how good are gt-40s
01-26-2007, 12:07 AM
#41
4th Gear Member
Join Date: Jun 2006
Location:
Posts: 1,892
RE: how good are gt-40s
yea his got some on his website i think... and im not ripping on alumimun heads... at least im not tryin to.... they are lighter which is a pro and there brand new so if there is something wrong with them u ship them bak rite away... kinda risk free... u are rite it is what u want... hell thumper even ports after market heads... got like .5 more outta some edalbrok heads if i remember rite
he sends this when u contact him... there is also stuff on the website under what the customer has to say but here u go
Some results w/Ported Heads 91 5.0 Hatch w/5 speed Stock Edlebrock 5.0 heads X cam and Carb 12.40s Thumper Ported Edlebrocks, cam advanced 4* 11.70s '84 5.0 Hatch w/5speed GT40's 8.68 (1/8 mile) Thumper Ported GT40s, cam advanced 4 degrees 8.08's Shifting at 5600 rpm!! (update.. from 13.70's to 12.20 shifting at 5800 rpm*) '92 5.0 Hatch w/5 speed Stock GT40s and Turbo 12.70s Thumper PORTED GT40s and no other bolt on made 11.90s '90 5.0 Hatch w/4 speed Toploader Stock E7s and stock cam 13.30s Thumper PORTED E7s and B cam installed 2* advanced 12.48 @ 108 mph '93 LX 5.0 5 speed stock E7s B cam (3.55 gears) 13.30 Thumper PORTED E7s w/1.7s (3.55 gears)4* advanced on Cam 12.80 @ 106 mph '91 Hatch 5.0 C4 ( PINKS WINNER ) GT40s Custom cam installed 110 ICL 13.70s Thumper PORTED GT40s cam advanced 6* 12.33 @ 108 mph '91 GT AOD 5.0 Thumper PORTED E7s and AOD w/3500 stall TFS1 Cam 4* advanced 12.90 Switched to an Edlebrock Performer 5.0 out of the box 12.80 (Example of Ported vs buying) Dont look at the ETs or the mph... just the increase in performance before and after, If the Edelbrocks or Trick flows dont seem to be making the performance you wanted.... port work "could" be the answer !! GT40s... and thinking of up grading and spending 1000.00 + in new heads?? Port work !! Those E7s suck!! Port work!! Check around, see what the new heads are costing AND all the add'l "stuff" to make those heads work ( push rods, headers ect...). Maybe the only thing you need is to have the existing heads Ported and Polished to knock off that 3 or 4 tenths !! or get that extra 30-50 RWHP !! ( HP numbers are heads only and may vary, more mods will equal more HP, the higher the quality of the Ports, less the improvements ) ET's and MPH supplied by customers.. IF no MPH shown, customer didnt provide! Thumper Performance http://thumperoforangepark.com
he sends this when u contact him... there is also stuff on the website under what the customer has to say but here u go
Some results w/Ported Heads 91 5.0 Hatch w/5 speed Stock Edlebrock 5.0 heads X cam and Carb 12.40s Thumper Ported Edlebrocks, cam advanced 4* 11.70s '84 5.0 Hatch w/5speed GT40's 8.68 (1/8 mile) Thumper Ported GT40s, cam advanced 4 degrees 8.08's Shifting at 5600 rpm!! (update.. from 13.70's to 12.20 shifting at 5800 rpm*) '92 5.0 Hatch w/5 speed Stock GT40s and Turbo 12.70s Thumper PORTED GT40s and no other bolt on made 11.90s '90 5.0 Hatch w/4 speed Toploader Stock E7s and stock cam 13.30s Thumper PORTED E7s and B cam installed 2* advanced 12.48 @ 108 mph '93 LX 5.0 5 speed stock E7s B cam (3.55 gears) 13.30 Thumper PORTED E7s w/1.7s (3.55 gears)4* advanced on Cam 12.80 @ 106 mph '91 Hatch 5.0 C4 ( PINKS WINNER ) GT40s Custom cam installed 110 ICL 13.70s Thumper PORTED GT40s cam advanced 6* 12.33 @ 108 mph '91 GT AOD 5.0 Thumper PORTED E7s and AOD w/3500 stall TFS1 Cam 4* advanced 12.90 Switched to an Edlebrock Performer 5.0 out of the box 12.80 (Example of Ported vs buying) Dont look at the ETs or the mph... just the increase in performance before and after, If the Edelbrocks or Trick flows dont seem to be making the performance you wanted.... port work "could" be the answer !! GT40s... and thinking of up grading and spending 1000.00 + in new heads?? Port work !! Those E7s suck!! Port work!! Check around, see what the new heads are costing AND all the add'l "stuff" to make those heads work ( push rods, headers ect...). Maybe the only thing you need is to have the existing heads Ported and Polished to knock off that 3 or 4 tenths !! or get that extra 30-50 RWHP !! ( HP numbers are heads only and may vary, more mods will equal more HP, the higher the quality of the Ports, less the improvements ) ET's and MPH supplied by customers.. IF no MPH shown, customer didnt provide! Thumper Performance http://thumperoforangepark.com
01-26-2007, 01:22 AM
#42
5th Gear Member
Join Date: Jul 2006
Location: Alton, New Hampshire
Posts: 2,518
RE: how good are gt-40s
ORIGINAL: OnyxCobra
No question you guys make good points, I guess it's all in what you want for your car. I personally think the sleeper look is over rated, nobody bought a Mustang to have the sleeper look, at least i dont think. When I hear sleeper i think a civic with a turbo, not a Mustang.
