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Old 08-03-2006, 06:07 PM   #1
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Question Gt40 HEADs and stock PushRods ?

Hey guys...im new to corral but not new to stangs. Anyways here's my issue. I am putting iron gt-40's on in a couple weeks and they are going to the machine shop next week for prep. Im getting a 3 angle valve job, new seals and they are shimming all the springs for consistent height. I am considering having the heads milled about 20 thou to compensate for the massive combustion chambers 65.5cc. I want to keep about a 9.5:1 compression ratio and i currently have 10:1. How much do i really need to mill off the heads to make up that .5 points. Also Will I be able to use my current pushrods? I will be using my current comp cams pro magnum rockers, and my current comp cams springs. They are not stock length pushrods, but they were measured for my stock e7's and the valvetrain setup i mentioned above. Steeda # 18 cam..and that will also remain in the car. I dont think the stock heads were milled at all so Im thinkin the PR length should be ok. Let me know what you all think! thanks in advance.
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'91 red GT 5-spd. Built/Balanced 306, forged SRP pistons-10:1 CR, steeda # 18 cam, Lightly worked E7's, Explorer Intake, 65mm TB and EGR, 75mm Pro M, 24# inj. Comp cams pro magnum 1.6 rockers, Comp Cams springs, Hardened Push rods, UD Pullies, Smog Delete, 3g Alt, PS92 coil, FMS shorties, MAC O/R H pipe, 2.5" 40 series flows, Spec Stage 2, 3.73's, Pro 5.0 shifter, Full length SFC's...etc
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Old 08-03-2006, 06:57 PM   #2
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Anyone?!?! ttt
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'91 red GT 5-spd. Built/Balanced 306, forged SRP pistons-10:1 CR, steeda # 18 cam, Lightly worked E7's, Explorer Intake, 65mm TB and EGR, 75mm Pro M, 24# inj. Comp cams pro magnum 1.6 rockers, Comp Cams springs, Hardened Push rods, UD Pullies, Smog Delete, 3g Alt, PS92 coil, FMS shorties, MAC O/R H pipe, 2.5" 40 series flows, Spec Stage 2, 3.73's, Pro 5.0 shifter, Full length SFC's...etc
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Old 08-04-2006, 05:58 PM   #3
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so no-one has any experience with milling gt-40's or any experience with pushrods on these heads?
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'91 red GT 5-spd. Built/Balanced 306, forged SRP pistons-10:1 CR, steeda # 18 cam, Lightly worked E7's, Explorer Intake, 65mm TB and EGR, 75mm Pro M, 24# inj. Comp cams pro magnum 1.6 rockers, Comp Cams springs, Hardened Push rods, UD Pullies, Smog Delete, 3g Alt, PS92 coil, FMS shorties, MAC O/R H pipe, 2.5" 40 series flows, Spec Stage 2, 3.73's, Pro 5.0 shifter, Full length SFC's...etc
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Old 08-04-2006, 09:15 PM   #4
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I have GT-40 marine heads with 22 thou milled off,.. I'm also using stock E-7
pushrods. With 1.7 rockers. Motor runs fine with 14lbs of boost running thru it. You WILL need a different retainer per my experience.
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Old 08-04-2006, 09:21 PM   #5
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You should always measure!
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Old 08-04-2006, 10:43 PM   #6
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Now i have heard of needed a different exhaust retainer? is that correct? what is the reason for that...some type of rocker clearence issue? thanks guys
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'91 red GT 5-spd. Built/Balanced 306, forged SRP pistons-10:1 CR, steeda # 18 cam, Lightly worked E7's, Explorer Intake, 65mm TB and EGR, 75mm Pro M, 24# inj. Comp cams pro magnum 1.6 rockers, Comp Cams springs, Hardened Push rods, UD Pullies, Smog Delete, 3g Alt, PS92 coil, FMS shorties, MAC O/R H pipe, 2.5" 40 series flows, Spec Stage 2, 3.73's, Pro 5.0 shifter, Full length SFC's...etc
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Old 08-06-2006, 11:17 AM   #7
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Right,.. MIGHT be ok with stock rockers or 1.6's but, just roll the motor by hand & see if you need the off-set retainer.
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Old 08-06-2006, 10:57 PM   #8
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I'm using stock pushrods with my gt40s and svo 1.6s
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