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'72 240Z Rebuild

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I see the scribe mark now. Don't know about soda blasting but I couldn't imagine it hurting anything top or bottom.

What month/ year is that head? Looks like the casting is not quite as good as mine. Mine is 9/71

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I haven't seen anything that looks like a date code. It's an E31 that came with the tomato colored 240. Triple webers aluminum flywheel f54 bored thirty over with new dished itm pitons. He was following datsungarge.com to the letter. Needed money so now it's mine. Had to do something with it.

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Re: Felpro low-profile Ford valve stem seals. Do any of you have a part number? I would greatly appreciate that info. Thanks.

 

Cheers, Mike

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Re: Felpro low-profile Ford valve stem seals. Do any of you have a part number? I would greatly appreciate that info. Thanks. Cheers, Mike

I've got them on order from advance. I'm using my phone now so give me a minute and I'll post it.

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Thank you, sir. Greatly appreciated. It appears that my Delta stage II cam has mushed the Nissan ones leading to oil consumption. If I am going to the trouble of replacing the seals I might as well use the Ford ones.

 

Cheers, Mike

Edited by Pop's Z

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I'm not planning on cutting any off the bottom unless it's not straight.  I am being careful not to cut much, just trying to blend everything together.  Am I making a big mess?  I got the P79 down for comparison and ended up spending the day cleaning up my garage.  It was 60 degrees and sunny, I needed that. 

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Thank you, sir. Greatly appreciated. It appears that my Delta stage II cam has mushed the Nissan ones leading to oil consumption. If I am going to the trouble of replacing the seals I might as well use the Ford ones.

 

Cheers, Mike

You're most welcome.  After comparing the short Fords to the stock Felpros I think they'll be fantastic for our cars.  I ruined a brand new set just trying to remove them, they fit that tight onto the valve guides.  When I pulled the valves through them they made a "pop" sound.

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I talked with my machinist Monday morning about the bronze valve seats.  What a relief when he said he had a seat machine and thinks he still has some steel seats, both sides too for Nissan heads $5 each.  So a little more grinding then it's his. 

 

My header and 2.5" exhaust came in too.  MSA is still putting their 6 into 1 header in a shoebox and kicking them to my house, it was sticking out really bad but they got lucky.  I went over it last night with a flashlight and found 1 ding but I'm okay with it, $503 for both items.  Free shipping and 10% classiczcars discount. 

 

Broke out my 280 this weekend, I'd forgotten how good fuel injection is when it's right.

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I love their products, but unimpressed with their costumer service.   The first story is absolutely ridiculous, that I haven't brought to the attention of the internet yet, and my second most recent purchase includes damaged exhaust from shipping.  Both without replies from my concerned emails.  It's almost time to let the cat out of the bag on story #1 ha.

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They've got to have a warehouse full of damaged goods.  I sorta blame FedEx too, they shouldn't accept poorly prepared packages but I guess they get paid twice when we return stuff.

 

The salesman on this last header told me only their manifold stud kit would work with that header. Ridiculous but I fell for it the first time.  <_<

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What do y'all think?  I've tried to get it as close to a P79 as I can.  It's not perfect by no means but I'm getting sick of grinding and polishing the combustion chambers.  I'm going to port match the head to the manifold tomorrow.  Then soda blast this weekend and give it to the machinist Monday, so I have time to make corrections that somebody can point out.

 

thanks for looking and critiquing 

Cliff

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Finally back working on the motor.  :)  I hate colds and cold weather.

 

Weighed my pistons today and the lightest is 384.5 grams which happens to be #1.  Number two weighs the most, 390.7g.  I'll get them all the same tomorrow.  I noticed how Nissan balanced them, ground a flat spot on the rod cap, so I'll do the same.  These are different from another set of 2.4s.  They're lighter and have smaller rod bolts.  In the picture you can see the 6 I'm using and  one off to the right that's from a different motor.  Also have the rear main seal from Nissan's part number and price, $31 out the door, but I'll have to reuse my nails.

 

Anyway glad to be greasy again, times a wastin'.  

 

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post-23570-0-21349600-1426890249_thumb.j

 

 

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Most times I balance pistons and rods separately. The location of the weight can make a difference. That may be overkill...

Charles

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Most times I balance pistons and rods separately. The location of the weight can make a difference. That may be overkill...Charles

Those wrist pins don't come out as easy a my boat motors did. Deep socket and a short sledge hammer would drive them out but not these Datsuns.

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The video is what I'm talking about. Heat makes them come out easier. The  machine shop has a machine that heats them beside the press where they press them out. If I was going to balance. I would have someone press them out for me if necessary. Balance them at home and reassemble. I have a 20T press at the house so I can probably do it all here now. A hammer would not be my first choice... :D

C

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So the rods are different? so are the other pistons from a later L24?

Could be 9mm rods from a 73 240?

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So the rods are different? so are the other pistons from a later L24?

Could be 9mm rods from a 73 240?

That's what they are then, if the '73 had bigger cap bolts.  The '73s weigh about 19 grams more.

 

Wouldn't I want less weight at the crank?  That's why I'm grinding the caps like Nissan did.

 

Man am I nervous about cutting the OE block for valve reliefs.  I did all the holes on the spare block and will post pictures of what I did and let y'all tell me which grind looks best and then try to replicate that onto the OE block.

 

I'm trying to get some outside stuff done to my property before the pollen starts.  That stuff kills me now that I've gotten older.  We only get about 2 to 3 weeks of spring before the pollen then it gets hot and humid.  But I could be snowed in. :LOL:  

Edited by siteunseen

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You don't want those heavy rods, I'll take them off your hands and give you another light set;)

Post up pics and we can go from there. Staying on the conservative side is probably best. If you went overbore then you shouldn't need much.

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