Cam Shaft Recommendation? - FFCars.com : Factory Five Racing Discussion Forum

 
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post #1 of 4 (permalink) Old 05-17-2017, 08:16 PM Thread Starter
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Cam Shaft Recommendation?

I’m in the process of planning a cam swap and would appreciate some experienced opinions on general specifications to focus on, and/or any recommendations on a specific cam if you’ve had experience with a similar motor build. Basics of the motor are:

• 395 based off a 351w block
• Dart Pro1 Heads 195cc
• Roller lifters
• Comp Cam rockers
• Hardened pushrods
• Forged Pistons
• Edelbrock Airgap intake
• Holley 770 street Avenger

The car has 5000 miles on the clock and is exclusively used as a street car / Autox’r. The only thing I know about the cam currently in the motor is that it is a Crower custom grind. Unfortunately, I didn’t get the data card from the builder at the time, and he is no longer in business and has moved to the other side of the country. The motor idles around 700 rpm but it's a rough idle with a lot of engine movement, and it’s pulling only 10-12” of vacuum. Above 2500 rpm the thing pulls like a freight train and is putting out 410 rwhp. The rough idle however has caused reoccurring header fractures and side-pipe rattles despite a flexible side-pipe hanger system.

I know cam choice is a compromise, but I want something that’s going to have a tamer idle while maintaining as much of the performance as possible. I plan to contact a couple of cam manufacturers to see what they recommend, but I’d appreciate any input from others familiar with this type of engine build on what you’ve seen work well. What particular specs should I be looking for? Any recommendations on a specific cam from those that have a similar engine set-up?

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post #2 of 4 (permalink) Old 05-17-2017, 09:09 PM
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I have a Comp Cams XE262X-10 or 35-238-3 (both #s appear on the label) in my 408W. It is too mild. To be fair, I asked them for a cam that I could drive at 1400 in 5th. Also to be fair, I am still running my QF SS650AN carb and could probably use a 750. But I think I am leaving some power on the table.


FFR 5353K, 408W, TKO 500, 2015 IRS w/ 315 gear, Breeze QA1 DA coilovers front and rear, APE hardtop, Forte front swaybar
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post #3 of 4 (permalink) Old 05-17-2017, 10:43 PM
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I run a 393 Cleveland with a Lunati VooDoo 0.666"/0.675", 273/279 solid roller. Pretty "lumpy" idle, but revs like a banshee! LSA is 112. You may wish to stick with your current lift/duration, but widen the LSA to 114 or even 118 deg (less overlap) to tame the idle a bit. Overall performance will be close to the same as with your current grind.

FFR MK4 #8317, 393 Cleveland, Lunati VooDoo solid roller, CHI 3V heads and intake, TKO 600, Std roadster seats, 8.8 3.55 diff, 17" Halibrand replica wheels, Ford "Magnetic Metallic", silver ghost stripe.
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post #4 of 4 (permalink) Old 05-18-2017, 11:56 AM
MJN
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10" to 12" of vacuum isn't bad. Try raising your idle speed 50 to 100 rpm and resetting the idle mixture screws evenly that should help.

Mike....
FFR2100 - 331 With Kenne Bell 1500 Blower. T5 and 8.8 w\' 3.08\'s. Best ET 11.71 @ 117
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