Marty

Anybody flowed any stock heads? If so what did they flow(and at what lift)?

LS1derfull

LS1 stock castings @28"
Int. Exh.
.200"=137cfm .200"=104cfm
.300"=136
.300"=187cfm .350"=150
.350"=207 .400"=165
.400"=223 .450"=172
.450"=228 .500"=179
.500"=237 .550"=183
.550"=242 <img src="graemlins/burnout.gif" border="0" alt="[Burnout]" />

LS1derfull

Had a little trouble with page setup, first .300"
reading is exhaust flow

BIGBOS

What are the stock valve sizes?

Marty

[quote]Originally posted by BIGBOS:
<strong>What are the stock valve sizes?</strong><hr></blockquote>

2.00/1.52

Marty

anybody flowed them to .600

[ January 13, 2002: Message edited by: Marty ]</p>

LS1derfull

Marty i have the .600" #s somewhere but i cant find them, If you look at the flow curve youll see gains tapered off at .550, starting to choke so i would guess to say 246cfm and 186cfm.

Marty

[quote]Originally posted by LS1derfull:
<strong>Marty i have the .600" #s somewhere but i cant find them, If you look at the flow curve youll see gains tapered off at .550, starting to choke so i would guess to say 246cfm and 186cfm.</strong><hr></blockquote>


Thanks Bud,
Hey is you do find the exact #'s please post 'em

Jason99T/A

iTrader: (21)

[quote]Originally posted by Marty:
<strong>

2.00/1.52</strong><hr></blockquote>

Actually, they are 2.00/1.55

Marty

[quote]Originally posted by Jason99T/A:
<strong>

Actually, they are 2.00/1.55</strong><hr></blockquote>

my bad, it was a guess

BIGBOS

Some stage 2 heads offer 2.02/1.57 valves it doesn't seem like that big of a difference... <img src="images/icons/confused.gif" border="0">

LS1derfull

Bigbos, SAM(Judson) has gotten 290cfm intake and 210+ exhaust with 2.02 and 1.6 valves, so valve size isnt as important as port work to making good #'s. Big valves need bigger than 3.900" bore block also, thats a big commitment.IMO

y2khawk

iTrader: (5)

<img src="gr_grin.gif" border="0"> ARE's number from GMHTP

http://harlan.sketchy.net/head_flow.html

<img src="graemlins/formula.gif" border="0" alt="[Pontiac]" />

Marty

Thanks a bunch Guys,
Couple more questions.

1) Anybody know what the stock 5.3's flow?

2) I know the 6.0 heads are said to be similar to the ls6 heads, do they flow the same? If not then what do they flow?

3) How much would you have to mill the 6.0 head to achieve 11/1 comp. w/ stock pistons?

4) What all do you have to change after milling heads(pushrods?)?

Marty