ae174agze Posted September 12, 2008 Report Share Posted September 12, 2008 will a 16v 4age big or small port head fit on a 20v bottem end beacuse ive been told by a few people that it can, and some it carn't i'd like someone to let me know the correct answer cheers Quote Link to comment Share on other sites More sharing options...
dfunkt Posted September 12, 2008 Report Share Posted September 12, 2008 if thenobbler sees this, he should be able to tell you how possible, and how much work is needed to fit a 16v head to a 20v block. his old twincam was running this setup. Quote Link to comment Share on other sites More sharing options...
beerhead Posted September 12, 2008 Report Share Posted September 12, 2008 The blocks are identical, I've even dummied up a 4AC head on one. You'll make an interference motor for sure, but the compression will be up there. If its a smallport head there won't be an oil drain port on the block though. Quote Link to comment Share on other sites More sharing options...
ae174agze Posted September 13, 2008 Author Report Share Posted September 13, 2008 so big port is a better for 20v bottem end Quote Link to comment Share on other sites More sharing options...
cam_ae92 Posted September 13, 2008 Report Share Posted September 13, 2008 If its a smallport head there won't be an oil drain port on the block though. Smallports have the oil drain. Bigports don't. 20V and smallport blocks are identical along with the crank, both are the 7 rib block. Quote Link to comment Share on other sites More sharing options...
Jono Posted September 13, 2008 Report Share Posted September 13, 2008 also identical to the ae92 onwards GZE Quote Link to comment Share on other sites More sharing options...
ae174agze Posted September 14, 2008 Author Report Share Posted September 14, 2008 ahhh so i'll need a small port head wwith a silvertop block is there any problems with the pistons Quote Link to comment Share on other sites More sharing options...
beerhead Posted September 14, 2008 Report Share Posted September 14, 2008 The number of ribs, bearings, crank, rods are much the same. But there is no provision for an external oil drain like a 100kw block. The 20v head had a new design for the oil drain and didn't require an external drain to stop the head filling with oil. You'll have an interference motor with any 16V head on the 20V block. Also the keyway on the crank is a few degree's out of whack. You'll need adjustable timing gears to get it spot on. also identical to the ae92 onwards GZE Quote Link to comment Share on other sites More sharing options...
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