454 Heads on a 396?
08-20-2007, 09:30 PM
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454 Heads on a 396? As the title states. Could I run a set of 454 BBC heads (casting 343772) on a 396 block? Id like to find out before I get everything bolted down and find the valves hit the block.
08-23-2007, 12:06 PM
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All big block heads will bolt up without problems with the valves hitting anything. I would advise against putting 71 and up 454 heads on a 396 since they have open combustion chambers unless you have a big dome like the factory 396/375hp piston.
08-25-2007, 02:41 PM
#7
Depending on the cam, you may want to notch the block around the bores where the intake and exhaust valves come close. On the 396s theres a little notch there already.
The best way to view it is from the bottom of the bore. With the pistons out, bolt a head on, flip the motor over, and with checker springs installed, move the valves open and closed and see how close they come.
BTW, this is only critical when using 2.19/1.88 valves, like come in the factory square ports. Otherwise, with the smaller valves in the oval ports, its no big deal.
The best way to view it is from the bottom of the bore. With the pistons out, bolt a head on, flip the motor over, and with checker springs installed, move the valves open and closed and see how close they come.
BTW, this is only critical when using 2.19/1.88 valves, like come in the factory square ports. Otherwise, with the smaller valves in the oval ports, its no big deal.
