SOHC to DOHC conversion?

Red94Z · 11-02-2000, 12:51 AM

Hey all.
My pal with his 97 GT is looking to convert his top end from the GT's SOHC setup to a cobra DOHC setup.
What all is needed for this conversion?
Right now we have already gotten a deal on the new heads, cams, sprockets, covers, and that's about it.

Will we need new injectors and a differently calibrated Mass air sensor?

Thanks for any help. He really needs help catching me in my Z

(no offense intended, I only run 12s

)

------------------
T-Topped 1994 Z28
Not Stock

97snakedriver · 11-02-2000, 01:19 AM

Heads (cams, springs valves, ect), intake manifold, throttle body, sprockets, timing chains, timing chain covers, computer, wiring harness, MAF, 24 lb injectors, and it goes on. And even if he does do all that, the GT short block will have lower compression, so he still won't make as much power a stock Cobra motor.

It would be a lot cheaper and easier to either one, buy a Cobra engine (http://www.seanhylandmotorsport.com is a good place to look) or to add a blower and do some work to his existing engine.

MiracleMax · 11-02-2000, 01:41 AM

Hey did anybody see that piece on the steeda race car, it uses a cobra block and SOHC heads,. Would be kinda trick to build a 5.0 SOHC using the SHM block and the good FMS mod motor parts

T_Bone · 11-03-2000, 01:16 AM

Not even worth the effort. Just do what I did...sell the GT and buy the Cobra. A world of difference!

------------------
T-Bones 1997 Cobra
Wht/blk, Pro 5.0, 4.10's, aluminum driveshaft, FRPP throttle body, C&L MAF, K&N, off-road H, Flowmasters, s/f connectors, FRPP pro springs, BBK caster/cambers.

SMOKE · 11-03-2000, 01:45 PM

I agree with T-Bone. Just get a Cobra. Or ... buy a Cobra motor.

Go to www.stangparts.com. They sell the Cobra engine. If that's what you really want.

------------------
SMOKE Personalized Black 98 SVO Blown ROUSH
without the side exhaust

Mercury · 11-06-2000, 03:02 AM

Doesnt the cooling and oiling passages differ from the SOHC and DOHC? I was pretty sure they are diffrent. Can anyone shed any light on that?

97snakedriver · 11-06-2000, 04:43 AM

Cobra heads will mount to a GT block, and GT heads will mount to a Cobra block (the new Steedas for example).

The blocks do have some significant differences and the oil passages in the heads must be different, but they do match up from block to head.

11-02-2000, 12:51 AM	#1
Red94Z Registered Member Join Date: Apr 2000 Location: Ohio Posts: 15	SOHC to DOHC conversion? Hey all. My pal with his 97 GT is looking to convert his top end from the GT's SOHC setup to a cobra DOHC setup. What all is needed for this conversion? Right now we have already gotten a deal on the new heads, cams, sprockets, covers, and that's about it. Will we need new injectors and a differently calibrated Mass air sensor? Thanks for any help. He really needs help catching me in my Z (no offense intended, I only run 12s ) ------------------ T-Topped 1994 Z28 Not Stock

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11-02-2000, 01:19 AM	#2
97snakedriver Registered Member Join Date: May 1999 Location: Blacksburg, VA Posts: 1,526	Heads (cams, springs valves, ect), intake manifold, throttle body, sprockets, timing chains, timing chain covers, computer, wiring harness, MAF, 24 lb injectors, and it goes on. And even if he does do all that, the GT short block will have lower compression, so he still won't make as much power a stock Cobra motor. It would be a lot cheaper and easier to either one, buy a Cobra engine (http://www.seanhylandmotorsport.com is a good place to look) or to add a blower and do some work to his existing engine.

11-02-2000, 01:41 AM	#3
MiracleMax Registered Member Join Date: Apr 1999 Location: Hayes, Va, USA Posts: 798	Hey did anybody see that piece on the steeda race car, it uses a cobra block and SOHC heads,. Would be kinda trick to build a 5.0 SOHC using the SHM block and the good FMS mod motor parts

11-03-2000, 01:16 AM	#4
T_Bone Registered Member Join Date: Jul 2000 Location: Minot AFB, ND Posts: 207	Not even worth the effort. Just do what I did...sell the GT and buy the Cobra. A world of difference! ------------------ T-Bones 1997 Cobra Wht/blk, Pro 5.0, 4.10's, aluminum driveshaft, FRPP throttle body, C&L MAF, K&N, off-road H, Flowmasters, s/f connectors, FRPP pro springs, BBK caster/cambers.

11-03-2000, 01:45 PM	#5
SMOKE Old School ROUSH Join Date: Nov 1999 Location: Stockbridge, GA Posts: 531	I agree with T-Bone. Just get a Cobra. Or ... buy a Cobra motor. Go to www.stangparts.com. They sell the Cobra engine. If that's what you really want. ------------------ SMOKE Personalized Black 98 SVO Blown ROUSH without the side exhaust

11-06-2000, 03:02 AM	#6
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	Doesnt the cooling and oiling passages differ from the SOHC and DOHC? I was pretty sure they are diffrent. Can anyone shed any light on that?

11-06-2000, 04:43 AM	#7
97snakedriver Registered Member Join Date: May 1999 Location: Blacksburg, VA Posts: 1,526	Cobra heads will mount to a GT block, and GT heads will mount to a Cobra block (the new Steedas for example). The blocks do have some significant differences and the oil passages in the heads must be different, but they do match up from block to head.