Date these heads

[joetiii]

I'm curious whether these 3.0 heads are early or late style. They are dated 7/79 or 8/79. I think changeover to the new model is around that same time of the year.

[cgarr]

May be late, are there fins missing in some corners? or are they full finned?

[jluetjen]

If you physically have them in your possession, the best bet is to measure the intake ports.

[tom1394racing]

The early 79/79 heads will have 39 mm intake ports.

The later 80-83 heads will have 34 mm intake ports.

[joetiii]

Naw... I don't have them in my possesion, they are over in the for sale section. One head happens to have a few fins cracked, which is what is being shown, (I Think)

[jluetjen]

I'd ask the seller to measure the ports for you.

[KFJ_SC]

Same part # on those pictured as my large port heads. Assuming the smaller port heads also changed part #s then these are large port.

Is this the guy that wants $750 for them?

[jluetjen]

Actually the number that you're referring to is the casting number, not the part number. The casting number may not have changed with the change in port sizes -- they may have used the same casting with different port inserts.

[joetiii]

same guy. know him?

[KFJ_SC]

John - yes, casting #, you don't know how many times I've done that - one day I'll learn .

Joe - nope, don't know him. I'm looking 1 or 2 large port heads and saw his listing. $750 seemed pricey and after seeing the pics I'm gonna steer clear.