GMPP LS6 Head Flow Numbers.
Thread Starter
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
GMPP LS6 Head Flow Numbers.
I had my GMPP ls6 heads flowed at a local engine builder. The heads had some additional work done in the bowl by the previous owner and the exhaust ports have been hand sanded. I opted not to have the intake runners sanded, and valves are stock. The cam I will be using has .573/.580 lift Her are the numbers. Comments please.
Superflow SF-600. Tested @ 28" H20. No manifold.
Intake Exhaust
.200 150 116
.300 222 158
.400 261 189
.500 282 214
.600 291 218
Superflow SF-600. Tested @ 28" H20. No manifold.
Intake Exhaust
.200 150 116
.300 222 158
.400 261 189
.500 282 214
.600 291 218
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Re: GMPP LS6 Head Flow Numbers. (Greg_E)
If they aren't mounted yet I would sent them out for a bigger valve (2.02/1.57). It will not require new seats and you will get a fresh multi-angle valve job. Use undercut valves for more flow. You will be able to sell the LS6 stockers. With a big cam and these heads you will benefit a lot from gearing.
Thread Starter
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Re: GMPP LS6 Head Flow Numbers. (SpinMonster)
How much are we talking for the larger valves and installation? The heads we're bought second hand but have never been installed. I was trying to keep this somewhat low budget. I probably woud have chosen a set of stage II heads if I was going to spend the extra cash and with that additional mod I would probably be up to or over that price. (With a set of heads that have already been milled .055") . I'm not sure it would be worth it at this point. Thanks for the reply!
[Modified by Greg_E, 10:26 PM 10/10/2003]
[Modified by Greg_E, 10:26 PM 10/10/2003]
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Re: GMPP LS6 Head Flow Numbers. (Greg_E)
I have the GMPP LS6 heads with 2.02/1.57 valves.These heads are milled 0.055 " at the time of CNC by LPE. Combustion chambers are 58.5 cc.Intake runners are large at around 240 cc. Here's a link to my before and after flow numbers . Before is as received from Scoggin Dickey. After is with new 2.02 and 1.57 REV valves and additional hand-sanding by LPE. http://img.villagephotos.com/p/2003-...ngenfelter.GIF. They flow well. With test pipe I believe. :yesnod: :thumbs:
[Modified by binksZ06, 11:54 PM 10/10/2003]
[Modified by binksZ06, 11:54 PM 10/10/2003]
Thread Starter
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
Re: GMPP LS6 Head Flow Numbers. (kh24)
I was hoping to see slightly better flow numbers @ .500 and up but they will be OK for what I'm doing. I compared the numbers to those posted from SDPC and MTI, in J-Rod's spreadsheet, and mine for the most part are as good or slightly better. Thanks to everyone that repied :cheers:
