Thread: What to do next?? 406

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What are your cam specs. now?What is your stall speed?

Not sure on the cam but I would guess around a 500 lift I have a 2800 stall but getting around 2000

I would look at 3,500 stall to help launch the car.Yes it will build some heat so you would have to install a tranny cooler.If you are wanting to build a large amount of power I would not run a 400.I.M.O. around 550 h.p.the 400 blocks get more than a little un-stable.Yes, this will bother a few people that I said that.The early 350 block if preped right will handle around 575.

go to 200cc intake runner size heads for a 406. I would go with a set of 200cc dart pro 1's or Brodix race rite. 406 can use more cam too. Comp 280 magnum or bigger.

Originally posted by Skybu
go to 200cc intake runner size heads for a 406. I would go with a set of 200cc dart pro 1's or Brodix race rite. 406 can use more cam too. Comp 280 magnum or bigger.

He say's he has around .500 lift.A 200cc runner is way to big.I would stay at 180 cc at the largest.

I'd go with Brodix track 1s or afr 220,victor jr intake ,850 holley
and a cam with about 270 @.050 and .600" .
My combo a 3500lbs goes 10.98 @125 with no drivability problems other than the loose converter,but it is more of a weekend warrior,besides small heads just make too much lower
end to hook up on the street. There are quite a few heads that work good on your 406.

Originally posted by raceparts
I'd go with Brodix track 1s or afr 220,victor jr intake ,850 holley
and a cam with about 270 @.050 and .600" .
My combo a 3500lbs goes 10.98 @125 with no drivability problems other than the loose converter,but it is more of a weekend warrior,besides small heads just make too much lower
end to hook up on the street. There are quite a few heads that work good on your 406

If you can't hook your car up you work with the chassis.You don't put on heads with a larger port volume.Are you kidding me??

Everyone is entitled to their own preferences. It's up to You (the engine builder/owner) to decide what you want.

A relatively mild 406cid engine will more than handle the 200cc runners of a good flowing head. The small amount of torque loss given up at lower engine speeds will be made up by the convertor and cubic inches. If you want a performance 406, smaller heads (than 200cc) will choke it down after 5k RPM. You could go to AFR 190cc heads and it would be money well spent. Their ports are smaller but out flow the cheaper 200cc heads. If this is to be a performance engine and not a daily, sitting in traffic, commuting to work and grandma driving it to store engine. Build it with the fastest opening (aggressive) cam and MATCHED COMPONENTS of your preference. The more aggressive cam is easily recognized by the advertised duration compared to the .050 duration and lift. For example, a 280 advertised with 230 @ .050 and lift of .480 is less aggressive than a 280 advertised with 240 @ .050 and lift of .525. The more aggressive cams are harder on valve train components but do make more hp and torque. You have to use more spring pressure to control them and spring pressure wears out parts such as guides, tappets, and rocker arms much quicker. There are some good hydraulic roller cams that are much easier on parts. For a naturally aspirated engine, you would need the LSA (lobe separation angle) on about a 104*. That also kills street drivabilty and vacuum to operate brakes and such, although not to the point where it not drivable. You'll just have a lumpy idle and low vacuum.

On another note, the Weiand 177 super charger kit with a blower cam is very streetable as long as you have no more than 9.0:1 CR ratio and a BTM with timing retard. You wouldn't have to go near as much cam, have plenty vacuum, and performance will be outstanding. The 406 will handle it fine with MLS gaskets and 4-5 lbs boost max. The blower will make full boost around 2200-2500 RPM with WOT. With the blower setup, a good blower cam and free flowing exhaust is important. You don't need high lift although a little bit more spring pressure than standard is required. For more info, go to Holley's website and look up the instructions for part no. 6512-1 and read it. It explains the way the charger works and what is needed for dependable service.

There are a lot of ways to build HP but it always comes at a price. The more HP you build, the less dependable it becomes. A mild 406 can deliver good performance and reliability if built to do so. But if you're wanting more than what you got now, you must be prepared to give up how long it will last.

Originally posted by camaro_fever68
Everyone is entitled to their own preferences. It's up to You (the engine builder/owner) to decide what you want.

