head swap question need help asap

Desperado · 11-09-2005, 11:27 PM

ok i just purchased a set of gt40 heads and the 1.72 factory crane roller rockers from a 94 cobra. i will be bolting these onto my 87 mustang. will i need to shim the rockers or get different push rods or will my stock push rods work with them. the pedistals and bolts come with the rockers that were used on the gt40's in the cobra.

also what kind of power increase is normal for swaping e7's out with gt40's and the 1.72 roller rockers?

Dark_5.0 · 11-10-2005, 09:19 AM

Shimming probably isnt necessary. They should just bolt down and be good to go.

They are a decent upgrade over E7's but not huge. My guess would be about 10-12 RWHP with the added lift of the 1.72 rockers and the GT40 heads.

If you still have the stock intake port the lower intake and there is even more HP to be had.

Desperado · 11-10-2005, 04:43 PM

i have the performer rpm intake, equal length shorty headers, off road h-pipe, mac cat back, under drive pullies, 65mm tb and 4.10 gears. hopefully it will be a good performance upgrade. still hope it will be a good upgrade

11-09-2005, 11:27 PM	#1
Desperado Registered Member Join Date: Mar 1999 Location: dallas, tx United states Posts: 20	head swap question need help asap ok i just purchased a set of gt40 heads and the 1.72 factory crane roller rockers from a 94 cobra. i will be bolting these onto my 87 mustang. will i need to shim the rockers or get different push rods or will my stock push rods work with them. the pedistals and bolts come with the rockers that were used on the gt40's in the cobra. also what kind of power increase is normal for swaping e7's out with gt40's and the 1.72 roller rockers? __________________ Desperado

11-10-2005, 09:19 AM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: head swap question need help asap Shimming probably isnt necessary. They should just bolt down and be good to go. They are a decent upgrade over E7's but not huge. My guess would be about 10-12 RWHP with the added lift of the 1.72 rockers and the GT40 heads. If you still have the stock intake port the lower intake and there is even more HP to be had. __________________ 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

11-10-2005, 04:43 PM	#3
Desperado Registered Member Join Date: Mar 1999 Location: dallas, tx United states Posts: 20	Re: head swap question need help asap i have the performer rpm intake, equal length shorty headers, off road h-pipe, mac cat back, under drive pullies, 65mm tb and 4.10 gears. hopefully it will be a good performance upgrade. still hope it will be a good upgrade __________________ Desperado

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