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how exactly do you build a 302 into a 306?

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Old 02-17-2008, 01:00 AM   #1
93StreetFox
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Default how exactly do you build a 302 into a 306?

i was just wonderin if there was any machine work involved, i've never messed with the bottom end at all
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Old 02-17-2008, 01:08 AM   #2
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Default RE: how exactly do you build a 302 into a 306?

its machine work, more specifically they bore out the cylinders 0.030in
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Old 02-17-2008, 01:53 AM   #3
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Default RE: how exactly do you build a 302 into a 306?

thats what i figured, you mind as well go 347
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carbed h/c/i 302/c4. bbk springs, 4.10's. black on black


88 notch,

351c powered. couldnt fit my aftermarkets in the sig : /


selling 351w shortblock. 10:1 probe forged pistons, .030 over. edelbrock performer rpm cam


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Old 02-17-2008, 01:54 AM   #4
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Default RE: how exactly do you build a 302 into a 306?

well that means increasing the stroke.
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Old 02-17-2008, 01:58 AM   #5
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Default RE: how exactly do you build a 302 into a 306?

yeah i would go with the 30 over. you cant really go to big with the stock production blocks. the get weaker the more you go.
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Old 02-17-2008, 02:12 AM   #6
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Default RE: how exactly do you build a 302 into a 306?

i just got my 306 runnin finally i have an idle video of it in general discussion
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Old 02-17-2008, 08:57 AM   #7
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Default RE: how exactly do you build a 302 into a 306?

Just want to point out that there is no power gains to be had by boring .030. It is done to true the cyclinder walls and make sure the rings have a good surface to seal agaist.
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Old 02-17-2008, 09:54 AM   #8
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Default RE: how exactly do you build a 302 into a 306?

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Just want to point out that there is no power gains to be had by boring .030. It is done to true the cyclinder walls and make sure the rings have a good surface to seal agaist.
what do you mean by the rings have a good surface to seal agaist?

so with the stock 302 isent good? and the 306 is more stable?

im unsure of your meaning in this.
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Old 02-17-2008, 10:02 AM   #9
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Default RE: how exactly do you build a 302 into a 306?

When an engine gets old the cyclinders wear and go out of round or havea taper worn into them. Boring the cyclinder will true it up and allow the rings to seal better. Boring is not generally done to increase displacment, you realisicly don't get much of an increase in engine size (.030 is only 4 cubinc inches on a 302) so you not getting much power from 4 cubes.
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Old 02-17-2008, 10:11 AM   #10
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Default RE: how exactly do you build a 302 into a 306?

go for .40 over then to a 308
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Old 02-17-2008, 10:22 AM   #11
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Default RE: how exactly do you build a 302 into a 306?

see thats one of my issues. (not trying to highjack)

the guy i got the car from, was a very old man, very cool, and down to earth, collects cars basically to look at them.
and he told me that the engine was freshly "rebuilt" so does that mean its a 306 now? or is it possible to keep it a 302.


and most likly ill have to disassemble the hole engine to figure out what it really is right?
(i trust the guy that it was re-built, but it was hard to get any info out of him, as he was about 78yrs old, and repeated himself alot)
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Old 02-17-2008, 11:01 AM   #12
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Default RE: how exactly do you build a 302 into a 306?

yea its possible to say its rebuilt and still be a 302, he could have done a h/c/i swap, which i gusse means its rebuilt.
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Old 02-17-2008, 11:15 AM   #13
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Default RE: how exactly do you build a 302 into a 306?

This is one of those threads that just makes me say....

Hit the search button buddy! It is your friend. You treat it well and it will treat you even better....


Thats all I have to say.
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Old 02-17-2008, 11:43 AM   #14
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Default RE: how exactly do you build a 302 into a 306?

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yea its possible to say its rebuilt and still be a 302, he could have done a h/c/i swap, which i gusse means its rebuilt.
well it has cobra valve covers(maybe heads? who knows), and the car has the stock gears(2.73's), but has some wicked top end rush, but its not to crazy.

idk, imma get it dynoed, then do gears, then go from there.

prob a tear down during the summer, becase ill be riding my motorcycle alot, and ill go from there
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Old 02-17-2008, 03:29 PM   #15
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Default RE: how exactly do you build a 302 into a 306?

my block's bored 30 over... you will need machine work line hone, bore, you might as well deck the block if you have it there... it really doesn't make that big a difference i suggest considering forged pistons if your pulling it apart
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Old 02-17-2008, 04:42 PM   #16
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Default RE: how exactly do you build a 302 into a 306?

why pull it apart guys??? if it runs fine leave it alone!!1 if it ain't broke don't fix it!!! take it to the track,,,, the 1/4 time and mph will indicate how stock it is!!! = done end of discussion
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Old 02-17-2008, 07:30 PM   #17
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Default RE: how exactly do you build a 302 into a 306?

If you want to know what has been done, pull a head off. If pistons tops are pretty dirty and do not have a .030 on them it is a 302 still. Lots of people claim their car has a fresh 302 in it, probably half of them actually do. I picked up a 302 awhile ago for nothing, it was just a stock 1989 mustang motor, tore it apart, cylinder bores were still nice, just needed a light hone and I rebuilt it completely. It is still a 302 and a very nice motor sitting in my garage, it is for sale to but thats another story. As far as boring a block I'm conservative. SBFs I will go .030 over, thats it, no more. If needed I'll go get another block, they are cheap.

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Old 02-17-2008, 11:42 PM   #18
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Default RE: how exactly do you build a 302 into a 306?

A 302 is the stock stroke (3.0") and stock rods (5.090"), but the bore is bored, then finished honed .030".

This increases the cubes by roughly 4 cubic inches.

It increases compression slightly, and unshrouds the valve slightly. It is an opportunity to throw in larger valve reliefs and a slightly larger piston.

Stroking is where the power is at.
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Old 02-18-2008, 11:22 AM   #19
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Default RE: how exactly do you build a 302 into a 306?

listen to mjr' he's the ****.... also, its not worth it unless its a 351 or a cobra jet motor.....your better off stroking ur current motor...
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Old 02-18-2008, 05:36 PM   #20
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Default RE: how exactly do you build a 302 into a 306?

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ORIGINAL: mjr46

why pull it apart guys??? if it runs fine leave it alone!!1 if it ain't broke don't fix it!!! take it to the track,,,, the 1/4 time and mph will indicate how stock it is!!! = done end of discussion
lol, i like your thinkin!

sooooo lets say 89 lx vert, automatic, at 5300 ft above sea level.
minor bolt ons.............. whatta ya think it will/should run with this :

professional products typhoon intake, 70mm bbk throttle body, and spacer, stock mass air sensor, bbk cold air intake, light weight pulleys, 3point strut bar on towers and firewall, cobra heads (or valve covers?) chrome EVERYTHING under the hood (including thouse expsive radiator hoses) aftermarket aluminum radiator, aluminum drive shaft(not confermed yet), shift kit, and "internal work" said this one shop that clamed they did $2000 in work to the AOD tranny. weld racing drag light weight wheels, bf goodrich radial t/a's rubber. rebuilt engine, and im sure im forgetting a few things
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Old 02-18-2008, 05:36 PM
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