04goat350

iTrader: (1)

with 799 heads milled to 59 cc i believe they are LS6 stage 2.5 whats the biggest cam i can run without running into PTV Clearance. I currently have a 228R but I think I want something with a little more duration and a little more lift so make a little more power

Tainted

iTrader: (9)

Head gasket makes a difference too

98blueSScamaro

iTrader: (14)

with all cams and heads that milled you will need to cut.

R6cowboy

iTrader: (3)

Agree with 98blueSS, those heads milled to 59cc you will need to flycut to run any decent sized cam, there's no way around it. If you want a bigger duration cam then the 228R you will need to flycut pistons. Why bother with a thicker head gasket and loose your compression and performance, that's the whole point on milled heads. Just flycut the pistons, its easy to do and fairly inexpensive. Cost is $300 to flycut all 8 pistons at a local LSx shop near me.

senicalj4579

iTrader: (41)

My tea 243 stage 2 are 62cc with a 228 cam no cutting.
The builder was going to do prc 5.3 59cc with the same cam and that would have worked with no cutting.
Pretty sure 243 @ 59cc would be alot closer though.

98blueSScamaro

iTrader: (14)

or just rent the tool from chrs1313 and do ityour self

98blueSScamaro

iTrader: (14)

not something i would do it can be done but will it last??? i had a vindicator with stock ls6 long block. pullede the heads and all the pistons had little tap marks on them. if you plan to use the rpm band of the cam you pick and its close to 6700 i would cut and have about .080 for room and mostly on a stick car autos are safer due to less of a op to over rev.

96capricemgr

iTrader: (1)

Are the chambers machined? If they are then it is that much more milling that had to be done to get them down to 59cc and that much less PTV you would have because of such.

Guessing you think they are PRC stage 2.5 as those are popular????? in which case they also have slightly larger valves too further limiting PTV

dr_whigham

iTrader: (49)

Hold on guys...

My cam is a 229/236 112+2. My AFR's are at 59cc. No need to flycut. You can't just throw a blanket statement out like "If it's bigger than a 228 you HAVE to flycut" bc it's simply not true.

MEASURE. That's the only way to know.

senicalj4579

iTrader: (41)

IDK about it to much. All I know is the sponsor who did my car does alot of 5.3 59cc heads with his 228 cam. He says its the biggest cam to use before cutting. Many people have the same setup. Thats all I can really say.
I hope my 62cc 243s and 228/232 is going to last. Mine is spinning to 6600-6800. Somewhere in there.

427zm

iTrader: (9)

Your deck on those AFR's started at 3/4 of an inch. You had more room for milling. Measuring is best, but this isn't an apples to apples example. Your nice aftermarket heads will not carry the same clearance issues as stockers.

98blueSScamaro

iTrader: (14)

winner alot of people dunno about the effect of the bigger valve and opening the chamber for more valve and room and then getting the head back down to size.

98blueSScamaro

iTrader: (14)

and yes deck is far greater then any stocker. valve size and so on. only to tell is to mic it. i say anything over 65 is good anything over 80 is gold.

KCS

iTrader: (20)

What do think happens when you cut valve reliefs?

chrs1313

iTrader: (24)

Haha take it easy on him

I would take the compression drop from a .013 flycut vs a compression going from a .040 cometic to a stock .053"

Just stirring the pot, :brew:

Wanna make more power, mill, flycut and then add a thinner gasket, free hp

SMOKNSS

iTrader: (3)

Just about every cam, head, and head gasket that I have put together or seen has been different. Something that can cause problems like bent valves, busted pistons and etc., I ALWAYS check just to make sure.

Whatever cam you run, I would measure it. Its not very hard, just take your time and make it right.

98blueSScamaro

iTrader: (14)

Merica

96capricemgr

iTrader: (1)

Why are you two bringing up chamber size of DIFFERENT CASTINGS what does that have to do with anything?

dr_whigham

iTrader: (49)

B/C we're trying to get our post count up like you

All I'm saying is with larger valves, the same valve angle & the same CC, I was able to run a larger cam. If you take the time to read my last sentence, you'll also see where I explicitly state to MEASURE.

98blueSScamaro

iTrader: (14)

well let's see bigger chamber or reworked from stock means more cc's. SO more cc's mean you haveto mill the head more to get the cc's down to what you want. and with doing just that you bring the valve closer to the piston.