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Author
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Topic: Question For KV and/or MM
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64FalconF-16
Gearhead Posts: 196
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002
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posted 06-11-2003 11:49 AM
   
Kid,I want to upgrade my cam in the Falcon. It needs to still be streetable. I want a solid lift. What would you use for this application? I have: 351C Closed 4V.
Scorpion Rockers.
Makes about 11:1 compression. I do have valve relief.
Weiand X-Cellerator intake.
800 Holley DP
3500 Stall on a C-4 w/ 4.11 Gears. It'll be a local weekend driver with alot of time at the track in N0-E competition.
Thanks,
Rick Austin
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70coupe
Gearhead Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 06-11-2003 01:40 PM
Bye,bye x-cellerator! Get a torker or even better Holley strip dominator. I have a set up very similar to yours and have run a best of 11.83 with a crane solid .570/.590 with 246/256 duration and 108 lobe center. The part number is 521211 I think! My car weighs just over 3300lbs with me in it. I've had smaller cams but nothing larger so I cant help you there.
Good luck.I run a C4 with a 4700 stall launching at 4000 on the two step and 4:11 gears. ------------------
351c 4v clsd heads
60'1.580
1/8 [email protected]
1/4 [email protected] [This message has been edited by 70coupe (edited 06-11-2003).]
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64FalconF-16
Gearhead Posts: 196
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002
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posted 06-11-2003 02:18 PM
70 coupe: Would you drive your rig on street with that cam?
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-11-2003 04:28 PM
I used to run a solid Lunati on the street several years ago that was 235/245 @ .050, I think. Sadly, I don't think they still offer it anymore. It worked real good too.I would try and find a cam with duration numbers in that area. I'm sure someone grinds one close to it. Comp may, I haven't looked lately. As for streetability. The last cam I had that was in a street motor (it never saw the street due to a broken race motor) was 255/265 @ .050.  But I also was going to use a 4500 rpm convertor, so it would have worked "decent". 
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70coupe
Gearhead Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 06-11-2003 04:44 PM
It would be fine for the street. My power brakes even work with it! It has a nice sound to it as well. Mine idles at 800-900rpm. Thats just my choice, I know you will get many opinions. The cam I had before this was a Crane .554/.577 with 236/246 duration and it didnt work near as well. I think the clevelands like a lot of duration.
Good luck.------------------
351c 4v clsd heads
60'1.580
1/8 [email protected]
1/4 [email protected]
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-11-2003 06:13 PM
I was doing a little looking around, and with your compression, you can probably get away with running a little more duration than that first cam I used. If your motor was mine, my first coice would be to use Comp cam grind 284B-8. Second choice would be, the last cam I had in my street car, grind 294B-6. The first one is 246/256 @ .050, .564/.589 lift with a 108 LSA.
The second one is 256/266 @ .050, .589/.615 lift with a 106 LSA. Either would work well, with the street off idlepower advantage probably going to the first one. But the second one will make more power upstairs where the clevelands like it.
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70coupe
Gearhead Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 06-11-2003 07:42 PM
I'll keep that second one in mind as well!
Sounds like a good upgrade from the one I'm currently using.
Maybe next year!
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-11-2003 08:16 PM
I ran that second cam a couple of years back. I had it in a motor for my street car. It was pretty mild; umported 2v heads with screw in studs, 10.4-1 compression, an old single plane Offy intake, and that camshaft. It never made street duty, instead a problem with my racemotor forced it into the racecar. On gas, it ran 11.20's, on alchy, it ran consistant low 10.80's with a best of 10.52. I won a lot of money with that combo that year.  It worked so well I kept that cam and lifters. I will find some use for it again someday.
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64FalconF-16
Gearhead Posts: 196
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002
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posted 06-12-2003 09:25 AM
Kid,On that second choice cam.... What pistons did you run and how was the valve/piston clearance? My heads are shaved /010. So I have to be concerned there.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-12-2003 10:51 AM
I ran the domed pistons for closed chamber heads. The heads I used were shaved .025. Truthfully, the only time I have ever ran into valve to piston clearance issues is with the last couple of motors I have built. The two constants between them is the camshaft (solid roller 264/272 @ .050 with .650/.650 lift) and the heads that have been milled .050. I really think the milled heads is my problem. Both motors used domed pistons, one was with old TRWs, this one has Arias pistons in it. Both had about the same amount of clearance, (not enough). With your heads only being milled .010, and flat top pistons, unless the pistons are out of the hole a long ways, I highly doubt you will have any problems. I would still do a rough check, but I bet it would be fine.
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