Exactly What Makes A "306"

matt0114 · October 25th, 2007, 10:47 AM

I just got my a mustang yesterday and the guy said it has a "306" i know obviously the GT's came with a 302, but why would you bore it out to just a 306? im guessing, (im coming here for a better answer) that the engine was rebuilt and bored (how much) for some reason? pls help, i just want to know why.

jam77 · October 25th, 2007, 11:18 AM

a 306 is a 302 thats been bored .30 over

BROKINARROW · October 25th, 2007, 11:40 AM

more power and better performance with the right setup

matt0114 · October 25th, 2007, 11:47 AM

mmm.... more power

explain this good setup pls

as far as i know the motor itself is stock: don't you just hate it when the person you buy the car from doesn't know much about whats been done to it

83five0 · October 25th, 2007, 01:09 PM

more than likely it was just rebuilt and when you rebuild a motor typically its bored over. its just like re assuring the rings will seal correctly because there could be tiny scratches or somethin if it isnt rebored

Iwannagofast · October 25th, 2007, 01:14 PM

boring an engine doesnt make a whole lot of extra cubic inches.....with a big block you would see a lot bigger difference with the same amount of bore because it gona be a type of exponential increase.....but even then its not a huge gain in cubes

Speedstang302 · October 25th, 2007, 04:45 PM

boring to a 306 makes no real power. its about 1.5hp per cubic in. making it have 6hp more than it had as a 306..so for $500 not worth it...now its is worth it when you add supporting mods and is an almost must have of stroking an engine..when rebuilding it is usual that is isnt bored out..just rebuilt, the boring will make block fresher..so unless you are doing more work to it, you're going to be slower than a 302 w/ underdrive pullys!!!

also ask previous owner for paper work on this..cuz ALOT of people say stuffs be done that cant be seen by the eye immediatly and its NEVER been done!!!

forst1 · October 30th, 2007, 01:01 AM

102 x 3 =

Drick · October 30th, 2007, 01:16 AM

Not even worth it to change your motor to a 306. Why might you ask because your going to have to buy new pistons anyway. You should just go straight for a stroker like a 331 or 347 because you will already have the engine completley apart and you should just go the rest of the way to make it have just that much more power

Speedstang302 · October 30th, 2007, 10:43 AM

Originally Posted by forst1

102 x 3 =

wow...your useless

Speedstang302 · October 30th, 2007, 10:45 AM

Originally Posted by 8t6gt

Not even worth it to change your motor to a 306. Why might you ask because your going to have to buy new pistons anyway. You should just go straight for a stroker like a 331 or 347 because you will already have the engine completley apart and you should just go the rest of the way to make it have just that much more power

+1...im thinking bout taking an 302 block that i have laying around, and having it bored .30 over and a buddy of mine has a complete scat 347 stroker bottem end for $600 new..and possibly put it in the mustang..except i dont have money to do TFS top end yet..

1slo5.0 · October 30th, 2007, 12:03 PM

The only time boring an engine should be done is when the cylinders are worn.

Speedstang302 · October 30th, 2007, 04:30 PM

Originally Posted by Darrell

The only time boring an engine should be done is when the cylinders are worn.

umm...what about stroking?

Drick · October 30th, 2007, 04:32 PM

Originally Posted by Darrell

The only time boring an engine should be done is when the cylinders are worn.

+1 except when stroking

1slo5.0 · October 31st, 2007, 01:21 PM

Originally Posted by Speedstang302

umm...what about stroking?

What about stroking?

Speedstang302 · November 1st, 2007, 10:25 AM

Originally Posted by Darrell

Originally Posted by Speedstang302

umm...what about stroking?

What about stroking?

boring it..you said you rlly never have to bore an engine unless the cylinder walls need it..about 90% of strokers are bore out!!!

1slo5.0 · November 1st, 2007, 12:15 PM

Originally Posted by Speedstang302

boring it..you said you rlly never have to bore an engine unless the cylinder walls need it..about 90% of strokers are bore out!!!

And why is that? Because 90% of them are used engine blocks. If you started with a fresh block all you would need is final finishing on the cylinders.

5.0 cobra · November 1st, 2007, 12:59 PM

but alot of people don't have a fresh block to start with because they dont have the know how or the money.but why would you bore it to .30 jus to make it a 306.

1slo5.0 · November 1st, 2007, 02:14 PM

Originally Posted by 5.0 cobra

but alot of people don't have a fresh block to start with because they dont have the know how or the money.but why would you bore it to .30 jus to make it a 306.

And that goes back to worn cylinders. If you are tearing down a used block to put a longer stroke crank in, etc. you might as well spend the extra $150 to have it bored to clean up the cylinders.

