Turn-key L35 head package

WyoSyclone

WyoSyclone

Active member
Re: Turn-key L35 head package

Just want to put out a big thumbs up to Phil (WildPhil) for going to a Pick a Part and pulling a set of L35s for me! He was nice enough to get them boxed up and shipped out to me.
Finally, I'll have a set of L35s to build and then put on the wet flow bench to see how much we can squeeze out of these things!

Thanks Phil! :D
 
wildphil

wildphil

I Love My Ty's
Re: Turn-key L35 head package

I was happy to get them for you Rob. You are always helping me. And you do a lot for the SyTy community.
 
neildemo

neildemo

Administrator
Re: Turn-key L35 head package

I am folllowing your thread I am intrested in a few sets as well. Good Luck.
 
WyoSyclone

WyoSyclone

Active member
Re: Turn-key L35 head package

Update...
Heads that Phil pulled for me are going to my machinist tonight. We're in conversations right now putting together a build list for them.

After they're assembled I'll be taking them up to Creek Flow Management in Billings to put on their wet flow bench to see if we can pull some additional performance out of them. Main thing we'll be looking for is standing wave resonances taking place within the intake ports. Sometimes, making just a slight change can get rid of those and up the performance greatly.

I'll keep you updated and hopefully soon have some good pics to post. :D
 
turbodig

turbodig

Active member
Re: Turn-key L35 head package

WyoSyclone said:
Update...
Heads that Phil pulled for me are going to my machinist tonight. We're in conversations right now putting together a build list for them.

After they're assembled I'll be taking them up to Creek Flow Management in Billings to put on their wet flow bench to see if we can pull some additional performance out of them. Main thing we'll be looking for is standing wave resonances taking place within the intake ports. Sometimes, making just a slight change can get rid of those and up the performance greatly.

I'll keep you updated and hopefully soon have some good pics to post. :D
Click to expand...

Rob,

Do you have an intake to test with the head? I'd be really curious to see the wet-flow dynamics with the manifold in place.

It'll be interesting to see what effects the L35 "ramp" has on wet flow. My suspicion is that it causes too much mixture motion, and causes the fuel to separate to the outside. (sorta like an old cream separator)
 
WyoSyclone

WyoSyclone

Active member
Re: Turn-key L35 head package

turbodig said:
Rob,

Do you have an intake to test with the head? I'd be really curious to see the wet-flow dynamics with the manifold in place.

It'll be interesting to see what effects the L35 "ramp" has on wet flow. My suspicion is that it causes too much mixture motion, and causes the fuel to separate to the outside. (sorta like an old cream separator)
Click to expand...

Hi Dig,
I've got the upper/lower manifolds as well as a set of exhaust manifolds. I'll be taking the whole package up there and hopefully spending a full day working on it. I'll also be taking my 60lb Siemens and the fuel rail up so we can see how they affect flow once inserted into the path. Should be a fun, informative day!
 
GAShan

GAShan

Donating Member
Re: Turn-key L35 head package

I have a set of L35's sitting that were ported by Wilson Manifolds. Curious to see what numbers you get. We were more concerned with port velocity and keeping the fuel in suspension than just peak flow numbers.
 
It's just a six

It's just a six

Super Member
Re: Turn-key L35 head package

GAShan
The heads you got ported are for a turbo charged engine?
If so,port velocity should not be of concern & being those are production Chevy heads (small intake port volume), the port velocity is going to be high regardless how much you can port them & open up the port windows.:2cents:

How much did your heads flow after Wilson ported them?
 
GAShan

GAShan

Donating Member
Re: Turn-key L35 head package

Heads are for a mild build with my Syclone. TE-51, port matched upper and lower intakes, 50 lb injectors with an Ultimate 3 bar, 412 cam, Crane 1.6 rollers, stock bottom end, 2800 9/11 stall. They felt that port velocities were important for off boost throttle response and keeping the mix in suspension. What flow numbers would you like to see? I can do the whole chart but at .500 they did 217.3 intake and 180.6 exhaust at 28".
 
