cam and intake selection

[71chally416]

They work if you want the added hassle and expense. I'd remove the power brakes and just use manual discs. They work fine.

[360 'CUDA]

Manual discs came stock on my '74 and I love em.  There is more pedal effort but I feel like I have alot more control then squishy power brakes that lock up very easy

[black71]

great thanks for the info guys!.....thought i'd ask another question here instead of starting another thread...please excuse my ignorance as i am relatively new to the hobby (i'm 19 been a car nut since age 11 but never had a running car to work on)....that being said, how do i identify different models of holley carbs....as previously suggested i'm going to use an 850cfm, money is pretty tight and i've seen the ported bodys that you can order through summitt and jegs. you guys ever used one? i have a couple holleys that i need to look at and see if i could convert them, budget is too tight for a new carb right now... i've heard vacuum secondaries are better than mechanicals..Why? i have so many questions when it comes to motors... cams, carbs, and on and on....where did you guys learn how to pick and choose whats best? thanks for all your guys' help...i'd be up a creek without it!

[Chryco Psycho]

the list # stamped into the choke on the Holley carbs will identify the CFM
, You can replace the bodys with the Profom body & the metering plates can be swapped for Proform billet pieces as well both will increase the performance of the older style Holley carbs

[black71]

thanks CP i'll look into it! ...you also suggested Engle or Lunati but i didn't see where you suggested a lift/dur...any suggestions there or would you just recommend calling them?

[Chryco Psycho]

depends what you want , Hyd solid or roller cam , what other pieces & what powerband do you want ?

[black71]

right now all i can afford is a hydraulic...and as for powerband this is going to be a street strip motor, of which i'd like to run lower 12's  and maybe spray once just to say i've ran 11's

[Chryco Psycho]

www.englecams.com
 I would look at something in the k56/k58 split duration grind 110* CL with headers , or 112* with manifolds
using approx 2000 stall converter , this will make more power than the 484 Mopar & will offer better drivability & vacuum as well
 You can use a similar Lunati Voodoo grind.
 I would use a Holley Street Dom intake or the Eddy RPM
 if you are buying adjustable rockers anyway you may want to look at a solid grind cam as the cost will be similar but you will have better performance

[black71]

awesome thanks! and as for solid grinds, what am i lookin at for maintenance?

[Chryco Psycho]

not much , adjust the valves 3-4 times in the first 500 miles & maybe once / year after that

[black71]

hmmm that dont sound bad.....they hard to adjust? my uncle could show me how, is it soemthin i could pick up pretty easy? sorry to be a pain

[Chryco Psycho]

it is not difficult

[black71]

thanks a million cp....one more question, what determines the CFM of a carb?

[black71]

...and with the proform carb bodies and baseplates, does this retain the carbs  original CFM? i checked the numbers of the holley i have, its just a 4160 600 CFM  ......are proform barbs good carbs? and when looking do i want vacuum or mechanical secondaries?   

[71chally416]

You find out working on the engine dyno that carb CFM ratings are always more than reality. Best to err on the side of big. I wouldn't recommend piecing a carb together with parts or mechanical cams  for someone with limited experience. That's a recipe to be on here 50 times with questions when you have problems. There are easier ways.

Back in the 70's the road tests for the 440-6 E bodies were in the 105 mph range. Considering the skinny bias tires of the day you can safely add a few MPH for just modern tires and a few more for good headers and exhaust. Any dyno test you see today will show a good modern Intake and 4bbl will out-perform the old 6-bbl so already you're close to the goal of 110-115mph to do low 12's. Add a good hydraulic cam, the hopefully better flowing heads that you already have, and a properly setup chassis to hook the tires up and you're there. Many different ways to get there, but it's the combination of everything that matters. My