Author Topic: Camshaft ideas  (Read 851 times)

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fastf67

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Camshaft ideas
« on: September 16, 2025, 11:41:36 PM »
Building a inexpensive rat rod out of a 67 econoline pickup using up some old parts I have. Truck was 2400lbs from the factory. I'm installing a 351 clevor and moved it back 14" with a top loader. Engine = 4.00 scat crank, 6.200 rods with dss pistons, should be about 10.6 to 1. Factory Cleveland quench heads with a little bowl intake side and as much smoothing i could to straighten  on the exhaust. 2.190/1.71 valves, Wieand boss tunnel ram using PMS adaptors, 2 650 dp brawler carbs, I have many different gear sets up to 5.14 for the 9" and looking at a Crane# F-248-3334-2-8 cam= .533in .555ex but will be running 1.8 rockers to make it .599in and 624ex. Adv duration 310in 320ex, @.050 .248in .258ex on a 108 lc timing events are open 21*in and 62*ex close is 47*in and 16*ex. I used to run this cam in a bogus boss 302 in the late seventies and it was ok. Really just looking for something on a shelf as it's probably not worth bothering people like Brent Lykins or anybody.

blykins

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Re: Camshaft ideas
« Reply #1 on: September 17, 2025, 05:04:12 AM »
You can bother me. 

If you have it, use it, but here's my thoughts:

1.  Lazy lobes
2.  Not enough duration to warrant anywhere near a 5.14 gear with a 408ci engine.  On a solid flat tappet, you don't see the duration at the valve that you would with a hydraulic cam, because you're moving through lash first. 
3.  I certainly would not run a 1.8 rocker with it.  Cams need to be designed to work with steep rocker ratios, otherwise it can put the valvetrain through a lot of distress.
4.  Ton of advertised overlap.  A lot of .050" overlap too, not efficient. 
Brent Lykins
Lykins Motorsports
Custom FE Street, Drag Race, Road Race, and Pulling Truck Engines
Custom Roller & Flat Tappet Camshafts
www.lykinsmotorsports.com
brent@lykinsmotorsports.com
www.customfordcams.com
502-759-1431
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fastf67

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Re: Camshaft ideas
« Reply #2 on: October 06, 2025, 12:26:58 PM »
Have to send out a (kudos) to Brent Lykins Motorsports, Comp Cams and Fed Ex. I called Brent Monday 9:30am September 29th and said lets go with your custom cam design and there's no rush. Saturday morning October 4th at 9am it arrived on the front porch. Cam was called in, Ground, boxed up and Fed Ex ground mail and on my porch in Missouri in under 5 days. WOW..... That is service at the highest level. Thank you.