406-409 ci thread
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
406-409 ci thread
If you have a 406 ci engine ;please post your Dyno numbers,, I should be getting my dyno info in a day or two, so I will post mine when I have them,,, I think it will be interesting to get a bunch of 406-ci info in one thread,, post your complete combo if you like
CI = 406 ci
Hyd or Solid Roller cam =
Intake Manifold =
Compression Ratio =
NA = yes or no
Type of Dyno =
HP@RPM =
TQ@RPM=
Thanks Chris
CI = 406 ci
Hyd or Solid Roller cam =
Intake Manifold =
Compression Ratio =
NA = yes or no
Type of Dyno =
HP@RPM =
TQ@RPM=
Thanks Chris
Last edited by LD85; Oct 2, 2010 at 09:16 PM.
Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
If you have a 406 ci engine ;please post your Dyno numbers,, I should be getting my dyno info in a day or two, so I will post mine when I have them,,, I think it will be interesting to get a bunch of 406-ci info in one thread,, post your complete combo if you like
CI = 406 ci
Hyd or Solid Roller cam =
Intake Manifold =
Compression Ratio =
NA = yes or no
Type of Dyno =
HP@RPM =
TQ@RPM=
Thanks Chris
CI = 406 ci
Hyd or Solid Roller cam =
Intake Manifold =
Compression Ratio =
NA = yes or no
Type of Dyno =
HP@RPM =
TQ@RPM=
Thanks Chris
There are a few 406's on here but if memory serves Brian has one of the strongest running one's.......
Typically these motors aren't dyno queens.
BTW. Who is Chris?
Race Director
Joined: Nov 2003
Posts: 12,221
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
You could look thru and pull 400+ ci numbers from the sticky at the top of this forum....
http://forums.corvetteforum.com/c4-t...ip-thread.html
http://forums.corvetteforum.com/c4-t...ip-thread.html
Team Owner
Joined: Aug 2005
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From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
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St. Jude Donor '09 thru '20
I got a feeling this thread is going to bring smiles to my face...I CANT WAIT 
Race Director
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
My 406 hasn't been on a dyno. 12.4cr, Crane 230/240 hydraulic roller, 1.6 intake, 1.5 exhaust. 625 lift, SuperRam, Holley 20 degree heads. The car traps 126, about the same as my 08Z06 which has been dynoed at 487 rwhp on a Dynopak.
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
mine with 12psi made 640whp on a mustang dyno... 401". Not exactly what your looking for but here is my buddys car
406 Miniram with ported AFR 195 old style heads, now around 210cc with 306cfm I believe.
Box stock miniram
Ultradyne solid roller low 250's/260's intake/exhaust duration at .050. Mid .600's lift
About mid 10's to 1 compression.
T56 transmission. 3.73 12 bolt rear end.
Chassis dyno.
468whp with lean 13.2 air fuel ratio at 6100 rpm holding out a ways.... miniram is holding it back badly. Added abit more fuel, car went 10.6's at 130 on motor at the track so its got some *****.
406 Miniram with ported AFR 195 old style heads, now around 210cc with 306cfm I believe.
Box stock miniram
Ultradyne solid roller low 250's/260's intake/exhaust duration at .050. Mid .600's lift
About mid 10's to 1 compression.
T56 transmission. 3.73 12 bolt rear end.
Chassis dyno.
468whp with lean 13.2 air fuel ratio at 6100 rpm holding out a ways.... miniram is holding it back badly. Added abit more fuel, car went 10.6's at 130 on motor at the track so its got some *****.
Burning Brakes
Joined: May 2010
Posts: 900
Likes: 3
From: Cary illinois
mine with 12psi made 640whp on a mustang dyno... 401". Not exactly what your looking for but here is my buddys car
406 Miniram with ported AFR 195 old style heads, now around 210cc with 306cfm I believe.
Box stock miniram
Ultradyne solid roller low 250's/260's intake/exhaust duration at .050. Mid .600's lift
About mid 10's to 1 compression.
T56 transmission. 3.73 12 bolt rear end.
Chassis dyno.
468whp with lean 13.2 air fuel ratio at 6100 rpm holding out a ways.... miniram is holding it back badly. Added abit more fuel, car went 10.6's at 130 on motor at the track so its got some *****.
406 Miniram with ported AFR 195 old style heads, now around 210cc with 306cfm I believe.
Box stock miniram
Ultradyne solid roller low 250's/260's intake/exhaust duration at .050. Mid .600's lift
About mid 10's to 1 compression.
T56 transmission. 3.73 12 bolt rear end.
Chassis dyno.
468whp with lean 13.2 air fuel ratio at 6100 rpm holding out a ways.... miniram is holding it back badly. Added abit more fuel, car went 10.6's at 130 on motor at the track so its got some *****.
