head id

[wlf89]

does anyone have a link to a place that show the head casting marks like the double hump marks and etc. my brother bought a place and it has an old 56 chevy school bus on it with a motor im gonna buy and put in my truck trying to find a little info on it the suffix code is cjd which tells me CJD 71 350 Chevelle 270 hp L-48 TH 350 4-Brl Hyd Cam just wondering if i has the original heads for that motor or been switched i can get a pic of the head mark in a day or two

[Sinister]

Pull a valve cover and get the casting number. Then go to www.mortec.com

[wlf89]

heres the pic

[Phlebmaster]

I found this link when searching for my head information. I hope it helps.

http://www.chevytech.com/3c000.html

Here is another: http://www.chevellestuff.com/qd/head...ng_by_year.htm


And another..lol http://www.fastnuf.com/Headguide.html

I cannot find your specific heads casting shape, take the valve cover off and look it up on mortec as was stated before.

[Beuford]

Here is a picture of the markings

[wlf89]

3973487 is the number when i got home and looked it up some of them has x on the end of them i dont know if it did or not i couldnt see it to good i didnt have a light but it list the same specs for them anyway does anyone know if its a good head maybe the hp rating

[Phlebmaster]

Originally Posted by wlf89

3973487 is the number when i got home and looked it up some of them has x on the end of them i dont know if it did or not i couldnt see it to good i didnt have a light but it list the same specs for them anyway does anyone know if its a good head maybe the hp rating

3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber

The 487 heads will flow as well as any factory double hump head. The only real problem with them is that they have poor combustion and burn characteristics compared to the earlier closed chamber style heads.

You can get 220 CFM out of them without too much work and they will make a good cheap set of heads. They are heavy castings too, and are not crack prone.

They are among the best of the open chamber heads in terms of airflow, but flow numbers alone won't equate to big horsepower numbers.

[wlf89]

how come the casting marks they list aint like the casting marks on my head

[BarryB]

If i remember correctly this heads were used on Gm performance engines such has cop motors, camaro's and possibly corvettes. They are a good head as mentioned, but just look into how much it's gunna cost to get any HP from them. I have a set of 041. I have a set of top knotch heads now, but I spend around 700- 750 on them getting the ready. I could have bought at the time a set of world product heads for around 850, without all the work I put into the 041's

[Phlebmaster]

Originally Posted by wlf89

how come the casting marks they list aint like the casting marks on my head

There are some variations to the casting marks so you can't alway count on them for positive ID.

[wlf89]

i aint looking to build no drag motor just for my 69 pickup that i drive every once in a while but i would like to have a little more power than i do with my 350 thats in it now that came out of a 82 blazer i think 130-150 hp

[wlf89]

where is the block number located? if i remember right i think they are around the distributer somewhere but cant remember. can i see it with the motor still in the bus or have to wait untill i pull it

[wlf89]

is this motor likely to be a 2 or 4 bolt main