the_merv

iTrader: (88)

I know the stock Valve sizes are 2.16/1.59, and that with a 4.000" Bore that the Exhaust side is really close to the Cylinder Wall.

My question is can the Exhaust be made larger with a larger Cylinder Bore to get more clearance? Is there enough clearance in the Head Chamber as well to accomodate say a 1.62 Valve?

Has this or something similar been tried?

the_merv

iTrader: (88)

Anyone have any insight on this..

quik406

Why bigger?

the_merv

iTrader: (88)

To get that Exhaust out faster, pick up a little more top-end..

The 243 Heads use a 2.02/1.62 I believe, and they are pretty damn good with a LS6 Intake and the right Cam.

I'm interested to see what a set of L92's would do with a 2.16/1.62 Valve combo..just an idea..

WKMCD

iTrader: (2)

One of the issues with the L92/LS3 heads is the exhaust valve shrouding. You can see the difference even between the LS2 and L92 stroker builds. That little bit of extra bore helps unshoud the valve. Increasing the size of the exhaust valve increases the shrouding. Not a good thing.

the_merv

iTrader: (88)

What exactly do you mean by Shrouding.. is it the way everything flows around in the Combustion Chamber..?

Robin L

I don't think that the LS2 valve is larger than the L92. You might want to check that info. I am not near my specs and I don't remember.

I have a LS2 with LS3 heads on the dyno right now. I was amazed at the power. It has a Lunati 212/218 113 cam and a 4 barrel intake. It makes 530 at the crank with 1 3/4" Hooker F Body headers. I will have L76 intake numbers after I get back from PRI.

Robin

the_merv

iTrader: (88)

I just looked it up, it's a 1.55" Valve..I thought it was bigger. I guess the L92's are pretty decently sized, must be the ones I was thinking of were the LS7's 1.62 Exhaust.

1CAMWNDR

iTrader: (21)

No real need for a larger valve. Use the largest bore block you can. Get a good valve job and port the exhaust if you want more flow. Make sure you get a good cam for those heads also. There are a some different opinions on how much split you need.

the_merv

iTrader: (88)

I'm running a close-split Cam, and I'm one of the few that is on here, I guess the trend now is a wide-split.

WKMCD

iTrader: (2)

Not necessarily.