Thread: hp estimate

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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

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.

Originally Posted by 86camaro

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 ?

With that much lift you would have to buy a set of killer valve springs.
Are you just messing with us???

Originally Posted by erik erikson

With that much lift you would have to buy a set of killer valve springs.
Are you just messing with us???

I never even thought about that.

Originally Posted by Matt167

I never even thought about that.

How many people do you know that have a .700 lift roller cam in a sbc street car??

Originally Posted by erik erikson

How many people do you know that have a .700 lift roller cam in a sbc street car??

nobody I know has a cam that big.

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 ?

Originally Posted by 86camaro

another guy is actually going to put a 434 with a big 8-71 blower in his S10 and will be making around 800hp

you don't do anything over 9:1 with any kind of boost,

Originally Posted by 86camaro

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 ?

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.
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.