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Drag Racing Forum

Drag Racing | Road Racing | Drift Racing | Timeslips | Power Adders | Mustang Tech 
 

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Unread 10-11-2002   #1 (permalink)
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Default How much does a 30 over bore cost?

What is the general price to get a 302 block bored over 30? I'm just trying to decide if i should just get a new block or get mine bored...summit has 5.0 blocks for $300.... ohh how much does it cost to fill a 10lb nitrious bottle?
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Unread 10-11-2002   #2 (permalink)
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just the .030 over? Ive seen someone get away with it for $150. but the machine shop didnt order any parts and the installation was done by the customer.
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Unread 10-11-2002   #3 (permalink)
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Around 50$ per cylinder where I come from. And nitrous is approx $80/bottle.
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Unread 10-11-2002   #4 (permalink)
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150 isnt too bad.. i'm going to do all the work.. well my dad and I...
Do you think i should go more than 30? cuz i was just gonna leave it... but now i figure.. i better freshen it up before i put the heads and intake on it.. seeing how its got 97,000 miles on it.. i was gona just order a rebuild kit from SummitRacing should i go with hypernumatic pistons or Forged? plus what would be the best compression ratio.. if say in a year or to i want to super charge it... but i'm not sure if i can do that... dont know if i got the room for it... beeing the odd ball with the EFI 67 makes things harder for me...
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Unread 10-11-2002   #5 (permalink)
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If Jarrett is counting in that fake Canadian money again, $400 is really 30 cents... doh! I mean $250 American.
If you want to just freshen the engine, you can just hone the cylinders... or go out .010 over.. that way you got more block for next time. I wouldnt go over .030 regardless, you'll be too thin after that, heat becomes an issue, and boost can only worsen it.
If you'll be running boost, I say go with forged... cant hurt.
Also for boost, id run the 9.75:1 ratio over the 11.61:1, less compression + more boost.
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Unread 10-11-2002   #6 (permalink)
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9.75:1 isnt that low.. i should still have decent HP with out the blower right? and then when i get it.. i will have big gains...?
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Unread 10-11-2002   #7 (permalink)
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yeah you will still have gains... a 95 with forged only has around 10.13:1. Plus heads can change it... but when building power, its good to be able to run more boost. Just make sure the bottom end can take the more boost that you put in.
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Unread 10-11-2002   #8 (permalink)
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i suppose you would happen to know off the top of your head how i would figure out what size pistons i would need to get with holley system Max II heads to get 9.75 to 1 ratio? Are summits kits ok to use? or are the pistons really crappy? and if i get forged pistions.. does that mean i need to get forged connecting rods too then?
and a new crank? where to i draw the line.. ? i want good power.. but dont want to spend more than i have too...
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Unread 10-11-2002   #9 (permalink)
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Forged pistons can be used on the stock crank and rods, that's the way the pre 93's came from the factory.
The stock crank and rods will live to the power capabilities of the block, which is about 600 hp before it will crack. Just use good fasteners for the rod bolts, and main nolts and it will be fine.
Oh and $400 Can = $247 American.
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Unread 10-11-2002   #10 (permalink)
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What are some good fasteners? Do you recommend any? What separates good from bad?
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Unread 10-11-2002   #11 (permalink)
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ARP rod bolts and main studs. You will have to reaize the connecting rod big end to have them installed as well.
Tensile strength determines their quality. The 302 only has 5/16" rod bolts, and they stretch. Expecially when you consider the piston has a weight of about 7000 lbs at redline.
The ARP bolt will stand up to that much better than the stocker.
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Unread 10-11-2002   #12 (permalink)
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WOW... thanks for the input on that.. i never knew it was that much pressure.. but it makes sense....
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Unread 10-11-2002   #13 (permalink)
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get ARP rod bolts for a minimum
stock mains are OK if ur not gonna boost it
if u are id recomed getting the ARPs for the mains AND head bolts
9.75/1 is a little too high to be streetable for boost (I.M.H.O.)N/A would be fine with that compression but ud still have to run decent gas or no timing
summits stuff is great if i was u id spend the coin on the forged pistons
i just bought a re-ring kit from them for my 88 and i was really pleased with everything

repeat customers and word of mouth are everything to them and so far ive spent about 8 grand with them (stretched over a few years)and have always been really pleased with the service and everything

G/L scott
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Unread 10-11-2002   #14 (permalink)
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X1, I came up with the 9.75:1 ratio from Summit, they have the rebuild kits, and thats the ratio for Forged with stock heads.. Its not like thats the desired compression. use the forged pistons and the Holley heads, youll be just fine.
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Unread 10-12-2002   #15 (permalink)
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To refill an N2O bottle averages $3.50 per pound or $35.00 for a full 10 pound bottle. (Jarrett...I would be more than happy to fill your bottles. Will only charge you $70.00). If you decide to go .030 over on the block, you will also need .030 over pistons (if you want to go SC you need new Forged slugs anyway, figure $450.00). For a machine shop to bore your block it will be hot tanked $75.00, magged $75.00, line bored $60.00, they will check the deck $50.00, polish the crank or go .010/.010 grind on the crank $75.00-$100.00. New rings $100.00, bearings $50.00, gaskets $75.00, ARP rod bolts are $45.00, ARP main studs are $50.00, fresh fluids $50.00. Figure $450.00 to $500.00 for the machine shop work. If SC try to keep the CR at about 8.0 or 8.5/1. If you go nitrous CR is not as critical, as long as you use the right octane rated fuel, keeping in mind that those bottles will need to be refilled. To lower cost I invested in my own refill station for $350.00, but my cost per pound is about $1.95 as compared to $3.50. It was paid for after 10 weekends.

Ron
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