Thread: 396/427/454 questions

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this is my first post and im hoping to get some good info from this site.

i recently picked up a 396 and had some questions. im very familiar with small chevy and have built alot of them, but never messed with a big block. i ran the numbers on the block(3855961) and mortec says 65-66 396 or 66 427. it been taken .040 over already, but i planned on taken it .060 anyways. the crank is a 6223 crank(i think, the numbers 6223 are at the very front of the crank, is that where they are?) 6223 are the only numbers there and are pretty big. the casting numbers on the heads are 14081045, which is 454 open port oval chambers.

this is what i want to do: at least 450-500hp and bout the same torque. i want to put it in a pre 75 car or truck, built for the strip but able to rip on the streets on a weekend or somthin.oh and my friends said i couldnt make a big block spin even close to 6500 rpms so i want it to do that too.

what i want to know is how do i tell if its a 396 or 427? the 396 and 427 both used that crank and block, how do i tell? i dont have a mic, so i cant measure the bore, but im tryin to get one.

i want a 427, so if it is a 396, i can put the crank in a 454 block and use 427 pistons and make a 427 right?

also, i was wonderin bout the heads. anybody know the valve size, combustion chamber size, and/or how much they flow? or even how well theyll work on a built motor?

i know this is long but i appreciate any replies/info. thanks in advance.

ace

1. your friends do not know much about big blocks. with the rigth parts they can go to 75000 rpm+ 2. to make a 427 you need a 454 block or a427 block and a366 396 402 427 3.760 crank this will make a 427. some 396 block can be bored out out 4.250 but not all.this wound need to be ultrasonic check for wall thickness.on the heads valve size areO port 2.065 and1.720and gm rec ports 2.190 and 1.880 the O port heads work good and need very little work bowl job and you can put 2.190 and1.880 in them there is the very small o ports and the big O ports look for the big one for hi rpm.and to go to past 6500+ you are going to need some good stuff but can be done i have built many of them

I am new to this also, but am excited about the information available here. I have a 427 tall deck, Ive looked for a dual plane intake that wont need spaceres. Know of anything?

And what would it take to get a serpentine belt system on it?

Originally posted by 72fool
I am new to this also, but am excited about the information available here. I have a 427 tall deck, Ive looked for a dual plane intake that wont need spaceres. Know of anything?

And what would it take to get a serpentine belt system on it?

no i do not

http://www.billetspecialties.com/ite...pid=695&rdir=1
http://www.marchperf.com/cbb_serps.html