redxm
Well-known member
I plan on building an engine for my XM later this year. I was planning to build a 200.
I have a freshly bored & decked block, new pistons (.060) new bearings, arp stud kit, cam & chain.
What my dilemma is, that I discovered I have a 221 bottom end in the shed (I have a lot of stuff in my shed)
After doing some reading here I realise there are a few questions regarding parts swapping
The 200 is out of an XR
Mains bearings. I have read that the 200 diameter is 2.2486 & the 221 is 2.3986. Is this so or is the smaller measurement the US 200?
Timing chain length. 200 uses 25 link chain. 221 uses 26 link. Is this the same as the XY-XB 250?
Pushrod length. Anyone got the measurement for 221 rods
Crank Snout. Getting mixed messages here. I assume the snout is the same from XK thru to XB, seeing as I just put an XY balancer on a XP 170
Cam bearings - Are these the same. If I cant use my new cam I think it will be the dealbreaker.
Flywheel PCD. Seems to be the same. My car is auto, with the flexplate from a wide block XP 170
Apart from the obvious weight difference & slightly taller deck height is there anything else that may trip me up.
Head will be 2V ported, cc'd, new valves, roller tip rockers etc etc
I have a freshly bored & decked block, new pistons (.060) new bearings, arp stud kit, cam & chain.
What my dilemma is, that I discovered I have a 221 bottom end in the shed (I have a lot of stuff in my shed)
After doing some reading here I realise there are a few questions regarding parts swapping
The 200 is out of an XR
Mains bearings. I have read that the 200 diameter is 2.2486 & the 221 is 2.3986. Is this so or is the smaller measurement the US 200?
Timing chain length. 200 uses 25 link chain. 221 uses 26 link. Is this the same as the XY-XB 250?
Pushrod length. Anyone got the measurement for 221 rods
Crank Snout. Getting mixed messages here. I assume the snout is the same from XK thru to XB, seeing as I just put an XY balancer on a XP 170
Cam bearings - Are these the same. If I cant use my new cam I think it will be the dealbreaker.
Flywheel PCD. Seems to be the same. My car is auto, with the flexplate from a wide block XP 170
Apart from the obvious weight difference & slightly taller deck height is there anything else that may trip me up.
Head will be 2V ported, cc'd, new valves, roller tip rockers etc etc