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462 heads on 383ci

  
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462 heads on 383ci

 
martien martien
New User | Posts: 1 | Joined: 01/05
Posted: 01/18/05
03:58 PM

hi sorry for my poor english (dutch)


i have 383ci chevy 10:1 compression (STILL asembling)


edelbrock 750 carb, pro flow cleaner edelbrock


edelbrock rpm manifold


headers rollertip rockers


cam 230 in 230 ex 480 lift both


under drive pulleys, ram air scoop


462 fully ported heads valves 1.94/1.5 will de heads do a good job ????


and what hp will it get


 


thanks martien


 


 


 


 

 

EthelkilledFred-#002 EthelkilledFred-#002
Enthusiast | Posts: 362 | Joined: 02/04
Posted: 01/19/05
04:17 AM

I have used these heads on 383 and they work good, I used a bigger cam. Comp Cam 305 Magnum-.525/.525 lift, 253/253 dur, 110 cl 


This is one guys opinion off the net-


SBC Cylinder Heads

Contributed by Bert (racerguy) CT Member


The following is a list of some GM production SBC cylinder heads, many of which I consider to be desirable castings for performance.  I have included some information on each casting.  Enthusiasts usually identified SBC heads by the last 3 digits in the casting number.  Some of these castings may not be considered a bolt on head anymore, consideration must be given to the valve seat/fuel issue.  This list is not complete by any means, as there are some heads I could not find any information on.  All SBC heads should either have 6, 7, or 8 digits in the casting number, as an example you can have a "462" suffix head with different prefixes - example 3890462, 3891462, 3990462.  All castings that share the same suffix should have the same basic port configuration, an example of the differences that can be encountered might be in the valve sizing (1.94/1.50" or 2.02/1.60").
 

SMALL CHAMBER PRODUCTION "ON CAR" CYLINDER HEADS

"462" – Could be 3890462, 3891462, 3990462.  The 462 is one of the best flowing production SBC heads.  They were used between 1962-1968 on various HP versions of 302, 327, or 350 engines.  They could have come with either 1.94/1.50" or 2.02/1.60" valves, had 64CC combustion chambers, DO NOT have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  These heads have double hump casting marks.

"461" – Could be 3782461, or 3782461X.  These were an excellent performance head.  The regular 461 casting was used between 1964-1966 and could be found on 327 engines.  They had 2.02/1.60" valves, a 64CC combustion chamber, DO NOT have accessory holes, intake port volume of 161CC's, exhaust 62CC's.  These heads have double hump casting marks.  The "X" castings had the same port configuration, but had larger port volumes, they DO NOT have accessory holes.  The intake port on the "X" casting was 172CC's, and the exhaust port was 62CC's, valve sizing was 1.94/1.50".  The "X" heads had double hump casting marks as well.

"291" – Could be 3912291, or 3917291.  This is another good performance casting.  They were found on 1967-1968 302, 327, or 350 engines.  They could have either 1.94/1.50" or 2.02/1.60" valves, 64CC combustion chambers, DO NOT have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  These heads have double hump casting marks.

"492" – 3991492.  Another good performance head.  They were found on 1970 LT-1 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 62CC's.  These heads have double hump casting marks.  This particular casting head was also available as an "over the counter" head from GM in straight or angle plug configurations.

"186" – 3927186.  Another good performance head.  They were found on 1969-1970 302 and 350 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  These heads have double hump casting marks.

"292" – 3917292, or 340292.  Both are good performance heads.  The 3917292 was found on 1968 327 and 350 engines, had 1.94/1.50" valves, 64CC combustion chambers, straight plug configuration, not sure on the accessory holes, and I do not have any port volume data on these heads.  These heads have double hump casting marks.  The 340292 was available from GM "over the counter".  This version had angle plug configuration, 2.02/1.60" valves, 64CC combustion chambers.  These were known as the "Turbo" heads.

"041" – 3947041, also 3947041X.  A good performance head.  They were found on 1969-1970 302 and 350 engines.  They had either 1.94/1.50" or 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes, I don't have port volume data for the regular 041, the 041X intake port should be 165CC's, the 041X exhaust port should be 65CC's.  These heads have a single somewhat triangular shaped casting mark (slope on the upper left).

"040" – 3947040.  A good performance head (I have read).  Supposedly these heads came on 1968 327 truck engines.  They had 1.94/1.50" valves, 64CC combustion chambers, DO NOT have accessory holes.  I do not have any port volume data for these castings.  These heads also had a single triangular shaped casting mark (slope on the upper left).

"187" – 3927187.  Another good performance head (I think).  They were found on 1969-1970 350 engines.  I believe they had 1.94/1.50" valves, 64CC combustion chambers, DO have accessory holes.  I do not have any data on port volumes for this casting.  These heads have double hump casting marks.

"414" – 3973414.  A good performance head.  They were found on 1970 350 LT-1 engines.  They had 2.02/1.60" valves, 64CC combustion chambers, DO have accessory holes.  I do not have any port volume data for this casting.  These heads have double hump casting marks.
 

