Larger Intake Valve Cylinder Head Work

[Jagdpanzer]

For the 427 build I have underway will be going with 41.9 mm intake valves to increase air flow for feeding the the additional displacement. Here are a few photos of the work in progress for fitting the larger valves:
http://i540.photobucket.com/albums/gg333/pwasinger/0167572dd404c7d322f7cdd562917bc8cab6475f59_zps2qdq inmh.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/01a3caea38dbe4e7acfc17befaff75f78c02eb1231_zpsc0rk hp4o.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/0196accadc45f52a803213e61c8af40f127065056c_zps6iup b24v.jpg

Target combustion chamber size is 43.6cc which results 12:1 static compression ratio. For comparison stock combustion chambers run around 39cc. The "clover leaf" shape of the stock chambers severely shrouded the larger intake valve and was removed to allow for better airflow, especially at lower cam lift. Also radiused the area around the outside of the exhaust valves to take full advantage of the larger cylinder bore diameter.

[Roadster]

You do amazing work Phil.....great to have that talent to perform those tasks....will be anxious to see and hear the results of your build.....:)

[jss06c6]

Does anyone know if a 3D solid works (or similar) file exists for the LT 5 head? Would be very useful for designing modifications..

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[tpepmeie]

Excellent Phil. Looks like the Gen III chamber a bit. Hope the airflow numbers meet your target too.

[FU]

That's the ticket :cheers: What metal seats will you be using ?

[Jagdpanzer]

Seats are a tungsten alloy from Tucker.

[BigJohn]

Any loss of torque?

[Jagdpanzer]

Should have plenty.


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[oricale]

Looking great!

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[XfireZ51]

FourTwentySeven. Has a nice ring to it.

[5ABI VT]

Awesome !!!

[Jagdpanzer]

All set up to do some flow testing next week
http://i540.photobucket.com/albums/gg333/pwasinger/C40527FE-FC3C-46E2-A4F0-1CC7F5BA18D7_zpsf0lrclkf.jpg

http://i540.photobucket.com/albums/gg333/pwasinger/05A4D2D3-2836-49BB-9FE1-B4F5EA86B043_zps3rp0buud.jpg

[Jagdpanzer]

Will be using a Super Flow SF600 flow bench. Had to make this slider plate out of 1” acrylic plate to adapt the LT5 head to the flow bench testing port:
http://i540.photobucket.com/albums/gg333/pwasinger/Mobile%20Uploads/E8BF717F-478F-402D-A0B5-4D79EF0E3DF2_zpsehs1gyf9.jpg
All set to do some serious flow testing to see how the porting work and bigger intake valves perform.

[Scrrem]

Wow Phil! Amazing!!
Rich

[Roadster]

Again....amazing work Phil......has to be a great feeling going through this process......as others mentioned.....hoping you reach your target #'s......[emoji16]

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[secondchance]

Awesome!=D>

[lfalzarano]

Amazing work. Really impressed!


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[RussMcB]

Impressive. Enjoying your updates. Please keep them coming.

[5ABI VT]

Too awesome looking forwards to the results and thanks for sharing !! :cheers:

[HAWAIIZR-1]

You da man Phil! Wow!!!


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[A26B]

Love those velocity stacks & 3" primary tubes. Are you building a new GT car? Individual cylinder throttle body w/injector? Just kidding of course, but with you there's no half-stepping!
Awesome work Phil!

[mgbrv8]

Great work Phil

Dave

[Jagdpanzer]

Love those velocity stacks & 3" primary tubes. Are you building a new GT car? Individual cylinder throttle body w/injector? Just kidding of course, but with you there's no half-stepping!
Awesome work Phil!

Jerry,
Glad you like my home made velocity stacks.
Found them at Home Depot in the the plumbing department PVC pipe fitting section for $1.79. A little time on the lathe and Voila! Shop vac floor attachment tube was the donner for the primary exhaust extension pipe. Though it appears to be larger ID measures 2”

[Jagdpanzer]

Ran the flow test this morning
Here is the head mounted up on the SF-600 flow bench with test engineer Justin getting ready to hit the switch:
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0992_zps8wqgttvr.jpg

Flowing intake ports:
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0986_zpsuhgrl0bk.jpg

Flowing the exhaust ports:
http://i540.photobucket.com/albums/gg333/pwasinger/IMG_0988_zpsuzgs6ieu.jpg

And the results:
http://i540.photobucket.com/albums/gg333/pwasinger/PW%20LT5%20Cylinder%20Head%20Flow%20Graph%2020%20D ec%2017_zps3wnwehwl.jpg

Happy to report the achieved flow numbers were inline with expectations so the larger intake valves and additional porting work paid off. Was especially pleased with the flows at lower intake valve lift points. The shop that performed the test had never seen a LT5 head before and was very impressed. Said it was right up there with the best SBC LS aftermarket heads they've tested on a 4.125" cylinder bore.

[QB93Z]

Well Done Phil. Thanks for sharing this development with us.


Jim

[5ABI VT]

That is awesome !! Can’t say I’m all that familiar with LT5 flow numbers but have seen a few that aren’t that high that’s for sure ! Any before numbers or any stock numbers for reference ? Would be cool to graph it just for comparison purposes

[Pete]

Great Job Phil.:cheers:
Numbers look almost identical to the ones i have done 15 years ago with stock valves.

Just for comparison.

Intake
.300 275
.400 328
.450 337

Pete

[Jagdpanzer]

Thanks Pete
You are the LT5 porting expert, I am just a mere novice.

[Roadster]

Congrats Phil.....glad you reached your goal.....:handshak: