Head flow #s/ Cam selection?
Thread Starter
Joined: Feb 2004
Posts: 621
Likes: 1
From: Bridge City,Tx
Head flow #s/ Cam selection? I had a set of heads flowed this weekend to find out what I really had. Bought a used set of 853 casting heads that have basically a stage 1 cnc port job. Nothing real fancy, but were reasonably priced for a budget build. 853 castings,stainless 2.02s-1.57s, light port job.
Flow sheet #s
Valve lift Intake Exhaust
.050 33.4 25.5
.100 66.9 51.0
.150 100.3 76.6
.200 134.3 102.1
.250 165.0 120.5
.300 195.6 138.9
.350 220.8 154.7
.400 245.8 170.5
.450 266.5 181.5
.500 281.7 188.5
.550 282.2 194.9
.600 280.4 199.5
Craig at GTP Racing in Houston,Tx flowed these for me. These are real world #s and are about what I expected. I'm about to do a engine swap with an 02 shortblock, these heads, QTP longtubes & 3" ORY, LS6 intake, SLP dual/dual catback, Vigilanti 3600 conv, 3.42s, and undetermined cam specs.
Hoping to get the 98 Z28 , A4, full weight car into the mid to upper 11s and still be very driveable. and keep RPMs 6400-6600 max!
I'm open for suggestions and comments. What do ya'll think?
Thanks Floyd
Flow sheet #s
Valve lift Intake Exhaust
.050 33.4 25.5
.100 66.9 51.0
.150 100.3 76.6
.200 134.3 102.1
.250 165.0 120.5
.300 195.6 138.9
.350 220.8 154.7
.400 245.8 170.5
.450 266.5 181.5
.500 281.7 188.5
.550 282.2 194.9
.600 280.4 199.5
Craig at GTP Racing in Houston,Tx flowed these for me. These are real world #s and are about what I expected. I'm about to do a engine swap with an 02 shortblock, these heads, QTP longtubes & 3" ORY, LS6 intake, SLP dual/dual catback, Vigilanti 3600 conv, 3.42s, and undetermined cam specs.
Hoping to get the 98 Z28 , A4, full weight car into the mid to upper 11s and still be very driveable. and keep RPMs 6400-6600 max!
I'm open for suggestions and comments. What do ya'll think?
Thanks Floyd
are the exh.numbers flowed with a pipe?JMO,but i would flow the heads with the ls6 intake in place and the exh. thru a pipe,this will get you a more accurate idea of what the heads flow installed.that would give a cam grinder a better idea of what would work best.futral cams does custom grinds,as do some other sponsors on here.
Thread Starter
Joined: Feb 2004
Posts: 621
Likes: 1
From: Bridge City,Tx
Originally Posted by 66deuce
are the exh.numbers flowed with a pipe?JMO,but i would flow the heads with the ls6 intake in place and the exh. thru a pipe,this will get you a more accurate idea of what the heads flow installed.that would give a cam grinder a better idea of what would work best.futral cams does custom grinds,as do some other sponsors on here.
Originally Posted by floman
The exhaust #s were not with a pipe, he indicated that #s with a straight pipe in place are deceiving when compared to a actual header tube that turns 90 degrees abruptly off of the port?
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TECH Addict
Joined: Dec 2001
Posts: 2,298
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From: new england
Originally Posted by 66deuce
i didn't think about that.i always thought it was better to flow the exh. with a pipe,as some porters that post on here have stated.but Craig @ GTP knows a lot more than me.
TECH Resident
Joined: Sep 2003
Posts: 848
Likes: 1
From: Working in the shop 24/7
Originally Posted by floman
The exhaust #s were not with a pipe, he indicated that #s with a straight pipe in place are deceiving when compared to a actual header tube that turns 90 degrees abruptly off of the port?
Flow Pipe
Ed
Floyd,
Like I mentioned before, theFutral F13 or MTI G1 are my favorites for your application. Can't go wrong with either as they are very similar.
Like I mentioned before, theFutral F13 or MTI G1 are my favorites for your application. Can't go wrong with either as they are very similar.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
