uphigh07

iTrader: (48)

ok guys i have a few ?'s for everyone have have found a few of my questions.

I have a 383 in my car with ls6 heads, and i just bought a set of AFR 225 largebore heads. My first questions is what head gasket would yall recomend? My bore is 3.905 and i know i need a 4.100 or bigger gasket. I will be maxing my d1sc procharger out. i should be boosting about 18 to 20 pounds so what head gasket should i go with.

Second question is i have an ls6 block i was told it was out of an 04 z06 and i am needing to know what head studs to order the pre 04 or the 04 and up is there any way i can find out what year my block is from a casting number or something?

Next question is would my stock rocker arms be fine with that power or do i need to get some others. If so what do yall recommend?

Thanks and let me know.

uphigh07

iTrader: (48)

bump anyone have any info

No Juice

iTrader: (11)

I would go with the GM MLS 5-layer LS3 gaskets or the GM MLS 7-layer LS9 gaskets. Not sure on the head studs but the rocker arms should be fine.

mike13

iTrader: (27)

why do you need a 4.10 or bigger gasket?

uphigh07

iTrader: (48)

i have large bore heads for 4.00 bore or more and my bore is only 3.905 but in order to run the heads the gasket must be 4.100 or larger on these heads.
Not exactly sure why that is just what i have read from everyone including tony mamo himself wich im sure you know he is the guy that does all the afr porting and stuff.


anyone else have any info on my ?'s

uphigh07

iTrader: (48)

ok i no this ? is probley a long shot but i only have like 3 to 5 tho miles on my patriot ls6 heads there 72 cc and my afr's are 72 cc would anyone know if i will need new pushrods without me checking them. im trying to get all my parts together as its my dd right now and i dont want it to be done for very long.

Like i said its probley a long shot but if anyone has an idea let me have your input.

uphigh07

iTrader: (48)

bump for the late night crowd

uphigh07

iTrader: (48)

bump to the top

mike13

iTrader: (27)

That's a tough call because your talking a production casting that is ported and a aftermarket casting.

99bluefirebird

iTrader: (8)

I am not understanding how you are going to run heads for a 4.1 bore on an engine with only a 3.905 bore? I thought you had to have the block machined if you wanted to do that, hence why noone runs L92 heads on a stock LS6 shortblock?

ss1

iTrader: (32)

People have been running large bore AFR225's on LS1's for a few years now. When they first came out the only thing available was the large bore design.

I believe the reason you can't run an L92 head on a LS1 is because of the 2.16" intake valve and small bore size. The reason you can run the AFR 225's on a LS1 is because they have a 2.08" valve.

As far as the gasket size goes, I can't help you with that. I can only tell you what I've read here and heard right from Tony myself is that you want the larger bore gasket for those heads.

bonestock99

iTrader: (1)

I'm not sure about the head gaskets but I do know that the studs are determined by the year of the heads not the block. The outermost two bolt holes in the middle row of the head, if they are machined deeper than the rest of the middle row then you need the studs for the earlier heads. If they are the same depth then get the later style studs. We ran into this on my buddies heads and noone could give us a straight answer, so there you go!

forcd ind

iTrader: (7)

on my 6.0, i swapped the pats. heads for the AFR 225's, used the same p/r's, their length was correct, 7.4 i think
i have an 04 6.0 sitting on the engine stand with studs, i had to buy diff ones for the stroker 6.0 because it was older than the 04
if you go on like summits site i think they might have a pic of the 2 diff studs
one uses longer ones that go deeper in the block, the other is closer to the deck-i can ck my 04 s/b in the morn, see which it has
the year block determines the length, not the heads

uphigh07

iTrader: (48)

thanks for the input guys, as far as the head studs goes it is by the block year for sure not the heads.

im just not sure what year my block is as the motor was in the car when i bought it and was told it was out of an 04 z06 none of the internals are stock which does not matter but i just need to know about the block.

I know for a fact that i need a 4.100 bore or bigger for the size i was just wondering about what head gasket to use with the setup i have.

As far as the pushrods go i will just not order any to be on the safe side and will just check once i put the heads on and hope i dont have to order any.

Thanks for the input so far please keep it coming

KILLER-LS1

iTrader: (18)

take one of the stock head bolts and thread it into one of the top right holes. if the bolt goes like 1/2" in before hitting the threads, you have the OLDER block. on the newer blocks, the all of the threads start right away and the bolts are all the same size.

also, i have a 4.010 bore and im using the LS9 gasket. that has more layers for boost and should work great for you.

uphigh07

iTrader: (48)

hey man thanks that stud answer you gave me was the last resort, its my current dd and i am trying to gather all the parts now so all i have to do is install it all and pray i dont run into something i have to order and wait a few days or a week on.

As far as the ls9 gasket i think that is what i will end up going with i have done some reasearch and it looks like no one is having problems with it at over 20 pounds of boost so i think that ? is answered.

uphigh07

iTrader: (48)

bump to the top

uphigh07

iTrader: (48)

bump for some more input

uphigh07

iTrader: (48)

bump to the top

uphigh07

iTrader: (48)

ordered the ls9 gaskets there on the way