Socalman Posted April 15 Report Share Posted April 15 (edited) I need to order a header for this engine to go into my 521. Anyone know the difference between the 2wd and 4wd D21 header? Which would best suit the 521? Edited April 15 by Socalman Quote Link to comment
Stoffregen Motorsports Posted April 15 Report Share Posted April 15 I have no idea... Quote Link to comment
datzenmike Posted April 15 Report Share Posted April 15 4x4s have different torsion bars. I would guess that 2wd will be the closest but the D21 is three generations away from the 521. The KA engines uses an almost identical transmission so it will clear that, just has to clear the torsion bars. Quote Link to comment
Socalman Posted April 15 Author Report Share Posted April 15 Ok. I have no torsion bars, I’m running coilovers on the 521. 1 Quote Link to comment
datzenmike Posted April 15 Report Share Posted April 15 Then either may work. Like I said the header is for a totally different engine that is three generations after the 521. Quote Link to comment
yenpit Posted April 22 Report Share Posted April 22 Your best bet is to look for a "shorty" header, as those tend to fit most chassis. Headers fit the engine that came in any given chassis. I am not familiar enough with these later engines. I assume your exhaust port configuration is O O O O, not like the earlier NAPZ OO OO (similar to a Buick Nailhead)? That said, look for a "shorty" header for your engine & hope it clears whatever configuration you have, then hopefully the exhaust outlet/collector is easily accessible, in your chassis. Quote Link to comment
datzenmike Posted April 22 Report Share Posted April 22 NAPS and KA24E are similar OO OO. So similar that with a slight porting a KA manifold will fit the Z series heads. Quote Link to comment
Socalman Posted April 22 Author Report Share Posted April 22 I’ve got a D21 header coming, will update once I get motor in sometime in June. Quote Link to comment
mrbigtanker Posted April 23 Report Share Posted April 23 Torsion bars is not your problem its the swing out of the headers to steering column that's the problem. Hope they fit. post pics 1 Quote Link to comment
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