mydooris4

Hi, I'm trying to swap my rb20 head to rb26 camshafts. I noticed the hydraulic lifters have an oil hole on top for the cam lobe but solid lifters do not have the hole. Do rb26s have a different cam oiling design than the hydraulic rb20? Similar to how the L-series can have a drilled cam or an oil spraybar? Also are valve springs different from factory between hydraulic and solid lifter rb25s? Thank you

Hi, this is my first post to this forum, thanks for having me! I bought an rb20 head and am wondering if it is acceptable to use it on an rb25 block. My concern is that the rb20 head has a combustion chamber sized for a 78mm bore and I would like to use it on an 86mm bore block, do I need to port the chamber to match or is it okay to have the chamber overhang the bore? From the factory it had a flat top and bottom overhang so I assume it would work around the whole circumference? Thank you for any advice