Inliners International Forums General Discussion Engines 230 or 250 Block - Which is it?

I bought the engine a number of years ago and have always considered it a 250. A fellow inliner needs a 250 crankshaft but before tearing out the crank I really want to find out what which one it is; preferably without removing the head to measure the stroke. Here's what I know

1- the block number is 3921968, a 230 / 250 block
2- the number stamped on the plate next to the distributor is F0607CP. I found a list of Nova build information where the last two stamped letters started with a C and have a second letter, but not CP; all of them are listed as 250s. (If there is a comprehensive list of build code information out there please let me know and I'll post it somewhere for everyone)
3- the date code for the block and the head is F 2 7 (1967 or 1977)
4- the head number is 3895054. Leo Santucci's power manual, page 17, lists a 250 head serial number 3895052 and does not list a 3895054 head.

I spent a couple hours looking online without any luck; if anyone knows where to go (to find out) or the answer all help will be appreciated.

Thanks,

Look at the pistons. If they are dished, it is a 250. Look thru a sparkplug hole.

Any luck? (I'm the one trying to buy the crank!)

Just drop the pan and get the casting number off of the crank. Don't let the block try to dictate what the crank is if that's what your needing.

I've just moved on to a 261 I'm installing in a '50 Chevy coupe, I'll pull the pan this week and we'll see.

Any news?