A relatively mild 406cid engine will more than handle the 200cc runners of a good flowing head. The small amount of torque loss given up at lower engine speeds will be made up by the convertor and cubic inches. If you want a performance 406, smaller heads (than 200cc) will choke it down after 5k RPM. You could go to AFR 190cc heads and it would be money well spent. Their ports are smaller but out flow the cheaper 200cc heads. If this is to be a performance engine and not a daily, sitting in traffic, commuting to work and grandma driving it to store engine. Build it with the fastest opening (aggressive) cam and MATCHED COMPONENTS of your preference. The more aggressive cam is easily recognized by the advertised duration compared to the .050 duration and lift. For example, a 280 advertised with 230 @ .050 and lift of .480 is less aggressive than a 280 advertised with 240 @ .050 and lift of .525. The more aggressive cams are harder on valve train components but do make more hp and torque. You have to use more spring pressure to control them and spring pressure wears out parts such as guides, tappets, and rocker arms much quicker. There are some good hydraulic roller cams that are much easier on parts. For a naturally aspirated engine, you would need the LSA (lobe separation angle) on about a 104*. That also kills street drivabilty and vacuum to operate brakes and such, although not to the point where it not drivable. You'll just have a lumpy idle and low vacuum.

On another note, the Weiand 177 super charger kit with a blower cam is very streetable as long as you have no more than 9.0:1 CR ratio and a BTM with timing retard. You wouldn't have to go near as much cam, have plenty vacuum, and performance will be outstanding. The 406 will handle it fine with MLS gaskets and 4-5 lbs boost max. The blower will make full boost around 2200-2500 RPM with WOT. With the blower setup, a good blower cam and free flowing exhaust is important. You don't need high lift although a little bit more spring pressure than standard is required. For more info, go to Holley's website and look up the instructions for part no. 6512-1 and read it. It explains the way the charger works and what is needed for dependable service.

There are a lot of ways to build HP but it always comes at a price. The more HP you build, the less dependable it becomes. A mild 406 can deliver good performance and reliability if built to do so. But if you're wanting more than what you got now, you must be prepared to give up how long it will last.

He states he has around .500 lift and he is getting 2,000 for a stall speed.If he runs a head with 200 cc port volume he will have no low speed throttle responce.It takes torque to get a car moving.

Originally posted by erik erikson
He states he has around .500 lift and he is getting 2,000 for a stall speed.If he runs a head with 200 cc port volume he will have no low speed throttle responce.It takes torque to get a car moving.

He also states he wants more. Less than 200cc want get it.

Originally posted by camaro_fever68
He also states he wants more. Less than 200cc want get it.

WHAT??

Originally posted by erik erikson
WHAT??

It sounds to me like he wants to build a hot engine. 200cc heads will be a must have. As long as he takes into account the problems that associate a hot engine, he can build what he wants to build. I run 215cc heads on a 10:1 383 with a stall speed of 2500 and 4.11 gears on a 30" tire. I pull both front wheels at the track on MT street ET's. I only turn my engine 6200 and I make plenty torque.

Originally posted by camaro_fever68
It sounds to me like he wants to build a hot engine. 200cc heads will be a must have. As long as he takes into account the problems that associate a hot engine, he can build what he wants to build. I run 215cc heads on a 10:1 383 with a stall speed of 2500 and 4.11 gears on a 30" tire. I pull both front wheels at the track on MT street ET's. I only turn my engine 6200 and I make plenty torque.

Next you are going to tell me it turn's 10.20's.Way to much head.The car would run quicker if it had smaller heads on it.

Originally posted by erik erikson
Next you are going to tell me it turn's 10.20's.Way to much head.The would run quicker if it had smaller heads on it.

Don't be a dick, I know what I got, I know what I build, and I know how they run.

Why do you go against dart and all other cylinder head manufactures on their recommendations?

Dart cleary states in their SBC Reference Guide:

180cc---Street Performance, maximum throttle response and torque; 327/350

200cc---Street Performance & and restricted oval track; 327/350

215cc---Serious Street Performance, Oval Track, Bracket Racing; 7000 RPM 383/400

So are you calling me a liar or what. My 383 runs low 11's.

Originally posted by camaro_fever68
Don't be a dick, I know what I got, I know what I build, and I know how they run.

Why do you go against dart and all other cylinder head manufactures on their recommendations?

Dart cleary states in their SBC Reference Guide:

180cc---Street Performance, maximum throttle response and torque; 327/350

200cc---Street Performance & and restricted oval track; 327/350

215cc---Serious Street Performance, Oval Track, Bracket Racing; 7000 RPM 383/400

So are you calling me a liar or what. My 383 runs low 11's.

Wow, name calling now.You state you only turn your engine to 6,200 I really don't think you should call that "Serious street.Low 11's is that in the 1/8 mile?