datzenmike Posted April 26, 2015 Report Share Posted April 26, 2015 Found this over at the realm.... http://performanceforums.com/forums/showthread.php?67302027-Doing-some-stupid-shit-to-an-old-datsun-head geez those Australians are nuts. U67 Note above the top coolant passages were also welded and below the head bolt holes oval-ed so the head could be shifted sideways over the cylinder. 1 Quote Link to comment
Kirden Posted April 26, 2015 Report Share Posted April 26, 2015 Just read through that whole thread, 237hp at the crank seems intense, especially for a NA 2L. Thanks for sharing that. It would take bigger balls than I own (or can buy) to try something like that :P Quote Link to comment
ggzilla Posted April 26, 2015 Report Share Posted April 26, 2015 Wow, 327 HP from an L20B, I'd be scared to drive that too ... Quote Link to comment
MicroMachinery Posted April 26, 2015 Report Share Posted April 26, 2015 Why? I'd drive the hell outta that. Quote Link to comment
scooter Posted April 26, 2015 Report Share Posted April 26, 2015 I have this bookmarked, im doing this the next time the 2.3 comes apart Quote Link to comment
nad015 Posted April 26, 2015 Report Share Posted April 26, 2015 There are other guys over here That work these even more than this example. They not only weld up the chambers but move the valves over. And raise the exhaust ports by putting a insert on the bottom of the port floor. Completely welding up (or maybe it was filling with epoxy) the inlet port and boring a brand new strait down inlet port from just under the rocker cover was also tried by some until it was found that there were no gains doing this. And the stock inlet port can be made to work well enough with porting and it's the exhaust ports on the heads that just don't keep up. Because of the underperforming exhaust ports, cams are ground to suit, I think they have more duration but less lift on the exhaust than the inlet.? Quote Link to comment
nad015 Posted April 29, 2015 Report Share Posted April 29, 2015 http://ozdat.com/forum/viewtopic.php?f=59&t=24896&start=60 have a look at the pic of this head about halfway down this page, inlet ports closed up and started from just under the rocker cover, note the manifold and the way they have to bolt the manifold on! Quote Link to comment
Stoffregen Motorsports Posted April 29, 2015 Report Share Posted April 29, 2015 Rebello welds the combustion chambers on some of the race motors. It's a tough job with the porous aluminum and proper cooling is crucial. We also used to fix warped heads by heating them with a rosebud torch and overbending them the opposite direction by clamping them to the welding table with spacers on the ends and big c-clamps in the middle. I came into the shop one morning to find a head broken in two. It broke during the night. I wonder what that sounded like. 1 Quote Link to comment
DanielC Posted April 29, 2015 Report Share Posted April 29, 2015 "I wonder what that sounded like." BANG! 1 Quote Link to comment
EastBay521 Posted April 29, 2015 Report Share Posted April 29, 2015 Would have been some cool garage art 2 Quote Link to comment
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