2.08 intake and 1.60 exhaust valves...?

[Jaw_Dropper]

I have a pair of 5.3L heads with the cast number "862"

Can i get the heads milled out to fit 2.08 intake and 1.60 exhaust valves?

[Jaw_Dropper]

<div class='quotetop'>QUOTE(Jaw_Dropper &#064; Mar 29 2007, 05&#58;19 PM) [snapback]87740[/snapback]</div>

I have a pair of 5.3L heads with the cast number "862"

Can i get the heads milled out to fit 2.08 intake and 1.60 exhaust valves?
[/b]

Nevermind i&#39;ll just ask someone on Ls1.com instead i bet i&#39;ll get a faster reply

[bluecajun5.3]

what size engine is this going on?

[GMCwantsLS1]

Someone must be a little grumpy today&#33;

[vv8]

no you cant, too large of a valve for a 5.3 bore 3.77 with those valve sizes it puts you at 3.68, you do the math, and ls1.com has nothing on this or any other site. good luck.

[Jaw_Dropper]

<div class='quotetop'>QUOTE(Jaw_Dropper &#064; Mar 29 2007, 06&#58;09 PM) [snapback]87745[/snapback]</div>

Nevermind i&#39;ll just ask someone on Ls1.com instead i bet i&#39;ll get a faster reply
[/b]

I have a 4.8L in my truck right now but i&#39;m planning to go with a cast iron 6.0L longblock. I was thinking i could slap them on my daily for awhile then when the time comes put it on the bigger motor.


<div class='quotetop'>QUOTE(vv8 &#064; Mar 29 2007, 08&#58;27 PM) [snapback]87763[/snapback]</div>

no you cant, too large of a valve for a 5.3 bore 3.77 with those valve sizes it puts you at 3.68, you do the math, and ls1.com has nothing on this or any other site. good luck.
[/b]

LoL

Cool thing is I know this place is..... I figured thats the best way to get the fastest response&#33;

[Jamest]

<div class='quotetop'>QUOTE(Jaw_Dropper &#064; Mar 29 2007, 11&#58;50 PM) [snapback]87778[/snapback]</div>

I have a 4.8L in my truck right now but i&#39;m planning to go with a cast iron 6.0L longblock. I was thinking i could slap them on my daily for awhile then when the time comes put it on the bigger motor.
LoL

Cool thing is I know this place is..... I figured thats the best way to get the fastest response&#33;
[/b]

I DON&#39;T THINK YOU CAN GO THAT BIG ON THE 4.8/5.3, BUT THE 6.OL SHOULD HOLD IT.


JAMEST

[Jaw_Dropper]

What if i bored my cast iron block out to a 5.7... still no?

[Jamest]

<div class='quotetop'>QUOTE(Jaw_Dropper &#064; Mar 31 2007, 02&#58;10 PM) [snapback]87951[/snapback]</div>

What if i bored my cast iron block out to a 5.7... still no?
[/b]

IM NOT SURE? I KNOW THE L92 HEADS WILL NOT FIT, BUT GMPP IS MAKE A SMALLER VERSION FOR THE 5.3 AND THE 5.7. RED CAN YOU CHIME IN ON THIS ONE. ASK REDHEARTBEAT HE USUALLY KNOWS. YOU MAY HAVE TO E-MAIL HIM.



JAMEST

[Hit Man X]

LOL, why the hell would you want a 2.08" valve on a 4.8? Are you trying to kill what limited bottom end you have?

Anyway, as Kevin said you&#39;ll see ZERO gains and hurt yourself with this. You can make more than enough power to destroy your rear axle, ujoints, and trans with a 1.89 intake valve on the 4.8/5.3 head. A 6.0 I&#39;d go no larger than a 2.02" as it&#39;s a 4" bore. To run something 2.08" and greater you need a huge bore (4.06+) to unshroud the valve and keep port velocity up.

Or, don&#39;t listen to anyone, do what you want, spend cash, and get the smack down put upon you.