Is boring .30 over worth the money

wolverine8490 · June 17th, 2007, 05:05 PM

I am going to drop off my 302 to the machine shop on Tuesday this week. Is it worth $140.00 to bore the block out .30 over if it does not need to be bored? Is the power increase worth it?

Tony_90fox · June 17th, 2007, 05:09 PM

I couldnt notice any "power" from it, but it is a good choice for 100,000+ mile motors, and will be a nice clean up for it...I would do it, but of course you need different pistons after boring.

wolverine8490 · June 17th, 2007, 05:14 PM

Yeah, I have a block from a Mountaineer, and it is in great shape. I dont know how many miles are on it, but you can still see the cross hatch from the original boring. There is no lip that needs to be reamed out. So I "think" I could go with factory pistons. I am using new pistons no matter what I do. I just want to see if the $$$ - HP would be worth it.

usmcsawgunner · June 17th, 2007, 05:44 PM

if your block is good i wouldnt do it

P.O.S-GT · June 17th, 2007, 05:46 PM

boring the block is not to give you more power , it is to clean up the bores. so if you could get away with a dash hone then thats what i would do. because later on the block can be bored over if needed without going too far into the walls.

Drick · June 17th, 2007, 07:19 PM

If the block is still good dont bore because anything can happen and if you dont leave any play room in the cylinder walls you could wnd up buying a new block if something were to happen

1slo5.0 · June 17th, 2007, 09:08 PM

Originally Posted by wolverine8490

I am going to drop off my 302 to the machine shop on Tuesday this week. Is it worth $140.00 to bore the block out .30 over if it does not need to be bored? Is the power increase worth it?

If it doesn't need to be bored than no, it is not worth it. Like someone else mentioned boring a stock block is for cleaning the cylinders up. If the engine has alot of miles on it and has worn cylinders it can be noticeable because the cylinders will seal again.

wolverine8490 · June 17th, 2007, 10:42 PM

Awesome, thanks for the info. Not only that, but it will save me 140 bucks

. I am still going to get them to check it out, and if they feel they need to bore, then thats cool. But it looks and feels to be in awesome shape.

jam77 · June 18th, 2007, 01:39 AM

the machine shop will be able to measure the cylinders and see how worn they are with a bore gauge. If they hone it and it doesnt clean up i would bore it you can usually go as small as 20 over and as high as 60. i would not get cheap at this point if it's even slightly questionable id bore it

HACKGT350 · June 18th, 2007, 09:32 AM

sounds like all you need to do is get it honed out unless there is some actual scarring in the walls. if not your wasting your money

mustangboy8909 · June 19th, 2007, 12:40 AM

yeah i was thinking about doing the same thing but then i changed my mind and am going to buy a 351 and put a strocker kit in it picked up the motor today going to stroke it out to a 406 ci

HACKGT350 · June 19th, 2007, 04:25 PM

Originally Posted by mustangboy8909

yeah i was thinking about doing the same thing but then i changed my mind and am going to buy a 351 and put a strocker kit in it picked up the motor today going to stroke it out to a 406 ci

dont you mean 408?

lugnutz08 · November 5th, 2007, 04:06 PM

IM NO PRO BUT BORING OVER DOES UNSHROUD THE VALVES WHICH=MORE HP,REALLY PROBABLY NOT NOTICABLE,DEPENDING. IF ITS STOCK ID SAY JUST CLEAN IT UP, IF YOU HAVE HEADS AND CAM BORE IT,BUT LIKE MENTIONED DONT BORE TOO MUCH,....JUST MY STUPID OPINION...LOL

1slo5.0 · November 5th, 2007, 04:41 PM

Originally Posted by lugnutz08

IM NO PRO BUT BORING OVER DOES UNSHROUD THE VALVES WHICH=MORE HP,REALLY PROBABLY NOT NOTICABLE,DEPENDING. IF ITS STOCK ID SAY JUST CLEAN IT UP, IF YOU HAVE HEADS AND CAM BORE IT,BUT LIKE MENTIONED DONT BORE TOO MUCH,....JUST MY STUPID OPINION...LOL

That is true to a point but just a .030 bore won't net you anything. Going from a 4.00 bore to a 4.125 bore could net some results though.

