NAVYBLUE210

Vic Jr can make 700+ Flywheel, Super Vic below ~675 Flywheel is not
Recommended, Stock RR with trunions should have less than ~.630" lift,
as instructed by CHE and many others. Open spring pressure is also
Limited to 400 if I remember correctly due to bolt clamping force.
Speed will/has specd the right cam for you.

dealrcn

Yes, you are correct on the valve reliefs. I went and picked the engine up today. Got the heads off of it. The pistons and cylinder walls look really good. Is there a post for DIY valve relief cutting? I really would like to try that on this engine. What head gaskets would you guys recommend for this buildup.

speedtigger

iTrader: (16)

Google Lindy Fly-cutter. They even rent the tool.

For gaskets, there really isn't anything better for your application than the factory gaskets.

dealrcn

Ok a few more questions. If I were to replace the stock pistons what engine kit/ brand would y'all recommend for my application? And about the VVT, do I need to just delete it all together and get a new timing gear and cover? What oil pump do y'all recommend for best pressure and volume if I'm deleting VVT? Thanks for all the input!!!

speedtigger

iTrader: (16)

I think Mahle makes some forged replacement pistons for use with the stock rods. Have a look at this part number: L92340065F04

For your application, I would delete the VVT. Here is what you need to do that:
http://www.cammotion.com/dod-vvt-del...vvt-delete-kit

On the oil pumps, I like this one:
http://www.cammotion.com/all-product...5-ls-oil-pump/

pantera_efi

iTrader: (1)

Hi, Dealrnc, your choice for the VVT Delete, though the most cost effective method is to install travel limiters, then just advance the cam for a low end torque increase.
The L-92 HV Oil Pump is GREAT, just shim the pressure valves.

I can provide Racetec Pistons/Rings at a great price .

I would like to have you try my IGN-8 sequential box.
I will give you a great price ?
I have a Holley (2) THREE Barrel carbs, 950 or 1050 with 4150 base.

Lance

dealrcn

Thanks guys for the info. I'm still leaning toward fly cutting these stock pistons. I would love to use the single plane drag race cam from cam motion. If I mill the heads I will need to compensate for the same amount in pushrod length, correct?

CAMMOTION PERF

Depends on how much you mill and how much your preload is now. In general, you can change the pushrod length by the same amount that you mill the heads if the preload is correct to start with.

dealrcn

I know you can't tell me exactly how much to mill but with the single plane cam using ls3 heads, factory head gaskets, stock rockers, stock L94 flat top pistons what do you think the approximate fly cut will be to achieve adequate clearance in combination of how much to mill the heads to achieve 11.5:1 to 12:1? Just a ball park idea.

CAMMOTION PERF

Most shops tell me they can mill the heads up to about .030" before they start to have intake fit problems. This seems to vary from person to person.

If you mill the heads .030", a .080" valve relief should give you plenty of room for your application if done correctly.

dealrcn

Would that be with the factory .051 head gaskets? Would that achieve the 11.5 or 12 to 1 compression? Do you guys have 7.370 pushrods?

fast89stang

iTrader: (2)

My heads were milled 050 with no intake issues. My pushrods were 7.375 length. The shop said even at .050, I still wasn't at 11.5-1 compression.

brian_cvit

my ls3 is 11.5-1

heads are milled .067 to 62ccs
-4cc valve relifes
piston .006 above deck
4.130x.040 head gasket

BTW have a trick flow single plane with a braswell 1.4x1.75 carb

pretty simple combo like runs 6.3x@114

thats 2410lbs race weight

fast89stang

iTrader: (2)

New combo will be a smaller version of your motor, aluminum 6.0, ported 823s, milled to clean up heads, but comp will be closer to 12-1. Still right at 2755-2800 lbs, Hoping for the very least 5.8s, but maybe some 5.7s in good air. With your 6.2 and good compression, you should hit your goal easily.

CAMMOTION PERF

We have 7.375" pushrods in stock.

http://www.cammotion.com/valve-train...eter-080-wall/

dealrcn

Thank you all for the info and advice, it's very helpful.

Danny

Doug G

6.2L 10.7 stock 69cc LS3 heads

Shaved .050 should be approx. 12.1 before fly-cuts.

My LQ4 w/ LS3 heads cut .050 used 7.250" pushrods

BUT.... MEASURE for your combo.

fast89stang

iTrader: (2)

They said mine at 050 was less than 11.5??? Idk. I know I should be close to 12-1 now for sure. LOL

Doug G

Displacement 6.2L / 376 c.i.d.
Bore Dia.............. 4.065 in.
Stroke.................. 3.622 in.
Head cc................ 69
Comp................... 10.7:1
Stock head gasket. .051
deck height............. 0
Dome .................... 0

https://www.summitracing.com/experta...on-Calculator/

NEstyle

iTrader: (1)

Fly cuts are so little volume. I measured a 0.070" deep LS3 intake valve fly cut done with a Lindy cutter. It was only 0.169cc, and that was after radiusing the edges nicely.