edited by techinspector1; 10-08-2014 at 06:06 PM.
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  #26 (permalink)  
Old 10-08-2014, 05:52 PM
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IDK if they help or not.Thinning the throttle blade & porting/smoothing the TB seems to help more than anything to me.I know 2 ppl who have used the Vmax. 2 ppl...same spacer.1 guy pd $300 for it.Didn't like it.Said he saw no gain @ all,so,he sold it to another who installed & said the same thing.Ppl complain about the Vortec intake & for high HP use,it is restrictive,but,it will flow plenty of air to support the amount of fuel the stock injectors will supply.You will run out of fuel way before you run out of air.After approx 350 HP,you run into lean conditions @ WOT.
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Old 10-08-2014, 06:00 PM
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Quote:
Originally Posted by techinspector1 View Post
First off, buy headers with a minimum of 3/8" thick flanges to minimize distortion from heat and spittin' out the gaskets.

Secondly, curb weight of the Yukon is 5,150 lbs (2,336 kilos). Add a couple of guys and you are well over 5,500 lbs. Whatever pissy little changes you make to the motor will only serve to lighten your wallet. That rig will never be fast.

If I wanted it to sound better down at the Sonic Drive-In, I might screw a standard Thumpr cam into the bearings. It'll work with the stock static compression ratio and should sound pretty good. It'll also work in the rpm range that the L31 heads will support....
08-600-8 - Thumprâ„¢

Strongly advise against anything but 1.5 rocker arms with the L31 heads.

Thank you, we already have headers with 5/16 in. flange
We got this : http://www.summitracing.com/int/parts/pte-h8059/
Maybe down the road we will get some Hookers or Hedmans if needed.

Crane Rocker arms have been purchased as well
http://www.summitracing.com/int/parts/crn-10759-16

Hotcam is here as well
http://www.summitracing.com/int/parts/nal-24502586

Yes i know is a heavy truck, but we are looking to make it
more fun to drive, pretty much the same upgrades i did to my 87 vette
which runs pretty good now.
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Old 10-08-2014, 06:01 PM
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Quote:
Originally Posted by jokerZ71 View Post
IDK if they help or not.Thinning the throttle blade & porting/smoothing the TB seems to help more than anything to me.I know 2 ppl who have used the Vmax. 2 ppl...same spacer.1 guy pd $300 for it.Didn't like it.Said he saw no gain @ all,so,he sold it to another who installed & said the same thing.Ppl complain about the Vortec intake & for high HP use,it is restrictive,but,it will flow plenty of air to support the amount of fuel the stock injectors will supply.You will run out of fuel way before you run out of air.After approx 350 HP,you run into lean conditions @ WOT.
Thanks, maybe upgrading the spider in the future.
Won't be flooring it much either so hopefully it will be fine
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  #29 (permalink)  
Old 10-08-2014, 06:28 PM
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Quote:
Originally Posted by Calderone View Post
Crane Rocker arms have been purchased as well
http://www.summitracing.com/int/parts/crn-10759-16
You'll have to do some surgery on the heads to install screw-in rocker studs and guide plates. The stock L31 rockers were located on the valve stem tip with rail rockers. These rockers are not rail rockers, although most companies who make roller rockers also make roller rail rockers. The 1.6 ratio will only add stress to the valvetrain. You will see no performance improvement from them. I have seen combos such as this LOSE power with 1.6 rockers.

.
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  #30 (permalink)  
Old 10-08-2014, 07:00 PM
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Quote:
Originally Posted by techinspector1 View Post
You'll have to do some surgery on the heads to install screw-in rocker studs and guide plates. The stock L31 rockers were located on the valve stem tip with rail rockers. These rockers are not rail rockers, although most companies who make roller rockers also make roller rail rockers. The 1.6 ratio will only add stress to the valvetrain. You will see no performance improvement from them. I have seen combos such as this LOSE power with 1.6 rockers.

.
Dear Techinspector, we are not using the stock heads
we are getting AFR 0912 heads. with the Hotcam, which uses 1.6
Air Flow Research
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