The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 400 sbc heads and steamholes? add them or?

68Gold/white · 03-23-2018, 03:05 PM

The holes HAVE to be there if used on a 400 block, period!!!

There are exceptions, all are racing super-de-duper high HP applications that have nothing to do with what you or I will ever do with one of those engines!!!

YES, the steam drill heads CAN be used on any other non 400 engine, like a 350!!!

The 400 block has siameased (spelling?) cylinders that need the holes to help with cooling...ALL other small blocks do NOT have this feature (old school small blocks).

400's are AWESOME engines!!!

03-23-2018, 03:05 PM	#2
68Gold/white Registered User Join Date: Sep 2011 Location: Ark City, Kansas Posts: 3,298	Re: 400 sbc heads and steamholes? add them or? The holes HAVE to be there if used on a 400 block, period!!! There are exceptions, all are racing super-de-duper high HP applications that have nothing to do with what you or I will ever do with one of those engines!!! YES, the steam drill heads CAN be used on any other non 400 engine, like a 350!!! The 400 block has siameased (spelling?) cylinders that need the holes to help with cooling...ALL other small blocks do NOT have this feature (old school small blocks). 400's are AWESOME engines!!!