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Old 04-14-2004, 10:13 AM
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Lightbulb Okay is this worth it?

I just got a camshaft from a friend of mine that sold his car before he could use it. He traded me it for a Ford carb. Its a Lunati and its got the #4 and the #7 backwards. I have been told this is a secret that nascar was doing for some time. What changes would I have to make to get this to work and is it worth it the specs are 232/ 236 at .50 duration and 510 by 520 lift with a 110 lobe sep. Would I change the spark plug wires to be the #4 on the #7 and vice a versa???

Ow and the cam i am using now is a comp 280 H magnum 230/230 at 50 duration and 512 by 512 with my 1.6 rockers.

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Old 04-14-2004, 06:24 PM
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nobody got any imput here on this ???
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Old 04-14-2004, 09:49 PM
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Swapping the 4&7 plug wires is the only thing required to make it work. From what I have heard, the biggest gain is a smoother running (less vibration) engine.
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Old 04-15-2004, 09:27 AM
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Thanks boss appreciate it.
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Old 04-15-2004, 10:18 AM
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What engines is this trick (switch the 4&7 plug wires) good for? What needs to be on the engine (the kinky cam, or factory-style cam), and does a special crank need to be used (to put the pistons in the correct spot so you're not firing the plug off at the end of the intake stroke)?
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Old 04-15-2004, 12:59 PM
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All you have to do is buy a 4/7 swap cam and swith the 4 and 7 wires. I have a friend that just built a 383 with a custom grind 4/7 swap cam from comp cams.

Adam
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Old 04-15-2004, 01:47 PM
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I'd be interested to see some dyno comparisons between 4/7 swap cams and standards. How does it affect the powerband?
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Old 04-15-2004, 02:31 PM
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Okay the test is scqeduled and i will use the same engine for both tests. One with the lunati 7/4 cam and then a similar cam without . I think I saw a lunati grind with the same duration, lobe sep, and lift. I'll do it this weekend.
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Old 05-06-2004, 09:48 AM
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this works for ALL v8 engines, right?
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Old 05-06-2004, 09:56 AM
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Quote:
Originally posted by ChevelleSS_LS6
this works for ALL v8 engines, right?
And a few V6's

hahah i couldnt help myself.
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Old 05-06-2004, 01:00 PM
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Same thing on chevy's 5 and 7. Provides a tick better fuel distribution. The two cylinders aren't fighting each for air.
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Old 05-06-2004, 05:19 PM
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Quote:
Originally posted by bad327
Okay the test is scqeduled and i will use the same engine for both tests. One with the lunati 7/4 cam and then a similar cam without . I think I saw a lunati grind with the same duration, lobe sep, and lift. I'll do it this weekend.
Keep us posted on this one. I've heard everything from 5 to 25 horsepower with the biggest plus being a smoother engine.
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