My dad and i were thinking of building a 327 stroker. Has anyone done this before? And if so how did it work out for you? What do you guys think about this idea??

 

What exactly is a 327 stroker? a 305 with a 350 crank?

 

hmmmm ,why not just build a 350 ?

 

No what I meant was we were going to stroke a 327 to how many cubic inches i forgot what the guy siad somewhere around a 350 maybe more than that. The reason why we are not going to build a 350 is because the ar that we got had a 327 with a good block. So my dad took it to one of the best machine shops around here and recommended that my dad stroke the engine. The engine is a 327 4 bolt main and we are going to have to bore it 60 over. It is going to have the double hum heads with the 2.02 intake and 1.60 exhaust. and we havent decided on the rest yet. O and the bottom end is all forged so that is anther good reason why we are going to keep it. Because those parts are also still good on it.

 

make sure the double hump heads have the accessory holes..otherwise it is a b**** mounting the power steering.Trust me I know..That is what I am running on mine.
I read about stroking a 327 before on the boards do a search and see what you get......336????
As for the 327..Love mine burries the tach..7000+ rpms and still going...not much bottom end torque though...thats why i'm building a 400..
Your gonna need a good stall...

 

Yea well i really wasnt looking for all that much torque though. Because its going into our project el camino. And if we put alot of torque in it I will just be spinning for days. Maybe thats why the guy recommended storking it. Thanks for the info. Riley how do you like your engine? Is it a high revver and what do you have in that 327???

 

My motor was built by a fellow who liked to take it to Scribner Ne. It was in a chevy monza and ran upper 12's...As far as specs I cant be real specific..4 bolt main forged crank forged pistons (the chatter proves that) the cam is very rough.Idles about 1000rpm really needs a good 3000 stall. The car really screams. worst problem I have is keeping traction ,at wot the car will get sideways at2-3 shift

 

You're gonna stroke a 327? I hope you realize that the 327-350-383 are all the 4" bore and if you stroke it to one of those #'s you're just killing what a 327 is all about.

And there's a lot better heads out there than the double humps. I guess if you have the double humps already thats ok, but if you horsepower, ditch em

 

How are you going to stroke it if you keep the bottom end, that would include the crank and you can't stroke it without changing that. If I were you since you say you don't want a lot of torque just keep it the way it is, a 327 will make plenty of power if it's built right. And as far as your other comment:

[And if we put alot of torque in it I will just be spinning for days. Maybe thats why the guy recommended storking it]

Stroking it will ADD torque not take it away.

 

Well that is what Riley said and he has a 327. So I would take his word for it. And if he says that his low end torque isnt that great and its a high rpm motor. Well i think by stroking it that it would move it down a little bit into the medium rpm range. That why I said what I did am i right?

 

This isn't intended to flame, but you really need to read what iroc22 & DartByU said.

This machine shop is really going to do you a favor: "Stroke" your 327 with a $50 cast 350 crank, in trade for your steel 327 crank (worth about $300 at least).

And, "327 4 bolt main"? GM didn't make such an animal. Are you sure it's 4-bolt main? Have you checked casting numbers on this block? It may have been a 350 that had a 3.25" stroke crank put in it, making it a 327. Or, 4-bolt caps put on a 2-bolt block.

"Torque" vs. "high-reving" is mainly in the cam, not the stroke (assuming the rest of the package is matched to the cam). How high you have to rev it to make power is the only issue between smaller and larger displacement 4" bore SBCs. This has been discussed time and again on this board, and the informed concensis is bigger cubes make more power. Every time. Stroke length isn't the issue.

Don't get me wrong - the 327 is a fine engine, and it makes more sense to build it as a 327 (or 331 if bored .030" over) than it does to "stroke" it. If you want longer stroke, get a 350 core and build it (or stroke it to 383); sell the 327 to someone who needs a 327 (like a numbers-matching restoration) to pay for your project.

 

I am positive its a 4 bolt main. And i dont know who you got your info that GM doesnt make a 4 bolt main 327 they do. Unless my eyes are lying and everyone else that has seen it. And I guess the guy at the machine shop who is one of the best machinests in town must have been lying too. If you want proof come to fresno and I will show you. I dont mean to act angry towards you but you are basically calling me a liar. And the numbers dont lie either it is a 327 4 bolt main. So whoever gave you the info that GM doesnt make a 327 4 bolt was wrong. I am sorry for getting so mad just dont say something you dont know for a fact.

 

327 and 350 are the same bore size. So, if you take a 4" bore (350) block and put a 3.25" stroke crank in it, you come up with a 327. Or, if you "storke" a 327, you come up with a natural 350, or if you use a 400 crank and bore it .030" over, a 383.