But yeah, boring an engine to add a few cubic inches is a waste.

Speedstang302 · November 1st, 2007, 04:19 PM

Originally Posted by Darrell

Originally Posted by Speedstang302

boring it..you said you rlly never have to bore an engine unless the cylinder walls need it..about 90% of strokers are bore out!!!

And why is that? Because 90% of them are used engine blocks. If you started with a fresh block all you would need is final finishing on the cylinders.

OK..you have to bore out the block to make a 331, 347, 393,408 ect...you could stroke a motor w/ out boring it, then why does CHP, DSS bore all there new blocks?

October 25th, 2007, 10:47 AM	#1
matt0114 Regular 1985 Mustang GT 14.72 @ 93.84 Join Date: Aug 2005 Location: Fountain, NC Posts: 108 iTrader: 0 reviews	Exactly What Makes A "306" I just got my a mustang yesterday and the guy said it has a "306" i know obviously the GT's came with a 302, but why would you bore it out to just a 306? im guessing, (im coming here for a better answer) that the engine was rebuilt and bored (how much) for some reason? pls help, i just want to know why.

October 25th, 2007, 11:18 AM	#2
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685 iTrader: 0 reviews	Exactly what makes a "306" a 306 is a 302 thats been bored .30 over __________________ 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.

October 25th, 2007, 11:40 AM	#3
BROKINARROW Regular soon to be fox body Join Date: Sep 2007 Location: Raleigh NC Posts: 164 iTrader: 0 reviews	more power and better performance with the right setup __________________ starting from scratch

October 25th, 2007, 01:09 PM	#5
83five0 Regular 1983 GT UNKNOWN Join Date: Oct 2006 Location: MEMPHIS,TN Posts: 126 iTrader: 0 reviews	more than likely it was just rebuilt and when you rebuild a motor typically its bored over. its just like re assuring the rings will seal correctly because there could be tiny scratches or somethin if it isnt rebored __________________ 1983 FOX BODY-LIL SOMTHIN IN PROGRESS

October 25th, 2007, 04:45 PM	#7
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,799 iTrader: 1 reviews	boring to a 306 makes no real power. its about 1.5hp per cubic in. making it have 6hp more than it had as a 306..so for $500 not worth it...now its is worth it when you add supporting mods and is an almost must have of stroking an engine..when rebuilding it is usual that is isnt bored out..just rebuilt, the boring will make block fresher..so unless you are doing more work to it, you're going to be slower than a 302 w/ underdrive pullys!!! also ask previous owner for paper work on this..cuz ALOT of people say stuffs be done that cant be seen by the eye immediatly and its NEVER been done!!! __________________ 1990 GT- 5.0L \|BBK Shortys\|VRS O/R X\| SLP LM1 Catback\|BBK CAI\| Centerforce Clutch\|MGW Short Throw\| Alum D/S\| 3.73's\| Steeda Springs...about as stock as a 5.0 comes now a days..much more to come

October 25th, 2007, 11:47 AM	#4
matt0114 Regular 1985 Mustang GT 14.72 @ 93.84 Join Date: Aug 2005 Location: Fountain, NC Posts: 108 iTrader: 0 reviews	mmm.... more power explain this good setup pls as far as i know the motor itself is stock: don't you just hate it when the person you buy the car from doesn't know much about whats been done to it

October 30th, 2007, 01:01 AM	#8
forst1 Newbie Join Date: Jul 2007 Posts: 40 iTrader: 0 reviews	102 x 3 =

October 30th, 2007, 01:16 AM	#9
Drick Big timin' in a small town 2004 FX4 F150, 86 GT Join Date: Apr 2007 Location: Gods country. Nordern Michigan eh Posts: 14,365 iTrader: 1 reviews	Not even worth it to change your motor to a 306. Why might you ask because your going to have to buy new pistons anyway. You should just go straight for a stroker like a 331 or 347 because you will already have the engine completley apart and you should just go the rest of the way to make it have just that much more power __________________ FX4 Crew Crew member #1 Don't take anything I say to heart, I don't try to come off as an asshole. It just happens

October 30th, 2007, 12:03 PM	#12
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	The only time boring an engine should be done is when the cylinders are worn. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

November 1st, 2007, 12:59 PM	#18
5.0 cobra Newbie Join Date: Oct 2007 Posts: 10 iTrader: 0 reviews	but alot of people don't have a fresh block to start with because they dont have the know how or the money.but why would you bore it to .30 jus to make it a 306. __________________ GO FAST.... or be a tuner

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Exactly What Makes A "306"

Exactly What Makes A "306"

Exactly what makes a "306"