Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 Yeah, I know I'm limited, I know the Z valves will fit for sure and I only run (leaded) 110 octane racing fuel in the race car. That stuff is costly by the way... about $7.00 or so a gallon :angry: Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 More oics of the A87 head... It measures just over 1 1/4 inch across the intake hole... I couldn't get a decent photo with my tape measure. :P Quote Link to comment
Jester Posted February 7, 2012 Report Share Posted February 7, 2012 You could always do like Mike said and strip all the goodies out of the 210 head, then, use it for practice and start porting it out. Start with the exhaust side so you can get a feel for how the tools dig. Then when your comfy with it, go after the intakes. Strip the valves and start teaching yourself how to blend your valve seat area. Another guy on here is building a LZ24 that is getting valves that are just under 1.80" It is about as much valve as you can physically make fit. He is having the cambers reworked to make room for them. I'll make him post some pics on here when it gets back from the machine shop. Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 sounds cool, I'll watch for those oics... Quote Link to comment
wayno Posted February 7, 2012 Report Share Posted February 7, 2012 I bet these can be opened up to 1 1/2 inch, but I don't know where to grind myself. This is one of my W53 heads. Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 I'm betting they can too. I think I'm gonna try it with my 210 head first. :D Quote Link to comment
datzenmike Posted February 7, 2012 Report Share Posted February 7, 2012 Yeah, I know I'm limited, I know the Z valves will fit for sure and I only run (leaded) 110 octane racing fuel in the race car. That stuff is costly by the way... about $7.00 or so a gallon :angry: 110??? What compression you running??? 12 to 1 Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 It's not the compression that I worry about, I run my engine at around 38 degrees advanced and it's locked in at that advance. My distributor advance is welded up. Most race car guys do the same thing. I run it like that to get the most out of a tiny motor. Quote Link to comment
datsunaholic Posted February 7, 2012 Report Share Posted February 7, 2012 That A87 has been significantly milled. Quote Link to comment
ggzilla Posted February 7, 2012 Report Share Posted February 7, 2012 38 degrees will work with pump gas. But 38 degrees and high compression requires high octane fuel. Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 That A87 has been significantly milled. What one? mine? :unsure: Milled = higher compression :D Quote Link to comment
datsunaholic Posted February 7, 2012 Report Share Posted February 7, 2012 Yes, but milled too much means loose timing chain and difficulty finding the right cam timing. You can of course shim the cam towers. Quote Link to comment
banzai510(hainz) Posted February 7, 2012 Report Share Posted February 7, 2012 also If oversize valves on L16 and a big cam the bore of the cylinder must be notchd as it could hit the bore edge. personally why waist time. the machine shop has to put new seats and if done wrong they could pup out. just use a 42mm valve size head Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 It really doesn't look milled to me though. How can i check it? Quote Link to comment
ggzilla Posted February 7, 2012 Report Share Posted February 7, 2012 You can tell because the 'A87' is cut off partially on the bottom. Quote Link to comment
Dirttrack510 Posted February 7, 2012 Author Report Share Posted February 7, 2012 I'll have to look at it again when i get home. i think it just looks that way in the pic, crappy camera Quote Link to comment
datsunaholic Posted February 7, 2012 Report Share Posted February 7, 2012 There should be between a 1/16th to 1/8 gap at the bottom of the numbers for an uncut head, but it varies. None of the "marks" signifying the maximum milling are visible, however those didn't show up until the mid 70s, so it might not have had them to begin with. I've seen heads milled more than that, though. Quote Link to comment
docbainey Posted February 7, 2012 Report Share Posted February 7, 2012 You can tell because the 'A87' is cut off partially on the bottom. What he said. Quote Link to comment
Dirttrack510 Posted February 8, 2012 Author Report Share Posted February 8, 2012 I got some d.i. Water at work, so i can cc the heads when i get home. What did they measure when new? Quote Link to comment
flatcat19 Posted February 8, 2012 Report Share Posted February 8, 2012 On the A87 C/C...about 41cc. Quote Link to comment
Dirttrack510 Posted February 8, 2012 Author Report Share Posted February 8, 2012 Thanks Quote Link to comment
DAT510 Posted February 8, 2012 Report Share Posted February 8, 2012 this is what a unshaved head should look like Quote Link to comment
datzenmike Posted February 8, 2012 Report Share Posted February 8, 2012 You can also measure the head thickness from valve cover to head gasket surfaces. Stock would be 4.248" Quote Link to comment
wayno Posted February 8, 2012 Report Share Posted February 8, 2012 Here is a clear photo of what unshaved might look like. Lots of space between the bottom of the head and the letters/numbers Quote Link to comment
Dirttrack510 Posted February 8, 2012 Author Report Share Posted February 8, 2012 You can also measure the head thickness from valve cover to head gasket surfaces. Stock would be 4.248" I just measured mine and I got 4.251, but I have a cheap ass gauge. :P I'm assuming it's not shaved or my head was really tall when it was new... :unsure: It does however measure within a few thousanths of the thickness/height of my 210 head. I forgot my D.I. water at work :( , so I'll have to CC the chambers tomorrow. Quote Link to comment
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