Im interested in this thread .I was looking at building a 406 . Not sure what to put together . Car will be used on road courses , 3:73
Want something that will live , looking for at least 400 rwhp . Afraid to use a stock block , thoughts ???
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Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
Miniram doesnt flow enough for the heads so it needs ported out alot or he may go to a single plane EFI setup thats ported. It ran 127mph with 468whp but since he added fuel to richen it up, it traps 130 now so its got to be up near 490-500whp. He's using a production 400 block and its been living for YEARS
Le Mans Master
Joined: May 2004
Posts: 5,385
Likes: 534
I was on a 406 kick for the longest. Wanted one for years. Reading about guys getting lucky finding them in local junkyards and making a nice street engine made me jealous. Hard to find a decent 400 block.
I'd be interested to hear how you guys came across your blocks, or if you just bought them that way.
I'd be interested to hear how you guys came across your blocks, or if you just bought them that way.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Best thing to do is just get a Dart, yes more money but totally worth it, lots of improvements over a Gm block. Youd have to see them side by side to appreciate the differences.
Wish Id have built a bit bigger.
Wish Id have built a bit bigger.
Le Mans Master
Joined: May 2004
Posts: 5,385
Likes: 534
What other improvements were made?
Thread Starter
Race Director
Joined: Feb 1999
Posts: 12,772
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From: Indianapolis IN
They are still around, mostly 2-bolt mains, which are fine, an un-bored 509 casting is becoming harder to find, mine is a 2-bolt.
The nice thing is that you can build a mild 406 and get very streetable engine, that was my goal, more pep than average, but I did not want to go ***** to the wall.
If I go BTTW, I will go big block NA and go for big numbers, bit for now,, anything mid 4XXHP and TQ is very good IMO
The nice thing is that you can build a mild 406 and get very streetable engine, that was my goal, more pep than average, but I did not want to go ***** to the wall.
If I go BTTW, I will go big block NA and go for big numbers, bit for now,, anything mid 4XXHP and TQ is very good IMO
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
I was on a 406 kick for the longest. Wanted one for years. Reading about guys getting lucky finding them in local junkyards and making a nice street engine made me jealous. Hard to find a decent 400 block.
I'd be interested to hear how you guys came across your blocks, or if you just bought them that way.
I'd be interested to hear how you guys came across your blocks, or if you just bought them that way.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
2K sounds like alot, but it is easy to put $1300 in a GM block.
Team Owner
Joined: Nov 1999
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From: Former NCM Drag Racing coordinator, National director Corvette Challenge Spring Hill, Tennessee: Whiting, New Jersey
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Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Back when I was looking a cherry 400 block was going from 2-400. By the time you did machining coulda already been in a Dart block which is worlds stronger, large cooling jackets etc.
picked up a Dart little M I did for someone else here for 1400
picked up a Dart little M I did for someone else here for 1400
Last edited by cv67; Oct 3, 2010 at 10:51 PM.
Le Mans Master
Joined: May 2004
Posts: 5,385
Likes: 534
Nice info from everyone. Hard to imagine how much there is to know about an engine before you put it together yourself. You guys make it look easy.
I've got a couple of engine books but I read stuff on this forum that the books NEVER touch and it's really surprising how much I read on here that seems so vital to a good engine.
I've got a couple of engine books but I read stuff on this forum that the books NEVER touch and it's really surprising how much I read on here that seems so vital to a good engine.
Burning Brakes
Joined: Jul 2006
Posts: 1,080
Likes: 2
From: Pittsburgh PA
I got my SHP 400 block for 1795 fully machined/blueprinted from CNC Blocks Northeast. Summit sells them for like 1500 and describes them as fully machined but they need clean up as they come from DART. They dont all check out at the machine shop.
Its nice because its modeled after a 87-99 roller block with the roller cam setup using the OEM dogbones/lifters/retaining plate/spider/etc. No retrofitting necessary. It has 4 bolt splayed main caps. Thicker in all the right areas compared to OEM. Does not require steam holes drilled in your heads either!
Downside is its a 80-85 style 2 piece rear main so there are only a few oil pans that fit. Canton sells a few. passenger side dipstick.
If your building a nice high hp 400+ inch motor, I'd run the SHP block. The other Dart blocks like Little M and such are for even more hp builds and cubic inches.
Its nice because its modeled after a 87-99 roller block with the roller cam setup using the OEM dogbones/lifters/retaining plate/spider/etc. No retrofitting necessary. It has 4 bolt splayed main caps. Thicker in all the right areas compared to OEM. Does not require steam holes drilled in your heads either!
Downside is its a 80-85 style 2 piece rear main so there are only a few oil pans that fit. Canton sells a few. passenger side dipstick.
If your building a nice high hp 400+ inch motor, I'd run the SHP block. The other Dart blocks like Little M and such are for even more hp builds and cubic inches.