arent those heads pretty well worked over with a cnc to get 411cfm?

where have you heard upwards of 500cfm?

 

Those make me think of the Brodix Canted Valve heads I ow so want. 450cfm is always a pretty thing.

 

Don't know if everyone read the article in January HotRod on page 76, but it kind of impressed me. Out-of-the-box AFR 227s with their competition CNC porting made 620hp @ 7000 on a 408ci. Although that was with a Super Victor/Dominator combo, but still not bad for those heads I thought. A vacuum pump and 114 octane raised that to 651hp.

So what hp has the custom porting jobs gotten from these heads? Cuz I know I've seen some really nice numbers from 227s with custom port work, but you gotta pay for that for sure.

As for 23 deg conversion, Dart dis-continued their 220 Race Series (CNC'd to 232cc-315/249cfm @ .700) for a new head they say will kill it. Due out for release this month, as it is still getting a CNC program run through it. Hmmm.

 

Perhaps because some of us are aware of how inappropriate a 275cc or 315cc intake runner and max flow in the 0.9" lift range are for a street engine...

 

Believe it or not these are out of the box. WOW! Sonny's Automotive is getting flow number's just a hair over 500cfm. There is alot of meat left on the runners out of the box.

 

Depending on how you look at it regarding the cfm amounts for street application the LS1 and C5R heads on most worked over combinations flow over 300+ cfm and are very streetable. If your cylinder heads are not flow cfm then just plan on loosing many races because those other cars out there are running high flowing heads that are winning.

I personally if having to do over again if I was building another SBC would never give a 23 degree head a look. You your self Jim should no this considering the 215 RR heads you have on your motor and the money involved in them. If your not careful you can get stomped into the ground by a 422ci LS1 headed Camaro that uses stock casting but only worked over. These high flowing steep valve angle heads still retain enought valocity to be streetable as compared to a hoged out 23 degree runner where by being a lazy bottom end runner.

I don't know about you but the car's in Michigan worth racing are nothing to play with and each year it seems the bar keeps getting raised when it comes to power so either move with the new technology or get ran over and left behind.

 

Jim did you get cc confused with cfm again?
Jim L. is refering to huge intake runners not huge flow.

 

Ya I read that wrong. But still yet a large cc runner on a big disp engine will show some crazy torq numbers.

I was watching a NA 632ci motor on the dyno produce some wild numbers like at 2400rpm's the motor was already making 980 ft lbs of torq and still climbing this was using a Big Chief ret port head that flowed 508 cfm on the intake and yes at .900 lift.

That's enought torq to ripe a stump out of the ground. LOL!!

 

Hey Ken,

What's the weather like down there? I was thinking about taking my car down to Orlando for some testing in a few months.

 

Like what kind of testing? It is always warm here, but actually this weekend there is a cold front so it looks to be a bitter cold of 55* here this weekend at night. Time to break out the sweaters and space heaters...
















Seriously.

 

Look at what you just said though. How many 600 cubic inch LT1's do you know of? How many 500 ci's for that matter? Because of our displacement limitations huge runner heads are completely pointless for the audience you are addressing here. You also have to realize that most of the guys here don't have 100% track ****** (race cars) so in the grand scheme of things they are going to want something they can enjoy more than a 1/4 mile at a time.

 

 

Track ****** is really funny! If that's what your calling me it's amusing that you have two cents to add ------! I hear more and more people conferting SB2 heads and 18 degree heads to LT1's and still street drive there car and that is because they WANT MORE POWER OUT OF THERE LT1! I will drive the **** out of my car on the street but by no means will anyone be able to say my car is a trailer queen and that is because it gets street driven.

Just about every really fast LT car I have seen now a days is running at least 227 runner. I my self have a 396 LT with 227 AFR's so don't tell me about street combinations. I'm looking for guy's like you to come and show me what time it is with your 170cc head equiped LT1 wagon just please bring your wallet to the race.

 

I don't remember personally calling you anything derogatory in my post. Most people know me to be very mild mannered and the pure ignorance you just displaced let's me know I don't even need to bother responding to your comment.

Your post however shows me where you are in this game. I don't play street racing games anymore cause 'normal adults' are suppose to think beyond the moment.

Good luck in your endeavours...with your attitude and your knowledge you will need it....

 

I don’t think Bobby was referring to your car as a trailer queen. How many of these cars running Little Chiefs do you see driven on the street...and not for one-time only cruise. I see big cube SBCs w/ 11*, 15*, 18* whatever heads too...they’re usually at the racetrack and are brought to the track in a box. I seem to remember the fastest LT1 out there running a puny LT4 casting too. Must be luck.

As for Bobby’s heads, they’re a tad larger than 170cc too.