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Author
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Topic: I need your guys advice ASAP! Which cam?
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BLstangin
Gearhead Posts: 302
From: South Central MN
Registered: Apr 2002
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posted 06-09-2003 04:39 PM
   
My motor finally got down to the machine shop on friday! Now the tough question. The machine shop suggested a comp cam with a lift of .494, a 108 lsa, and 222 degrees of duration at .50 on the intake and 226 on the exhaust. Comp cams help line suggested a cam of .509 lift on the intake, and .512 on the exhaust with a 110 lsa and 224 degrees of duration at .50 on the intake and 230 on the exhaust. My motor will be run up to about 6200 rpm and the motor will have about 10:1 compression and a weiand stealth intake. Will I have any piston to valve clearance issues with either of these cams with flat top pistons? Which carb should I run on this combo, a 600 vs or a 750 vs? I need to decide so that my machinist can order the engine kit and get started on my motor. ------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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Dubz
Gearhead Posts: 378
From: Manitoba Canada
Registered: Oct 2002
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posted 06-09-2003 06:13 PM
i would say the bigger cam, and a 670 over a 600
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69 Sportsroof
Gearhead Posts: 1142
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 06-09-2003 06:17 PM
Are you using stock 302 heads? If so, I'd go with the smaller cam and the 600 will be plenty.
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BLstangin
Gearhead Posts: 302
From: South Central MN
Registered: Apr 2002
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posted 06-09-2003 06:47 PM
Forgot to mention I am using the DOOE-C 351w heads with the 1.84, and 1.54 valves, and they will be ported.------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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bluestreek
Gearhead Posts: 1202
From: Athens,GA
Registered: Jul 2001
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posted 06-09-2003 09:24 PM
The first cam sounds like a better match for your cars size and gears. The second one will have a little trouble getting started from a dead stop. If you don't mind a little valve noise from a solid lifter, a 270S will make more power than both of those cams and be more streetable too.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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mustangboy
Gearhead Posts: 617
From: Ont, Canada
Registered: Mar 2002
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posted 06-10-2003 12:03 AM
I think the bigger cam would be fine with a 4 speed and 3.50 gears.Might as well take advantage of the extra flow of your heads.As for the carb I've done some comparisons on my car with a 3310 750 VS and a 650 DP.The 650 was a little quicker but both carbs did identical "best" mph at the strip.Keep in mind neither carb was tuned to the max either but I prefer the VS on the street for an everyday driver and a Dp for a street/strip warrior.------------------
1968 mustang j-code sprint.13.69@101 306cu.in, stock ported heads,weiand exellerator,650 holley DP,hedman hedders,comp 292 Magnum cam,4-speed,8 inch 4.11 detroit locker http://mustangsandmore.50megs.com/MembersPics/mustangboy.html
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BLstangin
Gearhead Posts: 302
From: South Central MN
Registered: Apr 2002
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posted 06-10-2003 12:25 AM
How about a 270H. Which gears are you going by bluestreek, I will be putting in 3.50 gears shortly with a limited slip. The reason I ask which carb is because I have one of both of the ones I listed.------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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bluestreek
Gearhead Posts: 1202
From: Athens,GA
Registered: Jul 2001
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posted 06-10-2003 10:59 AM
I've been running 3.50 gears and 289/302's for years on all sorts cars. The bigger cam will work fine and give a little better top end, but you will give up some low and mid torque that you need for the '70 Mustang to get moving. I still like the cam that the machine shop chose for you. Also I forgot to mention that with either cam choice I would use the 600 VS for sure. The 750 is too hard to tune on a mild 302 and won't give any better performance. Start with new gaskets in the front with #70 jets, 6.5 PV, and a yellow spring for the secondaries. Then put it in a safe place. You can remove the sight plugs and fill the bowls through the vent tubes before running it on the new motor.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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BLstangin
Gearhead Posts: 302
From: South Central MN
Registered: Apr 2002
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posted 06-11-2003 12:42 AM
O.k. guys thanks for all of your advice. I have talked it over with my machine shop again, and he now feels that I should run the bigger cam, turns out he didn't see that one in the book, and I had to make a decision so I am going to go with the bigger cam, because my machinist feels that it should start to make power around 1800-2000 rpm and go until 6000-6200 rpm which is what I am looking for. Once again the lift is .509 on the intake, and .512 on the exhaust. Hey Alex, do you think I will have any piston to valve clearance issues with this cam and flat top hyper pistons? Thanks for all the advice guys I really appreciate it. ------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
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'69Stang
Gearhead Posts: 171
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-11-2003 02:58 PM
You won?t have any problems with piston to valve clearance, I ran a 230/235 duration cam with .510/.515 lift in a 302 with GT-40 iron heads and a 107 LSA. I think your cam is a little small, but it will be very street friendly.------------------
'69 Mustang Fastback, 351C, Holley 950 HP, New Parker Funnelweb intake, ported 4-v quench heads, 10.75:1, UD pulley, windage tray, Top Loader, 4.30 gears 9" rear
------------------------- 12.51 1/4 mile @ 115.89
60 foot time 2.008 (ouch)
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BLstangin
Gearhead Posts: 302
From: South Central MN
Registered: Apr 2002
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posted 06-11-2003 04:34 PM
That is just what I wanted to hear, thanks '69stang.  ------------------
1970 coupe restored with the help of my dad. 302 with 600 holley, aluminum intake, headers, pertonix ignitor 2 with matched coil, lakewood bellhousing, 4-speed toploader, and 2.79 open 8" rear. Soon to be 9" 3.50 trac-lok
1986 f-150, 5.0, factory towing package with original c-6 trans
IP: Logged |
'69Stang
Gearhead Posts: 171
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-12-2003 01:43 PM
BLstangin: I forgot to tell you regarding the piston to valve issue that my heads had been milled .040, also.
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