I'm building a 355, 530/542 solid lift cam, 1.6 roller rockers, ported 350 heads with 194 valves, 9-1 compression, edelbrock perfromer 750 carb, about how much hp will I be making ?
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I'm building a 355, 530/542 solid lift cam, 1.6 roller rockers, ported 350 heads with 194 valves, 9-1 compression, edelbrock perfromer 750 carb, about how much hp will I be making ?
what casting heads ?
What is the cam duration at .050??Quote:
Originally Posted by 86camaro
the duration at .050 is 248/252, I'm not sure on the casting number, I know that they have the bigger 194 valves, and the combustion chamber is 76cc giving me the 9-1 compression, I will be porting out the intake and exaust valves and intake and exhaust runners
You don't have enough compression to support a cam this size.Quote:
Originally Posted by 86camaro
Exactly right ....my 305 would outrun that motor if you put that cam in there.:LOL:Quote:
Originally Posted by erik erikson
yah that is way too much cam and way too little compression for a cam that big you would need about 10.5:1 or more. the lift is a big factor but the duration is very improtant. the longer the duration more fuel and air go into the motor, and with that low of compression you will lose power and also have very bad fuel consumption i would go with something like maybe 512 lift and 210 duration @.50 something around those numbers should help you produce a lot more power
not trying to be rude or anything but are you going with that cam just so it will sound good.....because there are other ways of getting that huge cam sound, with a small block you can go with a smaller cam and get that huge cam sound something with the abouve mentioned lift will sound great in that motor
Comp cams has the new pro stock sounding cams for a regular motor!:LOL: Really!!
ok, I just checked the catalog again, I found a 508/508 lift with 249/249 duration at .050, would this be a better cam ? what kind of hp would I make with that ?
For a comp. ratio of around 9 to 1 I would look at cams that have a duration at .050 of 230 or less.Quote:
Originally Posted by 86camaro
you know,if your dead set on that camshaft, you should just save your pennies and get a nice set AFR's or Trick flow heads. you can get 10.5:1-11.0:1 compression with aluminum and also they flow enough to support that type of camshaft. your combo right now, is totally out of whack. a camshaft is as only as good as the heads are. if aluminum heads is out of your price range, then use your iron heads and put a camshaft under 230 duration @.050 and go from there,and if i were you i would use every bit of information from us, because it will increase your chances of having successful engine. good luck on your build!
if want the big cam sound get a cam that works, it'll still give you a decent sound.... and just make it idle like crap by adjusting the idle screws totally wrong... it'll still run fine as soon as you leave the idle circuit.... but it will idle horribly and give that big cam sound
I think the engine will work fine with the cam I chose, I talked to the guys at the local racing parts shop, and I found out that there is a class of circle track racing that uses almost the exact same engine setup as mine, hobby stock class is limited to using production 76cc heads, 9-1 maximum compression, maximum 361 cubic inches, and he said the 508/508 lift cam I was looking at is the best one for that setup, it even noted that in the catalog that, and it's what most of the guys use, he said if I found some 305 heads with smaller combustion chambers that my compression would be upped to around 10.4-1 and the first cam I was looking at, the 530/542 lift would be the better choice, but if I stick witht he 350 76cc heads with the 9-1 compression, the 508/508 will be the better choice.
That might be true but now we are comparing apples to oranges.Quote:
Originally Posted by 86camaro
The circle track cars you are talking about run a lot more gear than you and their car is already moving and they weigh a lot less.
No,no and no ,are you building a circle track motor ?My 305 will outrun a nascar in the 1/4 mile .But the 305 would be about a 100 mph too slow on a nascar track.It comes down to application and matching the parts you have for intended use.The circle track guys HAVE to do that because of the rules,ask them if there were no rules would they build the same engine.It sounds like you are building a street engine and have no rules to make you build a oddball combo.When you get those mismatched parts together and actually make it run on the street,come on over here and I will show you what a properly matched 305 combo will do to those completely mismatched parts,unless you spring for a 5000 stall converter 5.88 gears in the rear and short tires and car weight of about 1500 pounds,which should put you at about 5500 rpm at 55 mph in high gear.With a top speed of about 70 mph right before it blows :LOL:
These guys are trying to help you keep from building a soggy combo and make the mistakes that have already been made by all of us,but it looks like you need to make your own mistakes and then you will know what all of us already know,which is that is a mismatched combo and will have problems.You will chase the tunning on that combo for weeks .I hope this frustration your about to assemble will not turn you off on hotrodding forever.
some of the durations on the other cams are way above 249, wouldn't the higher duration mean higher rpm power range, the 249 seems like it would have a pretty good low range power band
just a random question, do you guys think a 660/680 lift mechanical roller cam with 11-1 compression and around 260/270 ish duration at .050 on a 406 with dart 230cc heads, and 1.6 roller rockers which would up the lift to 704/725, would be a good street motor ?
11:1 on a street motor is pushing your luck with today's gas, yes it could be tuned to work, but, it's chancey.
With that much lift you would have to buy a set of killer valve springs.Quote:
Originally Posted by 86camaro
Are you just messing with us???
I never even thought about that.Quote:
Originally Posted by erik erikson
How many people do you know that have a .700 lift roller cam in a sbc street car??:whacked: :whacked:Quote:
Originally Posted by Matt167
nobody I know has a cam that big.Quote:
Originally Posted by erik erikson
no I'm not messing with you, I know of 3 people that have had that setup for their street cars, one of which put it in his 71 firebird and ran a 10.38 in the 1/4 all motor, another guy is actually going to put a 434 with a big 8-71 blower in his S10 and will be making around 800hp, and that's a street truck that has a 412 in it right now, anyway that was random and off topic, back to the durations, some of the durations in the series of cams I've been looking at are up to 260, 270, or 280, which would mean high end power, wouldn't the 249 give me more low end power ?
you don't do anything over 9:1 with any kind of boost,Quote:
Originally Posted by 86camaro
I live less than 1/2 an hour from Ames and I know just about every machinst that does performace work in Ames or Boone for that matter.Quote:
Originally Posted by 86camaro
If someone is telling you this they are full of BS.
I would love to know who built their engines.
Every Saturday night for the last 5 or more years I am the guy you see standing in or on an enclosed trailer with his arms crossed.
If it is being built in the area chances are I can tell who built it.
You don't have the compression for that big a cam.
If you want low end power look at something that has a duration of 220 at .050.