This.Ok its importent to use correct gasket for the block, I assume your block is a mark IV 454(70-90). They was made both series cold and parallell cold, wrong gasket and you will have problems. You can convert serie to parallell of you want. Here are some links.
Ok guys. Talked with Mark Jones this afternoon and he said based on my picture of my Block, casting number 289, I need to drill two holes per side on my decks. See attached picture and if you’ve done this before can you give me some pointers? He said use the 1037 gasket. I’m assuming that...www.chevelles.com
Hey all. Stumbled across this question and need to figure out if I have an issue. So... early blocks 65 thru 70 have a different deck design then 71 thru 90. Parallel and series flow cooling designs I am told. Can an overheating problem develop if you use a parallel flow style gasket (fel-pro...www.chevelles.com
Also When the heads come off the first thing I’d be checking is the head gasket fitment . Would suck to have the same problem with new heads........or take your heads off and check the headgasket, and maybe you’ll luck out and it’s just that simple.
On a side note. if people are trying to get heads in a reasonable amount of time, brodix rr-o, rr-r, ds320 and ds 360 are what’s in stock from Spohn in Georgia, has pallets of them ready to go.