I've heard you have to use a 307 block and crank bored out with 5.7 rods and 350 pistons. What other parts come from the 350 and which ones are from a 307? Will 350 heads fit the 307 block?

I could be wrong, I've never built a 327, but I'm pretty sure that the only thing that comes from a 307 is the crank.

The 350 and 327 both have a bore of 4.000 while the 307 has a bore of 3.875. That means you'd have to bore .125 out of it (total across the diameter), which seems like a lot. It'd be easier to start with a 350 block. I have no idea if 350 heads will even bolt to a 307 block (you certainly don't want to use the 307 heads - tiny valves). I'm pretty sure 350 heads won't bolt to a stock 307 block because the valves won't fit down into the narrow bore (could be wrong on that). that might not be a problem with .125 bored out, but it'd still be sketchy and there might be other problems.

I'd really recommend using only the crank from the 307. That way you'd have the wide bore and the strength to handle all the horsepower. A 307 is pretty weak (I know, I have one) compared to a 327, probably not built to take all kinds of horsepower. Even more so with all that metal taken out of the bores. The 350 block is plenty beefy and already has the bore you need.

You'd probably be able to pick up a good junkyard 350 core for less than you'd pay for the machine work on the 307 block.

JMO - if I'm wrong, anyone can feel free to correct me.

327s have their own pistons, even though 302 and 350 pistons will fit in the hole they have the wrist pin too high or too low for a 327.

Any large journal factory 4" bore block should work. Probably the easiest to get would be a 350 block. A large journal 302 or large journal 327 block will also work.

If you have a 307, you could use just about everything except the pistons and the block for the 327. Using the factory crank/rods from the same engine might give you better side clearance, plus they're likely balanced well enough unless you're planning a very high rpm motor.

Also make sure the starter mounting holes in the block will work for a starter that'll work with your flexplate or flywheel. Starter mounting hole come staggered or straight across from each other, and the starters will either fit the 153-tooth or 168-tooth flexplate. Some blocks may be drilled for both.

It may be cheaper to build a 350, the main factor being pistons.

AS far as 350 heads go, they'll work fine, but you'll want something like 64cc chamber volume which will be hard to find in stock heads with hardened valve seats. Maybe 305 heads and flat tops. 76 cc heads are all over the place, and may give a good CR with domed pistons, but they aren't known as performance heads.

Might be a good candidate for Vortec heads or 58cc 305 heads.

[This message has been edited by Glenn1018 (edited 02-14-2003).]

The 350 heads will work on a 307. I have a friend with a pair of camel humps on a stock bore 307.

Daniel

If you use the 307 pistons with a 350 crank (3.48 stroke) and 400 ci (5.565) rods you'll be .020" lower than stock compression height. With a 9.025" deck height, the top of the piston would be .045" down in the hole. With a standard bore, this would make a 328 ci engine. If you decked the block to a 9.00 in deck height, this would get you back to a stock compression height. If you want a 327, its easier to just use your 307 crank in a 350 block and 327 pistons. It will rev better too.

Not to hop but there's a thread in chevytalk that has a bunch of guys doing a full cavity search on the 327
http://www.chevytalk.org/threads/showflat.php?Cat=&Board=UBB64&Number=304430&page=&view=&sb=&o=&fpart=1&vc=1

OK, just a good old-fashioned 327 combination... Ta heck with the big numbers and fancy parts!!!

W/P's S/R big valve Torquers. (Read, 170 cc heads).
A Little Fireball or a CC 268HE cam. Unless you want to go solid, then go with a modern, high lift version of an old Little Duntov solid -097 cam.

Shoot for like 9.75 to 1 CR using four valve relief flat-top type pistons.. Use min. quench height and play with headgaskets to help out here.

A set of either 1.5" or 1.625" four tube, long headers and a good free flowing dual exhaust setup.

A good dual plane intake like either a Performer or an 8004, or step up to an RPM, Stealth or 300-36!! Add a 600 cfm 1850 Holley OR a tuned to your engine Holley 750, 3310- carb.

