Vettshop

1 point compression is worth approx 6% so .5 point is 3% 17hp +- a few not 50-75 sorry to point out the facts

Vettshop

Efi over a good carb equal ... Untuned carb maybe 20 on a great day..

Vettshop

Afr 220 comp 328 cfm @ .650 656hp approx your heads are maxed ... Time for air wolfs or some vfactors ...

tektrans

Nice #'s-should be good enough to sneak into the 10's. Did they cnc port the heads for you? My 406 made 531 with Dart 215's but they are unported. I'm pulling the motor to send them out to cnc port and get a new cam, springs etc.

tektrans

Are you still talking?

diehrd

584 / 567 Not bad .. Not what I had dreamed for .. I wanted 600 hp .. Not 599 but 600 or more.

A lot of this hobby is a vision we each have.. Like you sit in her and look around and think,, Man it is gonna rock in here with those new carpets !~!~! Now lets be logical its still the same car but to you or I who hobby cars that carpet made the whole car 1000% better. We take a pic , we show friends , admit it we are a bit off .

Is 584 bad ? NO .. Is it 600 , that carpet we had a vision of .. no ...

I could have gone BB or even LS .. But my car is a 1980 aside from the drive train it is true to its era which also was part of my vision / dream . I want to open the hoodand see a sbc in there .. Ask me why ? ? f u k if I know that is just how I see my car .. LMAO .. But I also want 600 hp .. or any HP with a six in front of it.

I am going to talk to the builder see what he has to say I have not even had a conversation with him and one question is why was the 6000 rpm the upper limit and not 6500 .. If that motor cant pull to 6500 then something is wrong ..

Vettshop

More cross section in heads will let you rpm higher. Afr are great heads but not with out limits which everyone is finding out with big cu in sbc's. Given the rule of approximately 2hp per cfm your engine is close to where it should be with the parts you selected. A thing to remember in cylinder heads is port speed which is great for throttle response and the low end but too much of anything is a bad thing. Too much air speed will act as a wall trying to make the turn where it needs to slow down

diehrd

Well 312 cfm should crack 600 , the Titan intake should also make that number easy.

10.5 should not be a wall to 600 ..

Bad windage , smaller headers and a rich a/f may all add up to explain the sub 600 number even operating temp could affect that pull result.. But part selection I just do not see as a wall to 600 ..

jb78L-82

Either way those are some impressive Gross numbers….you should be fairly pleased. I am impressed that some folks here reading back through this thread were real close with their guesses. It also appears that you should be able to hit 600 Gross HP with some tweaks.

I admire your desire to keep it "period" correct with your 80. I did the same with my 78 "L-82" 355 this past spring-it looks pretty much like the stock engine at first glance except the AFR heads. I am hoping for 425-450 Gross HP which should translate into 325-350 RWHP on a Mustang (suppose to be more accurate) not a dynojet dyno when I finally get it tested...

StraubTech

Actually Tonys engine is 14hp more at 6000 rpm and it 30ft/# more on average. The comment was they wished they had that flat of torque.

76strokervette

Pretty good numbers, but I'm curious why they stopped at 6000 rpm.What brand dyno was used?I know some are known to be stingier than others.What size primary tube header did they use?

diehrd

I am as well as it appeared to be peaking , it may be in fact as it climbed above 6k it started to drop off but even that would be important to see IMOP .

StraubTech

Paul your estimate based on heads and compression were spot on. Plugs showed it was a little rich so with some tuning it had a few more in it, but really a mute point since it will be an edit engine in the car.

diehrd

Head choices: http://www.airflowresearch.com/index.php?cPath=24_115


Question.. I chose not to go with 220cc SBC Competition Package and stayed with the 220cc SBC Race Ready because from nothing to 500 lift the race ready flow better , and from 500 to 600 the competition flows better ..

The way I see it , the cam has more time below max lift then at it and therefore these 2 sets of heads on a street motor would provide exceptionally close results.

Where am I going wrong with my assessment ?

StraubTech

The cam they use is also 11 degrees larger and is over .600" lift with a 1.5 ratio rocker. Damn those smaller cams!

double06

Very good torque which is what will move the car. Do not stretch too much (i.e. bigger cam - more compression thus negating pump gas optionality) to get to 600 just to loose drivability. Make sure you have a 3 inch dual exhaust for this thing.

tektrans

Vettshop

Heads are too close to being maxed out on the 427 class engines. 600 HP @ 6000 is all one can expect with the selection of parts.
High end engine build. Custom cam specd by one of the best and all the other do dads but the major power maker is left up to a off the shelf universal part...

KJL

1) Maybe he didn't want a crate engine?
2) Maybe he didn't want a big block?

Heck, if all he want was power, why not just sell the POS C3 and buy a C7? How about some constructive comments?

AirBusPilot

What did I win? I guessed 580hp. Remember, dyno's are tuning tools.