LARGE CHAMBER PRODUCTION "ON CAR" HEADS

"487" – 3973487, OR 3973487X.  The regular casting was found on the 1971-1972 350 LT-1 engines, had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 65CC's.  The 487X had 2.02/1.60" valves.

"441" – 3932441.  This head was found on the 1969-1970 350 engines (255hp 350), it was a decent flowing large chamber head.  It had 1.94/1.50" valves, 76CC combustion chambers, DO have accessory holes, intake port volume should be 161CC's, exhaust port volume should be 61CC's.  Not to be confused with 3923441, which was a 1.72/1.50" valve, 327 truck head.

"624" – 462624, 426624, or 458624.  The 458624 was a truck head, with 1.72/1.50 valves – non performance.  The other castings were used mid 70's and up on 350 engines, they came with 1.94/1.50" or 2.02/1.60" valves, had 76CC combustion chambers, DO have accessory holes, intake port volume is 161CC's, exhaust port volume is 62CC's.  These heads are made of thinner castings and are prone to cracking.

"882" – 333882.  These heads were found on early-late 70's 350 and 400 engines.  They had 76CC combustion chambers, 1.94/13.50" valves, DO have accessory holes, intake port volume is 160CC's, exhaust port volume is 60CC's.  These heads are made of thinner castings and are prone to cracking as well.  The exhaust port on these heads is rather weak in my humble opinion, and is not considered to be a good performance head.  I have read some flow numbers on the internet regarding the 882's, and I have a hard time believing some of the flow numbers people are posting on these particular castings.  I did extensive flow testing on several of these particular castings, and was not very impressed with their flow characteristics.  The 441 or 487 are a much better large chamber head (in my humble opinion).  The 882 intake port is very close to that of the 624, the exhaust side is where the 882 is weaker.
 

OVER THE COUNTER GM IRON HEADS

"492" – See listing above.

"3973370" – A good over the counter head.  They had 64CC combustion chambers, supposedly straight or angle plug configuration.  I used a set of these on all 3 of my 383 strokers, they originally came with 1.94/1.50" valves.  We did some major port massaging and installed 2.02/1.60" valves, they responded very well to the modifications and worked very well.  The combustion chambers were 64CC's.  These were a decent iron head, with a lot of potential for performance.

"3965742" – Another over the counter GM iron head.  I have no data on these particular castings, other than they were angle plug configuration.
 

The above data was compiled through various sources, and my own personal experience.  This list is by no means complete, and may contain some errors, just some data (to the best of my knowledge) I thought I would share.  If you have data to share on certain castings that are not included, please share as it will benefit the performance minds of the Chevytalk membership.  One final note here, I have seen several websites that post flow numbers for certain castings, I take these readings with a grain of salt, many variables factor into cylinder head port flow values, and many numbers are somewhat inaccurate (in my humble opinion only).  I hope this list is found to be useful.
 

Regards,

Bert (aka Racerguy – your friendly Chevytalk Performance)

 

gschuld gschuld
New User | Posts: 26 | Joined: 02/05
Posted: 03/02/05
04:49 PM

I can not give you an accurate guess as to the power that your motor will make, but I can tell you that 462 heads when well ported flow very well.  I have a set of 462's on my 383.  It has a GM 400 steel crank, H beem rods, JE 12.5:1 forged pistons, solid lift cam, 750 holley mechanical secondary carb, Hooker super comp headers, etc.  The heads were brought up to 2.02 intake, 1.94 exhaust though.  They are well ported by a long time racer and use roller rockers with a stud girdle.  That motor is in my 69 Firebird with a turbo 350 trans and a 3:91 posi 8 3/4 mopar rear (3350 lbs. without me in it).  The car will run a 12 flat 1/4 all day long at the track using only 255/60/15 BFG radial ta STREET tires.  It has enough power that I can only start out with about 1/3 throttle off the line and slowly work up to full pedal down just before I shift into 2nd gear, and then it usually gets away from me a bit as it churps into 2nd.  I run through the lights at 114mph or so and with a best 60 ft time of high 1.9's.


Long story short...462s can handle ALOT of street motor.  500hp easily when well set up.  Those were the hot head back in the day, and they ran very fast with them.  They do not have the ultimate potential of some of the newer heads, but it seems as though they are well up to the task of your motor.


Good luck and I hope this is useful.


George

 

TubbedCamaro TubbedCamaro
Enthusiast | Posts: 306 | Joined: 08/03
Posted: 03/03/05
10:52 PM

"It has a GM 400 steel crank"

Just so you know GM didn't make a steel 400 crank, they were all cast. So if your crank is really steel, it would have to be aftermarket.

 
TubbedCamaro

gschuld gschuld
New User | Posts: 26 | Joined: 02/05
Posted: 03/05/05
03:38 PM

I loose my head sometimes.  Sorry I was mixing my engines(have a 350 also) there for a minute.  Perhaps I've been sniffing a bit too much of my exhaust fumes.  I apparently "mis spoke" also about my exhaust valve enlargement also.  I said they were 1.94's insdead of the 1.6's that they are.  Again aparently loosing my mind.  Sorry about the confusion.


Anyway, I love the modified double humps.  Not as kick ass as the new stuff, but solid old school power!


George