Machining questions

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MrSoutherland
Posts: 263
Joined: Sat Oct 03, 2009 4:44 am
Car: S13 - Sr20

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I know contacting the machine shop itself can give me prices. However I want to know what you guys have paid so I know if I'm getting a "good deal". I would love to have mazworx do my work but cannot get a response after 3 attempts to contact them. The work doesn't have to be done by them, but by a shop that knows what there doing.

Setup: Stock block, ARP hardware, metal head gasket, built head.Looking for around 350-400 hp. Gt2871r, jwt ecu

I'm doing a full rebuild from port and polish, check and decking the head/block. Maybe even have them assemble the block for me.3 angle valve job? Ye or neh for the goal I want to reach?Hot tank, honing, ect. Am I missing anything?

What should I expect to dish out with out them assembling the block and with them assembling the block?Any and all advice would be awesome! I'm knew to rebuilding but I have owned an sr before. So please help or point me in the right direction If you guys/gals can.


WizardBlack
Posts: 99
Joined: Wed Sep 19, 2007 5:35 pm
Car: 1977 Datsun 280Z w/ RB25DET

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First, you need to know what you want.Port and polish is not 'rebuilding'. You will probably want to go with a shop that has done P&P on small displacement turbo imports before.As I understand it, you simply want the bottom end cleaned up and have the stock head turned into a ported one with a valve job?The block refers to the bottom end. If you have new bearings installed, then they will need to assemble since they check clearances while assembling.

Probably the easiest solution is to tell us precisely what you have and what you want concerning checking things, parts that are added, etc.

MrSoutherland
Posts: 263
Joined: Sat Oct 03, 2009 4:44 am
Car: S13 - Sr20

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I understand p&p is not rebuilding. I also understand the block is reffered as the botton end.

So lets say I get a crank kit then and have them assemble for me, with new acl bearings and clean up the bottom end for me. Port the head and call it a day. What should one expect to pay?

As to the question you asked, Yes.

WizardBlack
Posts: 99
Joined: Wed Sep 19, 2007 5:35 pm
Car: 1977 Datsun 280Z w/ RB25DET

Post

MrSoutherland wrote:I understand p&p is not rebuilding. I also understand the block is reffered as the botton end.

So lets say I get a crank kit then and have them assemble for me, with new acl bearings and clean up the bottom end for me. Port the head and call it a day. What should one expect to pay?

As to the question you asked, Yes.
Someone in your area will have to answer that, but it's probably around 1k~1.5k with headwork. A lot of it depends on how far they go with the head. Saying you have headwork is like saying you have mods. Lots of variation, I suppose. I would definitely shop around since some shops are really high for no apparent reason. I would recommend having the block done locally (due to practicality) and check the SR20 forums for a competent SR20 head guy to ship the head to. When I used to run a speed shop, I outsourced headwork to the specialists/artists in their area. 4G63 heads went from my location in Ohio to Tulsa, OK.With a crank kit you will need a more substantial amount of balance work.

I would do this:You disassembleThey:Hot tank all partsInspect all partsPressure test headClean up bearing surfacesCheck and re-true blockCheck and re-true headStreet port with new seals and valve jobClean up bearing surfaces on blockRe-balance for new (if any) hard partsEstablish proper clearances for race bearings with a street/strip clearance in mind (if they are capable of deviating from factory specs)

You:Check all their workUse compressed air and multiple cans of brake parts cleaner to blow out all journals and nooks/cranny'sassemble valvetrain and head to block and time it up

Bear in mind that a machine shop visit is like a mud 'bath' is to a person. You need copious amounts of cleaning after it's over; even if things are 'better'. ;-)Don't try to snap pics, throw it together and go boost the @#$* out of it.

Your first thing should be to stop in (not phone call) and talk to someone there. Tell them what you have and what you're after. What you use it for, etc. That will tell you who you might trust and who you think is just patronizing you for your money. Establish timelines, as well. They don't call it machine shop jail for nothing. Take what they tell you; double it and then add a week. You don't want to get pushy with them. That'd be like telling your tuner 'to hurry up and finish already!'.

Hope that helps,Mark

MrSoutherland
Posts: 263
Joined: Sat Oct 03, 2009 4:44 am
Car: S13 - Sr20

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Mr Wizardblack, Thank you so very much for all of that. It will help me tremendously! That cleared everything up with machining for me and now I have my goals all written down. Copy and pasted in my documents! I'm sure this will help others as well that aren't familiar with this step.

Thank You!


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