1397 or 1441??? Spacer plate on my Busa

I bought a motor from a guy whos dad had passed away and he didnt know much about it. I see it has ported heads and a spacer plate and also a carpenter cylinder head.
so what i know is
ported
spacer plate
carpenter cylinder head
I see 4 arp studs (the 4 that go all the way through)

I will probably pull the valve cover to see the cams etc.

how do I know if its a 1397 or 1441?

what oil do you run with this specific filter?

I am definitely running race gas

thanks guys
 
Are you sure it's a stroker motor and not a turbo motor? How thick is the spacer plate? did you pull oil pans cause rods can tell you alot also...
 
Are you sure it's a stroker motor and not a turbo motor? How thick is the spacer plate? did you pull oil pans cause rods can tell you alot also...

Thanks I will. I know it's some kind of stroker. Guy passed away and pulled motor to put in something else first. His son said he thinks its a 1397.
 
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