How Do I Tell If I Have A 331 Or 306? - Northern California Ford Owners

This is topic How Do I Tell If I Have A 331 Or 306? in forum Tech Talk at Northern California Ford Owners .

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Posted by PopTheHood (Member # 7040) on :

I just recived a shortblock that i purchased. On the reciept it says that i ordered a 306. I opened the package and started checking out the motor. Its totaly wrapped in plastic and on the side there is a tag that says that it is a 331 stroker. do you think they sent the wrong shortblock? or is the labeling of the block wrong? how do i tell the difference between the two? If they sent me a 331 instead of a 306 im not complaining. [Big Grin]

that would be awesome.

Posted by AJBlackGT (Member # 3936) on :

Measure how far down the piston travels in the bore. A 306 will be 3" and a 331 will be 3.25".

Posted by PopTheHood (Member # 7040) on :

all right thanks. what are the advantages and disadvantages if it is a 331? would twisted wedge heads and a stage 1 cam be ok on that motor? thats what i got cuz i was expecting a 306.

Posted by PopTheHood (Member # 7040) on :

the bore on the cylinders is right about 4 inches and the stroke travels right about 3.25 inches.

Posted by Sk8OnGlass (Member # 6370) on :

so you got a 331 ... (nice )

Posted by AJBlackGT (Member # 3936) on :

quote:
Originally posted by PopTheHood:
the bore on the cylinders is right about 4 inches and the stroke travels right about 3.25 inches.

If you measurements are correct it's a 331. Can you see a part number on the crank?
The heads will be alright, cam a little on the small side, but it will work.
edit: where did you buy it from? Are you sure you didnt pay for a 331, and it sent with the wrong receipt or something?

[ December 13, 2006, 05:05 PM: Message edited by: AJBlackGT ]

Posted by PopTheHood (Member # 7040) on :

Dss racing. I bought a pro bullet 306 for $2,219. on the reciept it says 306 pro bullet. on the wrapping the block came in it says 331 pro bullet.

Posted by CMELEVU (Member # 2563) on :

Sounds like you scored. Turn the block over and see if the cyl walls are clearenced for the longer stroke.

Posted by 8850GT (Member # 5909) on :

damn...thats a come up!!! niiice....

Posted by PopTheHood (Member # 7040) on :

5.0Stroker written on the main support system

Depth of the stroke

size of the bore/piston

Windage tray

Pistons

Motor 1

Motor 2

Motor 3

Posted by 92stangLX (Member # 3252) on :

quote:
Originally posted by PopTheHood:
all right thanks. what are the advantages and disadvantages if it is a 331? would twisted wedge heads and a stage 1 cam be ok on that motor? thats what i got cuz i was expecting a 306.

The advantage is more torque. There are really no disadvantages if it is built right except for the slightly extra cost. You should make pretty good power with those heads and cam.

Posted by kingmoochr (Member # 5834) on :

check valve clearance, you might need more with those pistons

Posted by 88bird (Member # 1424) on :

Don't forget, most likly your gonna need a 28oz balancer and flywheel.

The 50oz stuff may not work (depending how it was balanced)

Posted by JBeezy53 (Member # 3960) on :

You must have been a good boy this year! [Big Grin]

Posted by v-town coupe (Member # 2771) on :

quote:
Originally posted by PopTheHood:
Dss racing. I bought a pro bullet 306 for $2,219. on the reciept it says 306 pro bullet. on the wrapping the block came in it says 331 pro bullet.

looks like im calling dss today and ordering a 306 and hopefully my 347 will be here next week!!!

good deal u lucked out run it!! [patriot]

Posted by PopTheHood (Member # 7040) on :

Hey V-town, you from Vallejo? what you drive? i might have seen you around.

Posted by v-town coupe (Member # 2771) on :

i used to have a peweter and silver drop top with a vortech on it about 6yrs ago and then i hade a jade green notch about 2-3 yrs ago and the cougar has been in hidding but i have done a couple test drives around town recently and its orange and silver two tone

Posted by PopTheHood (Member # 7040) on :

Guess not. Have you seen that white and orange bel air runnin around? That thing is nice. I drive the red and black 85 convertable.

Posted by adower (Member # 5955) on :

Im calling DSS and asking for the popthehood special

Posted by bottled02GT?? (Member # 1772) on :

quote:
Originally posted by adower:
Im calling DSS and asking for the popthehood special

+1 lol

Posted by PopTheHood (Member # 7040) on :

Thats funny!! PopTheHood Special.. haha [Big Grin]

I got started on the project today. I got the old motor pulled.

[ December 14, 2006, 09:38 PM: Message edited by: PopTheHood ]

Posted by 2stangs69-91 (Member # 1951) on :

I hope it came with a ballancer and a flywheel because 331's and 306's can use different ballance weights. Most 331's are 25 oz. and 306's are 50 oz. Hopefully yours is the same. If after you start it you feel a big vibration this is why.

Posted by PopTheHood (Member # 7040) on :

It needs a 28oz balancer and flywheel which are on their way here.

Posted by SPEC -Fabrication (Member # 4980) on :

quote:
Originally posted by PopTheHood:
Guess not. Have you seen that white and orange bel air runnin around? That thing is nice. I drive the red and black 85 convertable.

yeah, I did all the chassi work on it , 4 link, 9" also sports a 468ci [Big Grin]

Posted by 88DroptopGT (Member # 2535) on :

quote:
Originally posted by PopTheHood:
Guess not. Have you seen that white and orange bel air runnin around? That thing is nice. I drive the red and black 85 convertable.

The one with no hood and a nice interior?

That thing used to be at Bud's all the time. That car was sick!

Posted by v-town50 (Member # 4920) on :

quote:
Originally posted by PopTheHood:
Guess not. Have you seen that white and orange bel air runnin around? That thing is nice. I drive the red and black 85 convertable.

haha that chevy is eriks thats a fuckin nice car, not one thing hasnt been touched on it. he even has a car seat that matches the interior

Posted by PopTheHood (Member # 7040) on :

maybe that bel air would be interested in a race? What do ya think. Think i could get him?

Posted by v-town50 (Member # 4920) on :

no way im pretty sure he wouldnt race that thing. its more of the family cruiser, and its bagged all the way around so its not exactly setup to race lol

Posted by PopTheHood (Member # 7040) on :

I heard from someone else that he would race. Do you know Kieth with the white 86 mustang. he said he would race for sure. so you think i would get him?

Posted by 1FAST89GT (Member # 5071) on :

quote:
Originally posted by PopTheHood:
I heard from someone else that he would race. Do you know Kieth with the white 86 mustang. he said he would race for sure. so you think i would get him?

kieth said he would race the 86 against your 85?

Posted by PopTheHood (Member # 7040) on :

that would be cool. My car is a lil taken apart right now. and its not gonna have the 302 in it anymore. he doesn't know that im doing this swap but it would be fun to race him. who else has a fast car around here? i wanna racce a car that knows their time so i could see how i do against them.

Posted by v-town coupe (Member # 2771) on :

quote:
Originally posted by PopTheHood:
Guess not. Have you seen that white and orange bel air runnin around? That thing is nice. I drive the red and black 85 convertable.

yeah virg. and ty pretty much summed it up its a 57 468 bb fully bagged and it has a train horn and whistle. dudes name is erik and well this is one of the many faces that car has had wouldnt be surprised if in another year is painted different and what not i think this scheme is the 4th time he has redone his car.

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