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305 to 327?

P

Pvt. Maggot

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Hey guys,
I herd this somewhere, can't remember where, but has anyone herd of making a 5.0 305 into a 327? What all would be needed? How much power could you expect compared to a stock 327? Any info would be great, just though it might be a cool little project for a s10 or something. :confused:
 
It won't go into a 327 with any stock combo ( I KNOW OF ) . It can be made into a 329 with a 400 crank , and a 334 with a 400 crank and a .030 overbore .

If you want to be different go for it . It will cost more than a comparable 350 build though .

Get ready for the don't do it posts , only Ford guys can go fast with 5 liters :wink1:
 
If it's possible, guaranteed it will be a cost vs. benefit thing. 331 CID comes to mind for some reason.

In any case, if a 305 will fit, so will a 350, which will make more power, easier, than either of the ones you mention. :)

For a completely one off project, sure, it would be interesting I suppose. But the 305 isn't a great starting point, really based on the bore size, which tends to shroud valves, and that would probably really hurt a higher RPM motor that could use 2.02's, which is where you'd make your power.
 
Well, I have a 350 i'm building into a 383 stroker, and I have a 305 sitting around that I got for free with the 350, just figured while i'm building one, I could build both and have some fun. You really think it would cost more even budgeting? Can't use a 327 crank or any type of stroker crank? thanks for the info pauly! your def a big help!
 
You could probably build the 305 up as is for a lighter vehicle, some magazine fairly recently (last couple of years I think) built a pretty hot 305 didn't they?
 
I always herd the 305 was the motor that could be made high revving, guess I didn't hear correctly. I know the 350 is all around better, the one in my 89 is a beast, and i'm sure i'll be satisfied with my 383 supercharged thats being built for the K5, but I just thought it would be a cool little motor to build for a s10 or something, I know that when I had my 305 in my K5 with 3.08 and 35's it would spin them like nothing, granted it had an intake, carb, headers. but I always disagree with people saying 305's arn't a good motor, I was always impressed by my old 305.

So if you were to build this motor, what exactly would you do? 305 ported heads? vortec heads? 350 heads? Lets rack the brains shall we?
 
only thing you could do with the 327 crank is put it in a 350 if the 327 crank is a large journal and that will give ya a 327
 
But you couldn't put the 327 crank in the 305, and then bore it to match a 327? Sorry i'm no motor guru. guess I need to do some reading up on bore and strokes for some sbc's. :doah:
 
By the way, can the 305 block be bored to the same bore as a 350 safely or is it completely different?

I don't have a 305, I just heard that somewhere...
 
if you want a high reving motor to put in a s10 find ya a 283, if built right you can tack them around 9,000 rpms. small stroke=high revs
 
Why reinvent the wheel? :)

http://www.goingfaster.com/spo/carcraft325hp305.html

http://www.chevyhiperformance.com/techarticles/148_0409_chevrolet_305_ci_engine_build_ii/index.html

Didn't spend a bunch of time, but couldn't find part 1.

I note that the Vortec heads absolutely woke up the 305 in the car craft article. Would be interesting to see what they would have done all by themselves on the base engine. I'm wondering if those were actually L31 heads though, I thought those were 350 specific, the 305 Vortecs were something else. (chamber size in particular)
 
i know you can make a 305 scoot cause there is a local guy running one in a sprint car and it will pack the front wheels down the strait away, puttin out around 600 hp
 
I'm running 305 right nowin my Blazer. Blew the 350 up. I might rebuild the 305 later on down the road for a spare incase my foot gets heavy or such....
 
he told me that there is only certain 305 blocks that will hold that kinda of power, the machine shop i go to built the 305 in the sprint car and has the block #'s. ill try and get ahold of them for ya one day
 
a 305&350 have the same crank...smaller bore/piston....327LJ block is same as 350 block..shorter stoke,..so if thats taken in, you will see(short stroke)327 in (small bore)305 block, your right there around 280ish cid, a waste of money imo...

now a 400/383 crank will get you about 330ish, but why....save 305 until you find a 350 block, put your 305 stuff in it, + 305 heads usually bump compression up and you will have a 350 (+whatever overbore) and it will outperform either of these 2, built off 305 block, probally cheaper than either 1 also! 305 blocks should be recalled and melted like the government did morgan silver $'s,...they took alot/most all 1880's morgan $'s..melted them and made exact same coin w/1921 date, chevy should offer to buy back old 305 blocks melt them and pour 502 blocks :-)
 
As stated, I have a 350 block already that i'm building a supercharged 383 out of. I don't agree with all the negatives about the 305, I think they were a good motor, and mine never did anything but run its balls off. That being said, as jonrpick asked is it safe to bore a 305 to the 350 bore? I'm a bargain hunter, so I rarely pay full price for anything I buy, that being said, continue with the great info guys! thanks alot! :bow:
 
go here, you will see!

Duntz00 said:
he told me that there is only certain 305 blocks that will hold that kinda of power, the machine shop i go to built the 305 in the sprint car and has the block #'s. ill try and get ahold of them for ya one day
Click to expand...

http://www.mortec.com/borstrok.htm

http://www.mortec.com/ :deal:


most people around here look for the "0010"(3970010) block w/4 bolt main...there are many different castings w/ same #, the good 1 has like 3/4'' tall #'s on the block and upper 1/2 of 3 is missing from casting #(i have like 5 of these, the missing part of 3&big casting #'s, have all had @ 1/2'' flashing opposite the fuel pump, looks like core shift but isn't, well it is, but was done on purpose to align mains& all have been 010/020 blocks(1%more tin&2%more nickle) hd blocks...most other chevys casting #'s are like 3/8's tall, but if its this # ussually a good find

# ..............cid ......yr .....main..... application
3970010....302.....69......4..........Z-28 Camaro
3970010....327.....69......2..........Trucks and industrial
3970010....350...69-80...2 or 4


oh chevy made a 350 w/3.9 bore&3.66 stroke so be aware, you will know if you run across 1,..dual overhead cams..oh n/m...,..heres specs from that place..

350 = 3.900" x 3.66" ('89-'95, "LT5", in "ZR1" Corvette 32-valve DOHC, 5.74" rod)
 
No you can't, the walls aren't that thick.

If you've got the 305 already, if you can build some decent power without spending money on different cranks and stuff, go for it. But if you start talking about custom components, you'll spend the money that COULD go towards a complete 350 to rebuild. Don't read that wrong...if you can build a decent 305 for cheap based on the one you've got, go for it. But any money you WOULDN'T have to spend building a 350 to get the same or more power has to be seen as a waste, after you reach the acquisition cost of a rebuildable 350.

My 305 was actually a pretty decent motor. Even with 3.08's and 31's it went pretty good if I held it in gear for awhile, and it had a LOT of miles on it, and was mistreated long before I got it. My current 350 however, makes the 305 feel like a stock 1968 VW Bus motor, without using any really custom parts.
 
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