A
Anonymous
Guest
has anyone ever stroked a 170 or a 200 to a 250?
A
Anonymous
Guest
i got no need to stroke the 250, maybe destroke it though 
Nope. The cam is too close. No room at the inn!
1. The 144-200 I6 had a cam about 4.25" from the centreline, 7.808" tall. Stroke from 2.5, 2.94, 3.126". Rods very shallow at 4.71 or 4.78", depending on what book you read, and what side of the Pacfic or Atlantic you are on.
2. The 221 I6, not used in the US, was used in Aussie or Argentina had the cam mounted furter out with a 8.425" tall block. Strokes were 2.94" for the 188, and 3.46" for the 221.
3.and the US 250 had its cam about 4.5", 9.469" tall, 3.91"stroke,
4.so did the Aussie 250/x-flow, about 9.48" tall, 3.91" stroke.
The pan rail was widened with each of the four generic blocks to clear the crankshaft. Started off at about 9.125", ended up over 10 inches wide.
The foundary was the key to enlarging the engine. Unlike the small block Windsor V8's you can't go from a 221 to a 302 or 347 with no physical changes. There isn't enough meat on a 200. Stock rods, main bearing sizes and pistons are quite trim, and any increases need radical block mods which won't help at all.
A clue of the problem is the cut-down Falcon I6 used in the I4 Tempo/Topaz. To get a 3.3" stroke on the 2.3 HSC, they had to move the cam out, and raise the block to 8.63". The 3.585" stroke 2.5 HSC was even taller at 9.38". Rods were 5.45 and 6.00" respectively
1. The 144-200 I6 had a cam about 4.25" from the centreline, 7.808" tall. Stroke from 2.5, 2.94, 3.126". Rods very shallow at 4.71 or 4.78", depending on what book you read, and what side of the Pacfic or Atlantic you are on.
2. The 221 I6, not used in the US, was used in Aussie or Argentina had the cam mounted furter out with a 8.425" tall block. Strokes were 2.94" for the 188, and 3.46" for the 221.
3.and the US 250 had its cam about 4.5", 9.469" tall, 3.91"stroke,
4.so did the Aussie 250/x-flow, about 9.48" tall, 3.91" stroke.
The pan rail was widened with each of the four generic blocks to clear the crankshaft. Started off at about 9.125", ended up over 10 inches wide.
The foundary was the key to enlarging the engine. Unlike the small block Windsor V8's you can't go from a 221 to a 302 or 347 with no physical changes. There isn't enough meat on a 200. Stock rods, main bearing sizes and pistons are quite trim, and any increases need radical block mods which won't help at all.
A clue of the problem is the cut-down Falcon I6 used in the I4 Tempo/Topaz. To get a 3.3" stroke on the 2.3 HSC, they had to move the cam out, and raise the block to 8.63". The 3.585" stroke 2.5 HSC was even taller at 9.38". Rods were 5.45 and 6.00" respectively
