How Far Can GT-40 Heads Go

67GTA390 · 06-11-2003, 09:18 AM

I recently acquired a 90LX 5.0 5spd, and i was wondering about doing a head swap off a 93-97 explorer (correct me if im wrong) to get the Original Iron GT-40 heads. I know that they need to be milled a bit (to about 10:1), and if i were to port them and then put a ported Cobra intake on with a 70mm TB, BBK fenderwell Cold Air, 75mm MAF and a B-303 cam or another similar one from Anderson, what kinda times could i expect? The only things i have done to the car already is put a Pro 5.0 Shifter, subrame connectors, Lakewood adjustable upper and lowers, rear seat delete and Cowl Hood. How far could this combination be pushed if i put some ET Streets and practice my driving a lot? Thanks for any help you guys can give

Steve

PS Tublar Front K-Member is on its way also with lakewood Struts and Coilovers

BilLster · 06-11-2003, 10:28 AM

Ported GT-40 can get you into the 10.'s

Coupe Devil · 06-11-2003, 11:54 AM

Quote:

Originally posted by BilLster
Ported GT-40 can get you into the 10.'s

WOW.. now im really Jonesin to get my car together. I have a set of gt-40 irons I gotta start workin on.. I figure with the juice im a conservative 11 second car. .. When the 393 goes in Im couting on 10's..( opinons on using the ported gt-40's on the 393?????)

Bradley

Dark_5.0 · 06-11-2003, 12:56 PM

GT-40 heads with port work etc... are good for 10's easily. I know several people running 11's N/A with untouched GT-40 heads.

I wouldnt put GT-40's on a 393 though. They would definitely be a bottle neck. If I was building a big cube stroker like that I would go all out and get AFR 185's at least.

67GTA390 · 06-11-2003, 01:11 PM

Dark 5.0-

The people that are running in the 11's w/untouched GT-40's, what else do they have done to there motors/suspension, my goal is mid 11's N/A while retaining Smog certification, so there cars sound like what i would be aiming for

Steven

Thanks for the info

Dark_5.0 · 06-11-2003, 01:20 PM

Quote:

Originally posted by 67GTA390
Dark 5.0-

The people that are running in the 11's w/untouched GT-40's, what else do they have done to there motors/suspension, my goal is mid 11's N/A while retaining Smog certification, so there cars sound like what i would be aiming for

Steven

Thanks for the info

It would be very hard to stay streetable and run 11's with GT-40 heads.

The guys I know are running the stock short block with GT-40 heads, a custom cam and and the holley systemax intake.

These cars have no smog pump, A/c or power steering. You have to have a killer suspension set up and cut a 1.4-1.5 60ft in order to break into the 11's with the GT-40's

I highly doubt you could have a streetable 302 with GT-40 heads and smog legal and still run 11's.

67GTA390 · 06-11-2003, 01:38 PM

What do you think the car would run with the setup i talked about with a streetable cam?

Dark_5.0 · 06-11-2003, 03:35 PM

I would guess a mid- high 12 on slicks

Coupe50h · 06-11-2003, 10:01 PM

I run gt-40's off an 97 explorer, non p head, with the e-cam and explorer intake. the car is running strong, better now i got the idle worked out, my heads have some hefty machine work in them, except they were only milled .10, maybe 9.1 compression, and have stock springs, but they flow, just begging for a blower

btw, i have no new e.t.s yet with the ported explorer intake yet.

06-11-2003, 09:18 AM	#1
67GTA390 Registered Member Join Date: Jun 2003 Posts: 6	How Far Can GT-40 Heads Go I recently acquired a 90LX 5.0 5spd, and i was wondering about doing a head swap off a 93-97 explorer (correct me if im wrong) to get the Original Iron GT-40 heads. I know that they need to be milled a bit (to about 10:1), and if i were to port them and then put a ported Cobra intake on with a 70mm TB, BBK fenderwell Cold Air, 75mm MAF and a B-303 cam or another similar one from Anderson, what kinda times could i expect? The only things i have done to the car already is put a Pro 5.0 Shifter, subrame connectors, Lakewood adjustable upper and lowers, rear seat delete and Cowl Hood. How far could this combination be pushed if i put some ET Streets and practice my driving a lot? Thanks for any help you guys can give Steve PS Tublar Front K-Member is on its way also with lakewood Struts and Coilovers

06-11-2003, 10:28 AM	#2
BilLster Registered Member Join Date: Oct 2000 Location: Ontario canada Posts: 446	Ported GT-40 can get you into the 10.'s __________________ 89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .

06-11-2003, 12:56 PM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	GT-40 heads with port work etc... are good for 10's easily. I know several people running 11's N/A with untouched GT-40 heads. I wouldnt put GT-40's on a 393 though. They would definitely be a bottle neck. If I was building a big cube stroker like that I would go all out and get AFR 185's at least. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

06-11-2003, 03:35 PM	#8
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	I would guess a mid- high 12 on slicks __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

06-11-2003, 10:01 PM	#9
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	I run gt-40's off an 97 explorer, non p head, with the e-cam and explorer intake. the car is running strong, better now i got the idle worked out, my heads have some hefty machine work in them, except they were only milled .10, maybe 9.1 compression, and have stock springs, but they flow, just begging for a blower btw, i have no new e.t.s yet with the ported explorer intake yet. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

06-11-2003, 01:11 PM	#5
67GTA390 Registered Member Join Date: Jun 2003 Posts: 6	Dark 5.0- The people that are running in the 11's w/untouched GT-40's, what else do they have done to there motors/suspension, my goal is mid 11's N/A while retaining Smog certification, so there cars sound like what i would be aiming for Steven Thanks for the info

06-11-2003, 01:38 PM	#7
67GTA390 Registered Member Join Date: Jun 2003 Posts: 6	What do you think the car would run with the setup i talked about with a streetable cam?

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