I will guarrantee this engine will put a GRIN on your face, MR. Clean can't remove if you gear and tire right to take advantage of it's midrange and upper grunt!!! pdq67

PS., and please don't get into the "more/bigger is better" thing b/c the little engine doesn't need all that much b/c GM got the little sucker almost dead on the first time!!!

pdq67, I agree 100%. The beauty of the 327 is that it's a 327. It is what it is, a good mid to high RPM motor not famous for low end torque.

If someone wants lots of low end torque, they should think about a longer stroke engine and something like a 2.56-3.08 R&P, and not think about how to alter the 327 to make it something it isn't.

I think most people screw up when they get hung up on hp numbers and try to get a smaller engine to have more hp than a larger one. It can be done, but at the expense of practicality, streetability, and a lot of money.

I'm asking because there was a 307 for sale locally for a few $$$s. My brother has a 305 in his Camaro that is a p.o.s.
I was wanting to build him a nice 327 instead of a 350 for its reputation as a fast reving, fun engine.
I'll try to find a good 350 block and a 307 crank and rods.

Will the heads from the 305 work on the 350?
What valves are in the 1986 305 G engine?

I know it's not a Chevelle. I'm guilty of being a part of the Dark Side.(454)In my 66 Malibu.

I'm just tryin' to build him a motor that can hang with his big bro w/out twisting his car in two. http://www.chevelles.com/forum/smile.gif

JakeS,

That 307 will be a dandy little engine if you make it like I mentioned earlier about the 327. I would just use a Crane 266 cam, that's all.. pdq67

My simple 327 combo:

327/350 block (4.00 bores) bored .030 over
327 crank
flat-top pistons
Vortec heads
Performer RPM (Vortec specific design)
CC 268HE cam

The key to having fun with this engine (IMO) is gearing. When I went to the 3.73's it made all the difference in the world. It doesn't have a lot of low-end torque, but it will wind up in an instant.

------------------
Paul Hesco
www.chevelles.net/nfc (http://www.chevelles.net/nfc)

will the 305 heads work on a 350 block? Are they even worth putting on a 327?
1986 camaro G code engine

305 heads will work. I think they have 1.84" intake valves.

A while back I was looking into them and found that some are supposed to flow better than most, but I don't know the casting numbers.

If you're looking at a budget minded 327 I'd say they're worth considering. Probably need the guides checked and a valve job. They'd be an economical way to get a CR of 10+ with flat top pistons. Run a check through a CR calculator before you buy them to be on the safe side.

If you're thinking about a serious motor you may want something else instead of putting a lot of money in 305 heads.

I don't know much about them, but I'd guess the downside of the 305 heads would be their flow numbers, but for a street driven 327 they may be just fine.

Do you have a 305 or a 307? The 307 heads probably have 1.72" valves and 69cc chambers.

I'd definately choose the 305 heads over the 307s for a 327 because of the hardend seats, larger valves and higher CR. Then again, plenty of smaller cube engines have run well with the smaller valves. Just my .4 of a nickel's worth.

<BLOCKQUOTE>quote:</font><HR>Originally posted by JakeS:
will the 305 heads work on a 350 block? Are they even worth putting on a 327?
1986 camaro G code engine<HR></BLOCKQUOTE>

If you really want to make that 327 shine, get the best aftermarket heads that you can afford. That way the 327 will run great, and you can use them on any small block that you build in the future.

If you want a fun 327 that pulls hard to 5500 rpm, is pleasant to drive, and gets decent mileage, check out the combo in my signature.

Mike



------------------
BDE 327:
Bored .030", balanced, TRW 9.35:1 pistons, Crane Energizer cam .454" 216 @ .050", Trick Flow heads, Edelbrock Performer, Quadrajet.
Home page: http://home.peoplepc.com/ppages/viewpage.asp?MemberName=mbey
327 photos: http://photos.yahoo.com/bc/unclepennybags_2/lst?.dir=/My+Photos&.src=ph&.order=&.view=t&.done=http%3a//photos.yahoo.com/

I want to build something a little different,
I have a 327 out of a 64 vette, and just to be different i want to put a 85 camero tpi and a blower/turbocharger on it. Anyone have any suggestions on a good combo? I want to put it in the shop for the machine work soon as i finish bootcamp but i want it to be well planed out first. I want to be able to toast the ricers, with a sbc

I was asking because I already have the 305. It is the engine the 327 will be replacing. It is strictly street driven and will never see 5,000 rpms cause my brther's a puss.

