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Club Member
Location:
sydney
Registered:
May 2002
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Re: 3A/4A and 4AG Blocks?
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Fri, 16 January 2004 05:26
 
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3AC and 4AC blocks are the same, dunno about the two cranks but id suspect they are identical, early 4ag blocks are the same as well but rumored to have a better metal composition, i never could prove this to be true, I used a 4ac block to run 4age gear and had no problems at all
as for bore and stroke i think the bore sizes are the same and its just the stroke that is different on the 2A 3A ( dont take that as gospel! ) cant give you exact stroke but I think matti Kalatis website hhas all those specs
early and late 4AG blocks are different in terms of the extra ribbing to improve strength, there may also be composition differences?, very late G blocks also had the oil return fitted to suit the late 100Kw heads.
I have a whole lot of pictures of 4ac , 86Kw , 100kw blocks cranks ,rods ,pistons, etc etc side by side but cant scan them at the mo due to "technical difficulties", might be able to upload them in a few weeks after i finish some other more important things.
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