DaTBizz Posted January 25, 2017 Report Share Posted January 25, 2017 Hello again gang, check this out, l20b 86mm 280z flat top piston ,w58 peanut head, hitting stock felpro gasket fire rings bad! Can't get the gasket even ,this is number 3 of gasket change. I've tried to line up the gasket before and after I put the head back on but the piston end up hitting bad. So my questions are , where to go from here? Will a Nismo 88.5 over sized gasket work for a 86 mm bore? Is there supposed to be more space between the top of the cylinder and the top of the block? Seems the gasket is flattened more than 1.2 mm by the piston hitting it. Does Nismo have a better size gasket? Does anyone? What am I doing wrong? I got 3000 miles out of the first gasket until it blew on number 3 cylinder. It's a fully rebuilt head and bottom end from a reputable California Datsun engine builder. Please help if anyone can . Thanks guys. 38/38 weber, when it runs it runs very good! Quote Link to comment
Crashtd420 Posted January 25, 2017 Report Share Posted January 25, 2017 If your using a stock felpro I think it's only a 85mm bore and if your bored out to 86mm your exposing the fire ring which isn't good.... in my opinion the nismo one at 88.5 should be fine to run its plus 2.5mm in diameter.. The stock felpro headgasket covers the l16 and the l20... L16 stock is 83mm the l20 is 85mm Which is a 2mm difference... so.. I am sure other will chime in... Quote Link to comment
Doctor510 Posted January 25, 2017 Report Share Posted January 25, 2017 NISMO 11044-A7651; they run about $100.00 Quote Link to comment
Colbino Posted January 25, 2017 Report Share Posted January 25, 2017 I had the same problem. Went with the nismo 88.5 comp gasket as the 87 was nla. Quote Link to comment
datzenmike Posted January 25, 2017 Report Share Posted January 25, 2017 Or a $23 NAPA Z22 gasket and drill a few more holes. Trim the fronts off and put the used L series one the front with some, (gasp) rtv. The front only seals in vapors and oil spray around the timing chain. 3 Quote Link to comment
banzai510(hainz) Posted January 25, 2017 Report Share Posted January 25, 2017 Baz at Datsport in Australia sells 87mm Headgaskets also. I bought 10 of them but sold a few and down to 5. has graphite and composite(made in Japan under the Durapro Brand) or any part store if your in Australia. soembody said the Victor Renz was 87mm and cheap but cant veryify Nismo Quote Link to comment
DaTBizz Posted January 26, 2017 Author Report Share Posted January 26, 2017 Thanks thats a big help. What's up with the oblong hole NOT in the back of the Nismo head gasket? Do I need it there? Should I create one? 1 Quote Link to comment
Doctor510 Posted January 26, 2017 Report Share Posted January 26, 2017 Thanks thats a big help. What's up with the oblong hole NOT in the back of the Nismo head gasket? Do I need it there? Should I create one? The hole was a POF for the head gasket (point of failure) Quote Link to comment
Stoffregen Motorsports Posted January 26, 2017 Report Share Posted January 26, 2017 X2 on the Z22 gasket. Just make sure you have all the coolant holes punched out correctly. Quote Link to comment
DaTBizz Posted February 1, 2017 Author Report Share Posted February 1, 2017 Hey guys noticed the alignment dowls are missing. Company with the rebuild didn't put them back. I figure that's what's doing it. I'm still going with the oversized nismo gasket. Wondering if the dowls pins are available from anyone? Thanks 1 Quote Link to comment
Crashtd420 Posted February 1, 2017 Report Share Posted February 1, 2017 Definitely use the nismo head gasket for the bore size. You are talking about the hollow pins that go in the head bolt holes right?. I believe I got those pins right from nissan....I think you only need 2 and if I remember right I had to buy a 10 pack I should have some extra ones... I can look tonight when I get home from work if you wanna pm me.... 1 Quote Link to comment
Crashtd420 Posted February 1, 2017 Report Share Posted February 1, 2017 This should be the part number I got 5 if you need 2 1 Quote Link to comment
Stoffregen Motorsports Posted February 2, 2017 Report Share Posted February 2, 2017 The OEM Z22 head gasket is every bit as good as the NISMO gasket, and it's $100 cheaper. It's not even an issue of you-dont-need-it, it's just that there is no difference in quality or strength. Who built your engine? 1 Quote Link to comment
G-Duax Posted February 2, 2017 Report Share Posted February 2, 2017 Not sure where you are buying the Nismo gaskets at, but I have a few, and will sell one for $100 + shipping. Quote Link to comment
datzenmike Posted February 3, 2017 Report Share Posted February 3, 2017 1/2" copper water pipe will work also. Quote Link to comment
DaTBizz Posted February 18, 2017 Author Report Share Posted February 18, 2017 Got the plugs. From Nissan , 10 pc package. Seems to of worked .engine sounds great .still have the question about the oblong hole in the back of the head, block, nismo gasket does not have one. What is that hole for? Was I supposed to drill it out? Thanks. Quote Link to comment
Stoffregen Motorsports Posted February 19, 2017 Report Share Posted February 19, 2017 X2 on the Z22 gasket. Just make sure you have all the coolant holes punched out correctly. I thought this might have been somewhat of a warning. Yes, you need a hole there. Compare the OEM gasket to the new one BEFORE you install the head. Quote Link to comment
john510 Posted February 19, 2017 Report Share Posted February 19, 2017 I used a Felpro l-20b head gasket with 86mm pistons and had no problems. Quote Link to comment
Crashtd420 Posted February 19, 2017 Report Share Posted February 19, 2017 John 510 I hope it was this one... I think That's from California datsun. The one first talked about in this thread is something different.. I thought I read somewhere those felpro 89mm bore gaskets are an out of production item . I could be wrong but whatever you get from a local parts store is a felpro that fits the l16/l18/l20 that is only up to an 85mm bore.... And datbizz definitely compare the openings on the head and block... Quote Link to comment
red13 Posted February 19, 2017 Report Share Posted February 19, 2017 did u have your block deck? I did and found my pistons where above deck height Quote Link to comment
datzenmike Posted February 19, 2017 Report Share Posted February 19, 2017 L20B pistons are 0.45mm below the deck. It's recommended that you not go more than 0.3mm above the deck with the piston to still have some room for rod stretch at extreme RPMs. So if decking, do not remove more than .75mm. 1/3 of a mm protruding piston is ok 1 Quote Link to comment
distributorguy Posted March 16, 2017 Report Share Posted March 16, 2017 DNJ gaskets are 87mm, available from Rockauto. Same as the larger Felpro and other. Quote Link to comment
banzai510(hainz) Posted March 30, 2017 Report Share Posted March 30, 2017 I have a DNJ I bought . I don't like it. Quote Link to comment
Jersey Posted April 9, 2017 Report Share Posted April 9, 2017 Hey guys noticed the alignment dowls are missing. Company with the rebuild didn't put them back. I figure that's what's doing it. I'm still going with the oversized nismo gasket. Wondering if the dowls pins are available from anyone? ThanksI was going to ask if you had the dowels in. Quote Link to comment
hang_510 Posted April 19, 2017 Report Share Posted April 19, 2017 it's just that there is no difference in quality or strength.nismo is the only HG that has not failed me.I feel its worth it. Quote Link to comment
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