It's just a six

It's just a six

Super Member
Re: Turn-key L35 head package

It would be good to post the whole chart.

IMO , the port velocity in your turbocharged engine is a non issue, if you would want better off boost throttle response just increase the compression a bit, that will help a lot or use a smaller A/R on your turbine housing.
What is the A/R on your turbine housing?
Stock/ported heads L35's 96 & newer Vortec etc, pretty much dont flow more CFM after .500" lift.
Post your head flow chart.
217 cfm is pretty good considering it sounds like they did not open up the size of your port windows much. It most likely has a nice valve job w/proper throat angles,valve seat angles & widths, all are very important to get a cyl head to flow good.

If any of the angles,throats improperly cut, seats too wide, it will absolutely kill the airflow.
Here is Tookys Vortecs
Intake Exhaust

Lift Stock Ported Diff (CFM) Lift Stock Ported Diff (CFM)
----------------------------------------------------------------------------------
0.050 31.3 30.6 -0.70 0.050 24.7 24.7 +0.00
0.100 62.6 61.2 -1.40 0.100 49.3 49.3 +0.00
0.150 97.0 94.9 -2.10 0.150 77.5 75.4 -2.10
0.200 131.3 128.5 -2.80 0.200 105.7 101.5 -4.20
0.250 159 154.4 -4.60 0.250 122.2 120.9 -1.30
0.300 186.6 180.3 -6.30 0.300 138.7 140.3 +1.60
0.350 202.5 197.7 -4.80 0.350 147.1 148.2 +1.10
0.400 218.5 215.2 -3.30 0.400 155.5 156.0 +0.50
0.450 227.3 224.5 -2.80 0.450 159.3 162.7 +3.40
0.500 216 227.4 +11.40 0.500 162.6 168.7 +6.10
0.550 219 219.7 +0.70 0.550 163.9 171.5 +7.60
0.600 217.2 220.8 +3.60 0.600 165.2
0.650 218.5 0.650

Avg: 184.8 188.5 +3.70 Avg: 137.5 135.7 -1.80
 
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It's just a six

It's just a six

Super Member
Re: Turn-key L35 head package

Thanks for posted the chart.
What is the A/R on your turbine housing?


For one, the guy tested your heads w/a 4.155 " bore way too big & will give you inflated CFM numbers.
Good for you if you plan on using a Bowtie block or other aftermarket block w/a big bore. Then those flow numbers will apply.
They should have tested your heads w/a 4.0 -4.030 bore on the flow bench machine. Using the actual bore size your engine has on the flow bench machine will give you true CFM numbers for the bore size you actually have.
 
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GAShan

GAShan

Donating Member
Re: Turn-key L35 head package

Good to know. I had no idea what a lot of the numbers meant, that's why I posted the whole chart, to get the whole picture. I had an opportunity to get them done, I was owed a favor so I took advantage of it. If you see the date I've had the parts for the build on a shelf since 2002. If I ever put it all together I'll post some times. With all the trucks that are off the road I dread the idea of taking apart a reliable 12 second truck and creating issues I don't need.
 
WyoSyclone

WyoSyclone

Active member
Re: Turn-key L35 head package

wildphil said:
Has the rebuild started on the heads Rob?
Click to expand...

Hi Phil,
Looks like we're going to get started on them after the weekend. They're being hot-tanked and magnafluxed right now. I thinking about cryo-ing them, but not sure it would provide any real benefits.
 
wildphil

wildphil

I Love My Ty's
Re: Turn-key L35 head package

WyoSyclone said:
Hi Phil,
Looks like we're going to get started on them after the weekend. They're being hot-tanked and magnafluxed right now. I thinking about cryo-ing them, but not sure it would provide any real benefits.
Click to expand...


I'm anxious to see what you do on the head rebuild. And the outcome of the testing.

IMO skip the cryo on the heads. I don't think we would need that on our engines.

Keep us updated on your progress.
 
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