Like five7 said, AFAIK there was no such thing as a 4-bolt main 327 from the factory, ever. But it's a trivial matter to make one up since it requires no effort whatsoever, you just stick a 327 crank into a 4-bolt 4" bore block. Just because GM didn't make one doesn't mean you don't have one. And there are no numbers that will tell you whether it's a 4-bolt main; the casting number is the same no matter whether the factory (or someone else) installed 2-bolt or 4-bolt caps in it. Just because the factory didn't make it doesn't mean it doesn't exist, or that anyone is calling you a liar, merely underinformed.

I don't know how old you are or how long you've been building motors, but it sounds to me like I've probably been doing it alot longer than you've been alive, and five7 has too. Just because you don't know about old stuff doesn't mean that the rest of us don't either, for some of us that was the stuff we occupied ourselves with when it was new, because it was what was current and it was all there was.

Are you sure it's a 327? What's the crank #? What's the block casting #? What year is the block? What journal (large or small) is the block? Those ar ethe things that tell all. Post that stuff, there are a bunch of us that can probably tell you how you came around to having what you have without going to Fresno.

 

I've never seen a 4-bolt 327 either and I don't see any listings for one. Do you have the casting number? Nobody is calling you a liar, we're just trying to inform you ....or maybe you can inform us by showing us that you actually do have a 4-bolt 327. Anyway...

I say keep it a 327. They are bad little motors. You'll need some gears and a good stall to get you going but it'll love to scream to 7000RPM faster than you can imagine.

 

[Are you sure it's a 327? What's the crank #? What's the block casting #? What years the block? What journal (large or small) is the block? Those ar ethe things that tell all. Post that stuff, there are a bunch of us that can probably tell you how you came around to having what you have without going to Fresno.]
I dont have all the info on that because it is still at the machine shop. That why i was aking everyones opionion on it because we are going to have it done soon. When we get it back I will give you all the numbers and take pictures of it for you guys. I know it is a 327 for a fact because the guy at the machine shop ran the numbers and he said it came up to be a 327. And I know it is a 4 bolt block. And if you guys say then someone must have made it that way well then maybe they did. But hey when we get done with this thing it will be a moster either way.

 

Dude you should get that machinist checked out then.....GM NEVER made a 4 bolt 327 from the factory. 4 bolt main small blocks: 68-69 302 Z/28, the old LT1 and various 350s and 400s from 3/4 trucks.

 

I agree with the no 4 bolt 327. GM did not make a 4-bolt 327. The early 327 blocks had the smaller main journal cranks which are worth lot-o-monies, but the later blocks used the larger 350 size journal. But none of them came from the factory with 4-bolt mains. I would not stroke a 327. Stroking adds more torque, that is the whole purpose. March HotRod--
Cubes-more ci, more tq.
Lever Action-longer stroke is longer lever acting on the crank.
Compression-this is an "offer". You could have higher compression due to more cubes. More compression, more tq.
Sucking power-faster piston speeds creates bigger pressure drop in cyl. to create more cyl. fill
I have always wanted a 377. Just for the fact that I love the sound a a SBC singing a 7500 rpm song. The power characteristics, and the harnessing of that power is what I don't like.

 

Yup no 4 bolt .unless 4 bolt caps were added later..as in mine here look for youyself.

393288.....283...65-67...2
460703.....350.....78....4
460776.....305...78-79...2
460777.....305...78-79...2
460778.....305...78-79...2 or 4, some Canadian heavy duty truck blocks have 4-bolt main caps
471511.....267...79-82...2
3556519....283...58-61...2
3703524....265.....55....2...No oil filter
3720991....265...56-57...2
3731548....265...57......2...No side motor mounts
3731548....283...57......2...No side motor mounts
3737739....283...58-64...2
3756519....283...58-62...2
3782870....327...62-67...2
3789817....283...62-64...2
3789817....327...62-67...2
3789935....283...61-64...2
3790721....283...62-64...2...Chevy II recessed oil filter boss
3790721....327...65-66...2...Chevy II recessed oil filter boss
3791362....327...62-67...2...Chevy II recessed oil filter boss
3792563....327.....65....2
3792582....283...64-65...2
3794226....283...58-63...2
3794460....327...62-64...2
3814660....327...68-69...2
3830944....327.....63....2
3834810....283...64-66...2
3834812....283...62-63...2
3837739....283...58-62...2
3849852....283...57-66...2
33849935....283...65-67...2
3858174....327...64-67...2
3858180....327...64-67...2
3858618....350...68-76...2
3862194....283...65-67...2...Chevy II recessed oil filter boss
3862812....283...62-64...2
3892657....302.....67....2...Z-28 Camaro
3892657....327.....67....2
3892657....350.....67....2...Camaro
3896944....283.....67....2
3896948....283...66-67...2
3903352....327.....67....2
3914636....307.....68....2
3914638....327.....68....2...Truck
3914653....307...68-73...2
3914660....327.....68....2
3914678....302.....68....2...Z-28 Camaro
3914678....327.....68....2
3914678....350.....68....2
3931174....307.....68....2...Truck
3932371....307...69-73...2
3932373....307...68-73...2
3932386....302.....69....4...Z-28 Camaro
3932386....327.....69....2
3932386....350.....69....4
3932388....350.....69....2 or 4
3933180....327...68-69...2
3951509....400...70-71...4
3951509....400...74-80...2
3951511....400...70-73...4...Some replacement blocks had 2-bolt main caps
3956618....302.....69....4...Z-28 Camaro
3956618....327...68-69...2
3956618....350.....69....2 or 4
3956632....307.....69....2
3959512....327...62-67...2...Was also used for some replacement blocks
3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....