Drick · November 5th, 2007, 04:43 PM

Originally Posted by lugnutz08

IM NO PRO BUT BORING OVER DOES UNSHROUD THE VALVES WHICH=MORE HP,REALLY PROBABLY NOT NOTICABLE,DEPENDING. IF ITS STOCK ID SAY JUST CLEAN IT UP, IF YOU HAVE HEADS AND CAM BORE IT,BUT LIKE MENTIONED DONT BORE TOO MUCH,....JUST MY STUPID OPINION...LOL

Nicley said but turn the caps off

lugnutz08 · November 5th, 2007, 04:52 PM

k sorry bout the caps,have to do it at work...lol,but yes darell unshrouding even .30 does help airflow,not noticable on a stock motor tho.Hey Darell,whats up with 41?

Drick · November 5th, 2007, 04:53 PM

Originally Posted by lugnutz08

k sorry bout the caps,have to do it at work...lol,but yes darell unshrouding even .30 does help airflow,not noticable on a stock motor tho.Hey Darell,whats up with 41?

Yes you wont noitice anything lol. I hate it when at work you have to use caps been there done that

00vabchgt · November 5th, 2007, 06:14 PM

i'm having my block bored 0.020" over when it gets rebuilt next week. it's got over 100k miles on it, and it's really just to clean the cylinder walls up some. i actually did the math, just out of curiosity and found that boring 0.020" over will net me about a whopping 2 hp while bumping the compression ratio from 9.7:1 to 9.8:1. i imagine going 0.030" over wouldn't be more significant than 0.020" over...

Overkill · November 5th, 2007, 07:05 PM

You'll definitely get more out of higher compression pistons than boring .030 over. Just boring it won't do squat performance-wise. You just do it so you don't have to buy a new block at re-build time and then you only do as much as necessary to make the cylinders round and straight without scoring. I wouldn't bore that block unless the cylinders are out-of-round or something. Just cross-hatch them. Save boring for after you try to re-use the wrist pin retainers.

Aren't there ten over pistons available?

Vinyl66 · November 5th, 2007, 07:28 PM

not sure but don't most 347 stroker kits require the block to be bored .030?

June 17th, 2007, 05:05 PM	#1
wolverine8490 Newbie Join Date: Jun 2007 Posts: 34	Is boring .30 over worth the money I am going to drop off my 302 to the machine shop on Tuesday this week. Is it worth $140.00 to bore the block out .30 over if it does not need to be bored? Is the power increase worth it?

June 17th, 2007, 05:46 PM	#5
P.O.S-GT Regular Join Date: Feb 2007 Location: phoenix az Posts: 54	boring the block is not to give you more power , it is to clean up the bores. so if you could get away with a dash hone then thats what i would do. because later on the block can be bored over if needed without going too far into the walls. __________________ 1990 GT HATCH trw pistons/351 heads with all the goodies schneider 260 cam/8.8 posi w/4:10's 1/4 mile unknown??? cause she wont start

June 17th, 2007, 07:19 PM	#6
Drick Chicken Plucker 2003 GT Join Date: Apr 2007 Location: Northern FL otherwise known as Jacksonville Posts: 7,686	If the block is still good dont bore because anything can happen and if you dont leave any play room in the cylinder walls you could wnd up buying a new block if something were to happen __________________ Military Crew ADAA Modular Mustangs are two damn confusing Crew Member #1 Founder

June 18th, 2007, 01:39 AM	#9
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685	Is boring .30 over worth the money the machine shop will be able to measure the cylinders and see how worn they are with a bore gauge. If they hone it and it doesnt clean up i would bore it you can usually go as small as 20 over and as high as 60. i would not get cheap at this point if it's even slightly questionable id bore it __________________ 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.

