Re: 1970 Z28 intake, carb, heads and air cleaner find
 

OK so here are the photos. January of 1971. Straight plug 492 heads that do not exist. LOL

https://www.yenko.net/ubbthreads/pics..._heads_002.jpg
https://www.yenko.net/ubbthreads/pics..._heads_003.jpg

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

my uncle raced some 292s in the 90s..he bought them new sent them out for some work and bolted them on..i dont know what a diff they made but he was really impressed and bragged about them all the time..at that time he said they where the most powerful upgrade he had ever made

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

Casting number should be 3991492, and the Date screws are two different ones. Somethings not right with those. Never seen them as straight plug heads.

Brandon

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

So now they are fake? LOL

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

I must admit that these are odd. But the casting number has not been played with. The guy I bought the parts from had these parts for over 30 years and he is the one that junked the car and knew the car from new. Small town here in NB. He is a car guy , says there were two 70z cars there. One orange? and the other Citrus green. The parts are from the orange one. I am no expert on the 70 Z cars, but I do recognize when something like a casting number is played with. All the other 492s I have or have had are the 3991492. And this number was used in 2.02 or 1.94 versions. Go figure. I have not checked the intake or carb numbers which I will do shortly and post..

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

Back in the early seventies I worked for Cal Corp aero marine.We raced cigarette boats with twin LT1s.The heads we used were straight plug 492 right from the gm parts counter.They made great power.We switched to 292 angle plug they made a big difference.

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

Am I the only one that thinks it reads 388 482 ?

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

No. That's what it looks like to me Charley. :smh:

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

...I see 386 482.
Which were used on 283cid. & 307cid. small blocks from 1968-1973.

Re: 1970 Z28 intake, carb, heads and air cleaner find
 

Holley # is 3972121 and the intake is 3972110. The original throttle cable bracket and lines are still there. The dirtiest parts I ever purchased. One head is 388 492, the other is 3991492.