Stock Head Flow #'s
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Joined: Dec 2001
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From: new england
Re: Stock Head Flow #'s 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]" />
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]" />
TECH Addict
Joined: Dec 2001
Posts: 2,298
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From: new england
Re: Stock Head Flow #'s 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.
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From: Houston, Tx
Re: Stock Head Flow #'s [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
<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
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Joined: Dec 2001
Posts: 2,298
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From: new england
Re: Stock Head Flow #'s 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
Re: Stock Head Flow #'s <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]" />
http://harlan.sketchy.net/head_flow.html
<img src="graemlins/formula.gif" border="0" alt="[Pontiac]" />
Thread Starter
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From: Houston, Tx
Re: Stock Head Flow #'s 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
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