Hey 5 seven !!! missed ya!!
Come on guys take it easy ....I'm sure he saw 4 bolts if he said he did..afterall you did have the pan off , Right????? Right Hot Z ,you did have the pan off...

 

Yes of course I had the pan off. And when I saw the four bolts thats what I put. I am sorry for the mistake. I had no clue they didnt make a 4 bolt 327. I am sorry and now i know. Thank you guys for your help now i know something new.

 

Hey , its cool . If I knew all there was to know about the sbc and 3rd gen I wouldnt be on this board...never be afraid to sound silly, hell I dont make much sense most the time.......heck im a carpenter what could I know about cars
Stick to this board you will get lots of help,,,,,,some you wont even like

Hmmm I think I'll put the 327 in a Mazda..

 

Well we out in the order today for the motor and it should be done sometime by the end of next week.

 

336 out of a 327? i built a 336 stroker out of a .030 307 chevy block and pistons, 350 crank and 400sbc rods. It was a very good rpm motor. I woouldn't build one again, but it was a good combo.

 

It's cool, dude. Like I said, no flame, just info.

Do you know if the engine is large or small journal? Doesn't make a lot of difference, but the majority of 327's were small ('68 & '69 only large journal years - I had a truck '68 many moons ago).

You should be quite pleased with the engine, especially if you previously had a 305. I've always had a soft spot in my heart for 327's, would love to have another.

BTW, a .060"-over 327 is 336.6 CID (bradkeith, I only get 333.4 CID for that stroked 307 combo). .060"-over was fairly common. I also had another variation on the theme - a .060"-over 327 (small journal) block, 283 steel crank (that works out to 310.7 CID), 12.5:1 forged TRW pistons, solid LT1 cam, 2.02 LT1 heads - never really did get the most out of that engine, but even so, it screamed...

 

Hey can anyone answer this question for me. What would be a 327 that has been bored 60 over and it is going to have a 350 crank with the 327 rods. Can anyone tell me the cubic inches i will have now. Thank you very much

 

358, i think. sounds like you're going out the back door and across the yard and around the house to end up on the front porch. let me get this right you're taking a 3.48 crank and grinding it to fit a SJ 327 block. why not use a 350 block and crank and save the jack on machine work, you'd have the same thing and the rods are 5.7 as well.

 

It should be a 350.

The 327 large journal blocks are neat. You can make one easily but a factory one is rare. My dad has one in his '68 Nova...

Hey five7kid that sounds like a pretty mean '302' (310) you had there...283 steel crank=lightest sbc crank.

 

The rods don't affect CID, but, the answer is 3.48(350 stroke)/3.25(327 stroke) times the 336.6 I quoted above, or 360.4 CID.

If the 327 is large journal, there isn't any machining to do on a 350 crank to make it work. The LG 327 cranks weren't steel, though, IIRC.

iroc, that 302 was the meanest engine I ever had. I spun a bearing in the LG 327 I mentioned above, traded it and just $800 more (in 1973 dollars) for the 302. I only ran it once, on an 1/8 mile track, in another '57 I had with 3-speed stick, open 3.55 rear (I've only recently beat that 1/8 mile time with the 396 in my current '57). But, that was back in the mid-70's, when OPEC decided we had it too good, and premium disappeared off the face of the earth. In '79, I was being shipped to Germany, and I sold that engine in the other '57 for $400 total!


Oh, the things you've had that you wish you had back...

I threw away a .030"-over 4-bolt 350 block with cracks in the lifter valley when I had to move here from California.


Sold a stock bore 4-bolt main 350 with a trashed #6 rod bearing for $75 in '98.


I'd better stop before I start to cry...

 

As I said 336...