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?
Printable View
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?
<div class='quotetop'>QUOTE(Jaw_Dropper @ Mar 29 2007, 05:19 PM) [snapback]87740[/snapback]</div>Quote:
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'll just ask someone on Ls1.com instead i bet i'll get a faster reply
what size engine is this going on?
Someone must be a little grumpy today!
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.
<div class='quotetop'>QUOTE(Jaw_Dropper @ Mar 29 2007, 06:09 PM) [snapback]87745[/snapback]</div>I have a 4.8L in my truck right now but i'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.Quote:
Nevermind i'll just ask someone on Ls1.com instead i bet i'll get a faster reply
[/b]
<div class='quotetop'>QUOTE(vv8 @ Mar 29 2007, 08:27 PM) [snapback]87763[/snapback]</div>Quote:
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 :lol:
Cool thing is I know this place is..... I figured thats the best way to get the fastest response! :lol:
<div class='quotetop'>QUOTE(Jaw_Dropper @ Mar 29 2007, 11:50 PM) [snapback]87778[/snapback]</div>I DON'T THINK YOU CAN GO THAT BIG ON THE 4.8/5.3, BUT THE 6.OL SHOULD HOLD IT.Quote:
I have a 4.8L in my truck right now but i'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 :lol:
Cool thing is I know this place is..... I figured thats the best way to get the fastest response! :lol:
[/b]
JAMEST
What if i bored my cast iron block out to a 5.7... still no?
<div class='quotetop'>QUOTE(Jaw_Dropper @ Mar 31 2007, 02:10 PM) [snapback]87951[/snapback]</div>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.Quote:
What if i bored my cast iron block out to a 5.7... still no?
[/b]
JAMEST
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'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'd go no larger than a 2.02" as it'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't listen to anyone, do what you want, spend cash, and get the smack down put upon you.