June 19th, 2007, 12:40 AM	#11
mustangboy8909 Regular Join Date: Feb 2007 Posts: 107	thining about doing the same thing yeah i was thinking about doing the same thing but then i changed my mind and am going to buy a 351 and put a strocker kit in it picked up the motor today going to stroke it out to a 406 ci

Is boring .30 over worth the money

Is boring .30 over worth the money

Re: Is boring .30 over worth the money

Is boring .30 over worth the money

thining about doing the same thing

Re: thining about doing the same thing

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June 17th, 2007, 05:09 PM	#2
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,833	I couldnt notice any "power" from it, but it is a good choice for 100,000+ mile motors, and will be a nice clean up for it...I would do it, but of course you need different pistons after boring.

June 17th, 2007, 05:14 PM	#3
wolverine8490 Newbie Join Date: Jun 2007 Posts: 34	Yeah, I have a block from a Mountaineer, and it is in great shape. I dont know how many miles are on it, but you can still see the cross hatch from the original boring. There is no lip that needs to be reamed out. So I "think" I could go with factory pistons. I am using new pistons no matter what I do. I just want to see if the $$$ - HP would be worth it.

June 17th, 2007, 05:44 PM	#4
usmcsawgunner Regular 1993 Mustang GT 13.2 @98.54 Join Date: Apr 2007 Location: Kaneohe Bay, Hawaii Posts: 433	if your block is good i wouldnt do it

June 17th, 2007, 10:42 PM	#8
wolverine8490 Newbie Join Date: Jun 2007 Posts: 34	Awesome, thanks for the info. Not only that, but it will save me 140 bucks . I am still going to get them to check it out, and if they feel they need to bore, then thats cool. But it looks and feels to be in awesome shape.

June 18th, 2007, 09:32 AM	#10
HACKGT350 Regular Join Date: Apr 2007 Posts: 81	sounds like all you need to do is get it honed out unless there is some actual scarring in the walls. if not your wasting your money

November 5th, 2007, 04:06 PM	#13
lugnutz08 Regular Join Date: Nov 2007 Location: CHICAGO Posts: 64	IM NO PRO BUT BORING OVER DOES UNSHROUD THE VALVES WHICH=MORE HP,REALLY PROBABLY NOT NOTICABLE,DEPENDING. IF ITS STOCK ID SAY JUST CLEAN IT UP, IF YOU HAVE HEADS AND CAM BORE IT,BUT LIKE MENTIONED DONT BORE TOO MUCH,....JUST MY STUPID OPINION...LOL

November 5th, 2007, 04:52 PM	#16
lugnutz08 Regular Join Date: Nov 2007 Location: CHICAGO Posts: 64	k sorry bout the caps,have to do it at work...lol,but yes darell unshrouding even .30 does help airflow,not noticable on a stock motor tho.Hey Darell,whats up with 41? __________________ RUN WHAT YA BRUNG,HOPEFULLY DONT TOW IT HOME 93 GT AOD(SLUSHBOX)HA HA 3.73,TSI TRANZ,306,BENNETT HEADS AND CAM,ALUM SHAFT...BLAH BLAH BLAH

November 5th, 2007, 07:05 PM	#19
Overkill Newbie Join Date: Oct 2007 Location: The Batcave, Southern Command, Durham, NC Posts: 29	You'll definitely get more out of higher compression pistons than boring .030 over. Just boring it won't do squat performance-wise. You just do it so you don't have to buy a new block at re-build time and then you only do as much as necessary to make the cylinders round and straight without scoring. I wouldn't bore that block unless the cylinders are out-of-round or something. Just cross-hatch them. Save boring for after you try to re-use the wrist pin retainers. Aren't there ten over pistons available? __________________ 1986 Mustang GT

November 5th, 2007, 07:28 PM	#20
Vinyl66 Undisputed Champion of MM 1966 Vinyl Mustang 06 Dodge Ram 1500 Join Date: Sep 2007 Posts: 2,016	not sure but don't most 347 stroker kits require the block to be bored .030? __________________ Pittsburgh Steelers/Penguins/Pirates FTMFW!!!!! Pittsburgh City of Champions!!!!! 1966 Ford Mustang w/ Black Vinyl top 2006 Dodge Ram 1500 Quad Cab 4X4 5.7L Hemi (New Exhaust ETA: Installed!) Mods listed in Garage

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