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#1 |
Registered Member
Join Date: Sep 2000
Location: rock hill,S.C. 29730
Posts: 420
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![]() I went ahead and took off the heads, so now I want to port & Mill them some.I'd like to gain as much power as I can with them so how much should I mill them?How much can I mill them without having to worry about them ling up with the intake correctly?I'd like to get 10.5 to 1 (est.) is that too high?How much should be milled for that?
Also I'm removing the thermactor bump and opening up the ports on the exhaust and gasket matching the intake to the heads, anything else?I think I read that it does no good to mess with the intake side of the heads and you'll make them worse if you don't know what your doing, which I basicly don't. By the way I'm running stock cam,I figure cam not much value with stock intake and heads plus I'm still speed density. Thanks guys Wes
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88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ |
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#2 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() .030 is the most we normally go. I do know people that have gone .040.
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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#3 |
Get down.....
Join Date: Apr 2001
Location: Room 103
Posts: 2,095
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![]() ok ski here is goes:
OE E7 heads have roughly 64cc chamber and the compression ratio is 8.80:1(advertised at 9.0:1 but not true) shave the head .10"=62.4 cc and 8.96:1 .20"=60.92cc and 9.12:1 .25"=60.15cc and 9.2:1 .30"=59.38cc and 9.3:1 .35"=58.61cc and 9.37:1 .40"=57.84cc and 9.46:1 roughly each half point in compression increase equals roughly 15 horses. the max you can go on the E7 would be .40" and you dont have to cut the intake either if you go that high. port out the exhaust roof and work the exhaust bowls. i was told to leave the intake alone, but if you wanted to, port match the intake. sorry, no 10.5:1 for you unless you get different pistons. also, ALWAYS check valve to piston clearence!!!!!!! ![]()
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Cobra brakes are on! Finally..... ------------------------------------------------ |
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#4 |
Get down.....
Join Date: Apr 2001
Location: Room 103
Posts: 2,095
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![]() oh yeah, listen to workcar. sorry, didnt mean to take your spotlight of fame buddy!
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Cobra brakes are on! Finally..... ------------------------------------------------ |
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#5 |
Registered Member
Join Date: Oct 2002
Location: Eastern N.C.
Posts: 50
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![]() Why is .040 the max on an E7?
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#6 |
Get down.....
Join Date: Apr 2001
Location: Room 103
Posts: 2,095
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![]() after that you will definetly have valve to piston interference and also you then have to machine your intake.
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Cobra brakes are on! Finally..... ------------------------------------------------ |
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#7 |
Registered Member
Join Date: Oct 2002
Location: Eastern N.C.
Posts: 50
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![]() My heads were shaved .050 and I have keith black flat tops with no interference, cobra intake didnt have to be shaved either. Im just saying that it worked for me with no problems.
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#8 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() Cb93, this is good to know, the most that I have heard of was .040, what cam do you run and how fast is the car?
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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#9 |
Registered Member
Join Date: Oct 2002
Location: Eastern N.C.
Posts: 50
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![]() I just built the motor and have had it running for 2 weeks. No times yet. Still getting some seat time. Stock cam with 1.7s right now. I asked about the heads before I tryed it and everyone said that there would be no problems. I didnt even check for clearence other than turning it over by hand to be sure. I was that convenced. Maybe with a bigger cam, I wouldve checked. My friend has his 306 with heads shaved .040 with the f cam and no problems so I dont know. Hes running low 8s in the 8th on street tires. No 1/4 mile times though.
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#10 | |
Get down.....
Join Date: Apr 2001
Location: Room 103
Posts: 2,095
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![]() Quote:
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Cobra brakes are on! Finally..... ------------------------------------------------ |
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#11 |
Registered Member
Join Date: Oct 2002
Location: Eastern N.C.
Posts: 50
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![]() Do you guys really feel its that close? Makes me want to measure it. I just dont really beleive its that close, I mean only .050 thousandts of an inch. Thats not much of nothing. I dont know the clearence on stock though. Intake bolts were close though. Any more and Id definatly say youd have to have that intake done also. If I ever have to pull the heads Ill check the clearence for sure. The machine shop was told to mill them as much as possible without having to worry about the intake and valve clearence, they came up with the .050. I was concerned at first but every one said that it wouldnt hurt anything. Guess they were right. But really, 50 thousandts of an inch isnt much
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#12 |
The Photoshop Guru
Join Date: Feb 2001
Location: Mecca, Indiana
Posts: 1,419
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![]() I took my heads to work and shaved .031" off of them. With 1.6 rockers and an F303 cam (.512" lift - 288 adv dur) and the stock forged pistons that come in a 90 Mustang 5.0 I had .095" piston to valve clearance. I've been told .100" is about the max you should go depending on how high you want to rev, but my throttle stuck wide open one night and the factory tach was stuch well past 8k and my valves still never hit. Also, it's not just how much lift you have, it's duration too.
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Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241 |
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#13 |
Registered Member
Join Date: Sep 2000
Location: rock hill,S.C. 29730
Posts: 420
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![]() Hey 88workcar, how does your car run with the cam and S.D.?
I drive mine on the street most often so I never thought I could change cams without mass air and still have good drivability? Your times are very impressive 1.55 60ft WOW! What does it weigh? How does it idle & drive around town?
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88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ |
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#14 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() Ski, it runs just fine. I have used a B, an E, and a wolverine 1087, all worked well. I drive mine daily, I pull my boat and 4 wheeler also. I got some strang looks at the boat ramp fri night
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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#15 | |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Quote:
I have never heard of anyone shaving more than .040" without also machining the intake. I would be very curious to know what your piston to valve clearance is. Take care, ~Chris
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#16 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() Well, now that I have put some thought into it. Cory has a stock bottom, we put AFR 165s on it, 1.94 / 1.60s and with a HR266 cam which is .544/.555 which is a quite larger than stock. It does just fine.
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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#17 |
Registered Member
Join Date: Nov 2002
Location: canada
Posts: 5
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![]() are 87 truck heads the same as mustang heads?
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#18 |
Registered Member
Join Date: Nov 2002
Location: canada
Posts: 5
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![]() are 87 truck heads the same as the 87 mustang heads or are they better or worse?
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#19 |
Registered Member
Join Date: Nov 2002
Posts: 68
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![]() i had my E7's ported and polished didn't flow much more i would say save up some more for some alumminum.
Before 157.5 Intake 115.5 Exhaust After 169.4 Intake 136.4 Exhaust But maybe i didn't get them ported fully? but oh well my heads are the only thing holding me back from some horsepower! |
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#20 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() Cody, done right it is 220 int / 175 exh
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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