need help to I.D. some pontiac heads

Hi bought a 79 trans am with a 400 in it and the owner did not what was all done to it besides being rebuilt and bored .30 over turned out it has headers dual 2.5inch flomaters elbrock perfromer intake holly 670 steet adv carb car has unknow cam but sounds big as it has a choppy idal anways the head dont match the color of the block and I am hopping they were changed to something a lil better the later smog heads

heres all the numbers I could get off of them    on   0101  A  36   L010 DN

THANKSSSS!  

What is the casting mark on top of the center exhaust port of each head? Ie: 6X, 48, 5C and so on.
Steve  
Trying to help... 'cause we don't all have to learn the hard way!

hey man thanks for thr fast response!

on both heads reading from left to right it it looks to say 84??is that head or maybe I am readin it wrong?
anyways my next question would be what the compression ratio for these heads and are they any good?
THanks  

can send pics aswell  

Is there any chance it is a 94? This would make sense as the date code appears to be December 01/1970 from the numbers you posted (L010, L being Dec., 01 being the first, and 0 being 1970). If so the heads are somewhat small valves (1.96" intakes and 1.66" exhausts) with 96cc combustion chambers which will give somewhere between 8.5:1 and 9:1 CR depending on head milling and piston deck height/oversize and actual chamber volume. These heads were installed on 2bbl 350's in 1971.
Steve  
Trying to help... 'cause we don't all have to learn the hard way!

THnaks for the info heres some pics to they may help it seems the heads have 2 diffrent date codes one being L010 and the other is 0101 aslo it may be a 9 very hard to tell

also IF this are heads form a 350 are they at least ok performance wise?would they be better then the stock heads from a late 70's 400???the compression numbers seem like they would be better as I was told later 400's had low 8's compression
Thnaks and correct me if I am wrong



















 

Ya those are 94 heads I would not consider them a performance set of heads they have roughly the same size chambers as the later 400's like 4x and 6x but the 94 is the small valve heads.  
professional hi-performance engine builder

Horsepower sells engines and torque wins races

so do you think they are worth workin with having them milled and such or would I be better of looking for something better. any recomindations??look for something that will run on pump gas like so something around 9.5compression maybr ram air 3 heads??
Thanksss!  

hey found some 670 heads on ebay what do you all think about thoes hered good things?
lookin for more ponys I have to beat my older brohers rice box!!
thanks  

They are good heads but you will need the chambers opened up some so the CR won't be to high they have 72cc chambers and will give you a 10:1Cr.  
professional hi-performance engine builder

Horsepower sells engines and torque wins races

whats the highest CP I can run on pump gas with iron heads is int like 9.5:1??
THankss  

Yes 9.5:1CR is the highest on pump gas and iron heads that is why I said you will need to have the chambers opened up some.  
professional hi-performance engine builder

Horsepower sells engines and torque wins races

what would be a good head that would give me around 9.5: CR and have nice big valves
with out any head work done
Thanks!  

Well depending on deck height and head gasket used you will need around a 76-80CC heads best way to get that is to open up the chambers on a set of 12,13,48,62 or 670 heads.  
professional hi-performance engine builder

Horsepower sells engines and torque wins races

found some 48 heads now waht does opening the chambers do for the head?increase air flow?
increase/decrese cr???
Thanks