1972BBRR4

Alright im young and have been working on cars for years with my dad. but i have a 440 build up i want to start soon. and here it is.

mid 60s 440 bottom end. .060 flat top pistons stock bottom end new bolts
0 deck height, 516 fully done up heads ported polished big valves ect. hopefully 11.5 CR hoping for. running on 93 octane a little high CR i know but i was thinking a roller cam- Duration at .050 211/219 .507/.515 1400-5500 rpm. itll have an 850 min. performer intake. hoping for over 500 hp. i want a mean lopey idle and a mean sound i was also thinking about this one lunati .050 234/242 .513/.533 2200-6400. i was wondering how the roller will sound compared. the roller is a better rpm range. the car will be in the 5500 rpm range a lot. all street car. 4 speed 3.91 rear. flowmasters just a general build let me know what you guys think.

67 GTX

welcome to the forum
unless you are running aluminum heads, 11.5 compression is way too high
you'll probably have pinging problems with that

1972BBRR4

the only reason i thought i heard 11.5 on aluminum heads on 93 oct. would ping. 11.5 is at the maximum on pump gas with cast heads. but what about the rest of the build? thanks by the way!

Sgt. Veteran

All sounds good but I don't think your going to be happy with 11.5 on 93 pump gas, thats a lot of squeeze for 93 oct. I think it will be pinging its head off non-stop but I could be wrong, the last motor I built with 11.0 compression would not run on less then 104 oct. with steele heads .... roller cams are ok and work great but the old hyd. is my prefrence, can't remember but read something about limited lobe profile or something like that with rollers, prob. wrong but so was Henry Ford lol

1972BBRR4

haha alright thanks a lot. still not sure about the cam. but not sure yet

Sgt. Veteran

Hey man whatever you do in the end it's going to be tuff as nails no doubt, even motors with 9.5 can make tons of hp it is all is the cam and what lift / duration that will sets the characteristics of how it runs, the one part that does effect just about everything in a running motor, good luck man, Jake

blue 68 gts

My motor pings with 9.5:1 compression on iron heads. Just a bit, but none the less still does. Octane booster fixes that.

That came seems like it'd be a good size, but you need to find one thatll fit with the combo.

I have basically the same motor, but mine has dome pistons, not flat top. I have a Lunati voodoo cam 513/274 and it runs very well.


With flat top pistons I don't think you'll be hitting 11.5:1, I have a 72 440, stock bottom end, dome pistons, 516 heads, ported, valves, ect.

1972BBRR4

but with that combo the roller cam would be better. 5500 rpm will be roughly my highest rpm. performer intake goes to 5500. and with the 516 heads they have a 72 cc combustion chambers with 0 deck height and flat tops ill be right around that 11.5:1. So which cam. maybe ill drop the compression. but id like a mean lopey or chopey idle. that performs well in my rpm range thanks a lot everyone!

67 GTX

11.5 on cast heads is way too high

67 GTX

under what conditions?

1972BBRR4

So 67 what about adjusting the timing? and 94 sunocco. and if its still a no. could you suggest some changes to my build? how do those cams sound? im sorry to fight you on the 11.5 but obviously each engine is different. i have heard of some with 11.5:1 on pump gas. i guess taking a risk. so what should i need for 11.5 or lower it. thanks guys

67 GTX

if you have aluminum heads, 11.5 will work on pump gas
if you have cast heads, you will need to retard the timing to get the car to run without major pinging, then the car won't run right

for the cam, what do you mean by the car will be in the 5500 rpm range a lot? You said a street car.
For a street car, look for more bottom end torque then high end power.

Archer

74 -

With all due respect, "sounds" like you're thinking more about how the car sounds than it's drive-ability. It's cool for a race car, but if you plan on doing any cruising with the car, the "mean-lopey" idle gets old really fast, for me anyway.

Guess the first thing you have to really think about is how much time you're going to spend at the track vs. on the street.

A cam in the 2500 - 5500 range is pretty streetable (but most BBs aren't going to like 5K+ rpm ranges for any lenght of time - most of your driving should in the 2K range), providing the rest of the engine, trany and rear works in the same power band. A roller cam is a better bet, not because of power production or "sound" but because it will last longer with todays' zincless oils. (Sure there are things you can add, but IMHO, a roller cam is extra insurance.)

As far as compression, I'm running a measured 10:1 and an older style hydrolic cam and haven't had any problems, >11:1 seems a little high for a street car.

Archer

1972BBRR4

67- the 5500 rpm is more like the car is a street car. but that doesnt at all mean it wont see 5500. the car will be a fun toy all for fun. to drive the car hard. i want a decent band all the way up to 5500. so thats why im thinking the roller 1400 to 5500 rpm range.
Archer- the sound of the car is very important. i have a 468 BBC with a big lopey cam and i dont at all mind cruising to that noise=] The car will be a hard run street car. im not babying this car at 3500 rpm max this thing will be up and down. it wont stay at 5500 rpm for any length of time just brough up in a couple gears a couple times. CR im rethinking but maybe Aluminum heads?