The only listing I could find ending in 041 was 3947041, which was for 69 and 70 302/350. It's a performance head with angle plugs and 64 cc combustion chambers.
hth
58cc
Under the rocker cover.
A small or big block Chevy have a casting number on the top of the block behind the driver side head. MorTec has Chevy casting numbers listed online.
write down the casting number under the valve cover and compare it to the list of chevy head castings at mortec.com
Remove the valve cover and you will see it stamped into the top of the head.
1970-71 Chevrolet Small Block 400cid heads.
casting numbers are on the back of the block. there are numbers on the pad by the head on passenger side front that will reveal information too
I think you may have misread the casting numbers. It should be a 3998993. The 8's and 3's look a lot alike.
THE BLOCK CASTING NUMBER IS BEHIND THE CYL. HEAD. SORRY CAN'T REMEMBER WHICH HEAD. IT USUALLY IS A RAISED SEVEN DIGIT NUMBER. THE CYL. HEAD CASTING NUMBER REQUIRES REMOVING THE VALVE COVER AND CHECKING THE RAISED CASTING NUMBER ON TOP OF THE HEAD. YOU CAN CALL A DEALER OR A ENGINE REBUILDING SHOP AND GIVE THEM THE NUMBERS. THEY SHOULD BE ABLE TO GIVE YOU THE YEARS THAT CORRESPON TO THE CASTING NUMBERS.
What Chevy engine has the casting number 3970011?
It has Head problems.... if it has a casting number of 706 on the top end of the head, then have the head pressure tested. It cracks in the #1 head bolt hole area.
Under the valve cover where the valve springs are.