Are there any other parts I could use from the 305? flywheel, 5speed, intake manifold?

Jake, is this by any chance a 3rd genie Camaro 305/T-5 you're using parts from to make a 327/5-speed?

yeah, it's an 86. I'd only planned on using the flywheel and tranny(till I put a th350 in there).
If I can get away with using the heads until I can afford some nice aftermarket ones, or find a set of Vortecs to buff I will. But if they're too much trouble, I'll just wait to find some good ones.
I know it's an emmission controlled vehicle, but if my brother decides he wants a 350 in there instead, I'm gonna' put it in a 95 S-10

[This message has been edited by JakeS (edited 02-18-2003).]

If that's what you're doing, then I'd just throw the 305 heads on it and let it eat.

Now I don't know anything about cars that have computers, so I suppose there's the possibility that the different heads could produce a different O2 reading, for example, and cause the computer to cause something else to act weird. I don't know.

I've been asking T-5 questions (not much help yet) in the Transmission forum and I'd like to know what you do as far as your starter and X-member.

It's my understanding that the 60s manual cars required the iron nose starter to clear the bulge in the bellhousing. Love that search function.

But that was a while back...I'm guessing that you'll need to use the 305 starter that was originally used with the T-5 in the Camaro. T-5 info is hard to come by.

I think the 86 is a NWC (non-world class) T-5, which I think means it uses gear oil. Make sure you check because the WC T-5s use Dextron. ANd be easy on it, it may have the 300 lb ft torque rating, and it may not. There are many variations of the T-5 in Chevy applications alone, but the V8/T-5s are the strongest, with the WC versions being more desirable.

If your 327 is being made from a 2-piece main seal block, you'll need an old style 153-tooth flywheel, which I think should work with the Camaro starter. You might want to check the starter bolt pattern before you get too far into it. I'd mock up the block, starter, and bellhousing for a trial fit before doing much more. I'm not sure of any of this, but I have been doing a lot of research on it lately.

If you're using a one-piece rear main seal 350 block for your 327, I'd think the 305 flywheel and starter should work.

Let us know what happens. Hth

I'm just lookin' for a streetable 240 to 275 HP/Torque combo.

The tranny does use gear oil. It's in the Camaro right now. I'm still collecting parts. I just wanna' get the right stuff first. I don't have a lot of storage space.

I don't know what flywheel is on the SloMaro right now, but it'll probably stay along with the starter.

the engine has already been converted to HEI during a carb swap. It's got an Edel600 w/a spacer.

Jake, you could build up the 307 and make a
monster out of it, if you followed Popular
Hot Rodding's Engine Masters Challenge the
third place finisher was a 307! It had GMPP
heads, 3.935 bore, 3.750 stroke, 12.2 to 1,
it made 556 hp at 6,500 rpm.
NOT TOO BAD FOR A LOWLY 307 (364.8 Cubic Inches)
If you want to email me I live about 50
miles to the east of you and have a ton of
stuff around here, and a bit of knowledge.

<BLOCKQUOTE>quote:</font><HR>Originally posted by JakeS:
...It is strictly street driven and will never see 5,000 rpms cause my brther's a puss.
...<HR></BLOCKQUOTE>

5000 RPM can come up REAL quick in a 327. http://www.chevelles.com/forum/biggrin.gif That's what it's made to do.

------------------
Paul Hesco
www.chevelles.net/nfc (http://www.chevelles.net/nfc)

If it ends up in the s-10, I'll be using it as my daily driver. I don't wanna' get too crazy with the machine work.

-test the block for cracks
-check cylinder runout/hone
-balance rotating assembly
-if $ permits/friction coat pistons

I'm trying to keep it under 1,000 dollars.

Oh, if it does go in the S-10 I'm gonna' fab up some ladder bars and coil springs. And you can be sure if it's in the truck it will see close to 7,000 rpm at least at the strip.