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IIRC The CA20 uses the same headbolt diameter/pitch as the UK versions of the block, which is slightly larger and uses a more coarse thread pitch.tommey wrote:What was the problem with the headbolt thread?
Smaller?








I do have a lightened flywheel for the CA20, but I could use one more. Do you have one you want to sell? And yes, the CA20s I've acquired are 6-bolt.What's your plan for the flywheel? The CA20 crank is only a 6 bolt, right?
I believe they can take some decent abuse, but not on the level of the CA18 stuff. Not more than 10psi on the pistons and not too much more for the rods.How do the rods and.bolts look in terms of strength compared to CA18 rods?
Power goals are not important for me at this point. But I must say, The CA20 looks pretty stout and I am building it to withstand what I have to throw it. I've already ordered the pistons and rods for it. I chose to go a different rout than the 4G63 rods on because I found some that appear to spec-out more in line with the original CA20 rods less the modifications, but I will be sharing that with you guys when I get them. I purchased two sets, so if I fail, I would lose some decent coin.Do you have any power goals with this?
I have not measured that yet, but I will let you know when I work my way back to these CA20 blocks. Just too busy with everything else.......Whats the deck height?
The sprocket I'm referring to is the crank sprocket that drives the timing bolt a.k.a lower timing belt gear. I have the sprocket from the CA20, but I needed to have them milled to a sleeve that corrects the difference in diameters between the CA18's crank nose and the CA20's crank nose. The purpose of this modifcation is to allow the use of the standard CA18DET crank pulley and crank timing sprocket/gear. With this done, I can figure out this mysterious timing belt that no one seems to want to share and I guess I could understand that. But I will be sharing whatever I do with this motor with you all and hopefully I can build it to be and do something special as well as being rugged enough for an everyday beat-downNot sure what you meant regarding the sprocket?