I dont think its all hype. These companies have proven themselves by making good cylinder heads. More flow doesnt always mean more HP, and yes ported GT40s might be cheaper but I dont think that's a good reason for people to rip on aluminum heads. I'd be surprised if thumper's ported GT40s were as nice as the AFR milling, they are so mint. Does anyone have any ET times from a ported GT40 car? I'd be interested to see some times.
No question you guys make good points, I guess it's all in what you want for your car. I personally think the sleeper look is over rated, nobody bought a Mustang to have the sleeper look, at least i dont think. When I hear sleeper i think a civic with a turbo, not a Mustang.
I dont think its all hype. These companies have proven themselves by making good cylinder heads. More flow doesnt always mean more HP, and yes ported GT40s might be cheaper but I dont think that's a good reason for people to rip on aluminum heads. I'd be surprised if thumper's ported GT40s were as nice as the AFR milling, they are so mint. Does anyone have any ET times from a ported GT40 car? I'd be interested to see some times.
Some results w/Ported Heads
91 5.0 Hatch w/5 speed
Stock Edlebrock 5.0 heads X cam and Carb
12.40s
Thumper Ported Edlebrocks, cam advanced 4*
11.70s
'84 5.0 Hatch w/5speed GT40's
8.68 (1/8 mile)
Thumper Ported GT40s, cam advanced 4 degrees
8.08's Shifting at 5600 rpm!!
(update.. from 13.70's to 12.20shifting at 5800 rpm*)
'92 5.0 Hatch w/5 speed
Stock GT40s and Turbo
12.70s
ThumperPORTED GT40s and no other bolt on made
11.90s
'90 5.0 Hatch w/4 speed Toploader
Stock E7s and stock cam
13.30s
ThumperPORTED E7s and B cam installed 2* advanced
12.48 @ 108 mph
'93 LX5.05 speed
stock E7s B cam (3.55 gears)
13.30
ThumperPORTED E7s w/1.7s(3.55 gears)4* advanced on Cam
12.80 @ 106 mph
'91 Hatch 5.0 C4( PINKS WINNER )
GT40sCustom cam installed 110 ICL
13.70s
Thumper PORTED GT40s cam advanced 6*
12.33 @ 108 mph
'91 GT AOD 5.0
Thumper PORTED E7s and AOD w/3500 stall TFS1 Cam 4* advanced
12.90
Switched to an Edlebrock Performer 5.0 out of the box
12.80
(Example of Ported vs buying)
Dont look at the ETs or the mph... just the increase in performance before and after,If the Edelbrocks or Trick flows dont seem to be making the performance you wanted.... port work "could" be the answer !!GT40s... and thinking of up grading and spending 1000.00 + in new heads??Port work !!Those E7s suck!!Port work!!
Check around, see what the new heads are costing AND all the add'l "stuff" to make those heads work ( push rods, headersect...).Maybe the only thing you need is to have the existing heads Ported and Polished to knock off that 3 or 4 tenths !!or get that extra 30-50 RWHP !! ( HP numbers are heads only and may vary, more mods will equal more HP, the higher the quality of the Ports, less the improvements )
ET's and MPH supplied by customers.. IF no MPH shown, customer didnt provide!
Thumper Performance
http://thumperoforangepark.com
01-26-2007, 06:07 AM
#47
2nd Gear Member
Join Date: Jan 2007
Location: Lincoln,NE
Posts: 420
RE: how good are gt-40s
hey thanks samseed101 and frdmstng1986GT for the info on the intakes. my friend is on a tight budget for is 89 LX and i told him the explorer intake was the way 2 go for a intake that is cheap and flows good now i have some proof cuz he was kinda skeptical.
01-26-2007, 03:16 PM
#48
5th Gear Member
Join Date: Jul 2006
Location: Alton, New Hampshire
Posts: 2,518
RE: how good are gt-40s
ORIGINAL: 89GTRed
Mac also makes a header that fits the gt 40 p. And yea the p started halfway through 97 and can also be identified by the 4 bars at the end instead of the previous 3 bars the reg gt 40 had. My question is are the "p" heads smog passable and what all is involved in getting them to pass. Will all the smog suff bolt right up? And will it all bolt right up to the reg gt 40? I have read up and Cant determine exactly what smog stuff will and will not fit right up on either. I have heard the p is passable but then also heard that there is a tube that the thermactor has and no hole for it in the p heads. Can anyone clear this up for me? Anyone know anyone that has dealt with either set of heads and know about the emmissions part? Thanx
Mac also makes a header that fits the gt 40 p. And yea the p started halfway through 97 and can also be identified by the 4 bars at the end instead of the previous 3 bars the reg gt 40 had. My question is are the "p" heads smog passable and what all is involved in getting them to pass. Will all the smog suff bolt right up? And will it all bolt right up to the reg gt 40? I have read up and Cant determine exactly what smog stuff will and will not fit right up on either. I have heard the p is passable but then also heard that there is a tube that the thermactor has and no hole for it in the p heads. Can anyone clear this up for me? Anyone know anyone that has dealt with either set of heads and know about the emmissions part? Thanx
01-26-2007, 05:39 PM
#49
3rd Gear Member
Join Date: Jun 2005
Location:
Posts: 694
RE: how good are gt-40s
as long as the gt40 heads have the theaded hole in the back of them for your air pump tube your good to go... as for thumpers work, he's top notch... i was very happy with mine... the only thing i can see as a plus side of getting an aluminum head is the weight savings. if i was building an all out drag car then hell yeah aluminum is the way to go (you can still have them ported too) but for a mild street car that will not see track use, ported gt40s are a great alternative. shoot you can even get gt40p's ported and drilled for the emissions tube (keep that in mind). in the end it's your money and your decision.
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