Can I make a 302 into a 327 or 350? - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old Oct 23rd, 02, 11:16 AM Thread Starter
 
Join Date: Oct 2001
Posts: 233
Mortec shows that the same block number is used for the three engines.

3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

If I can get one of these blocks which one would be best to build and will have more HP.
4U 2 NV is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old Oct 23rd, 02, 12:23 PM
Senior Tech
 
Join Date: Feb 2002
Location: Williamstown,PA
Posts: 500
Blocks don't make horsepower. The stuff you put in them and on them makes power. The only issues with a block are fit, originality, size, and durability. You can make any four inch bore block into a 302, 327, 350, or 377 depending what crankshaft you use. If you can find an original DZ 302 block please sell it to someone with a Camaro who can make good use of it. Any four inch four bolt main block will make a strong foundation for a high power engine and you can always put splayed caps on a two bolt block if you need the added strength.

------------------
'69 RS Camaro
355 5-speed 4.11
1 2RUN is offline  
post #3 of 11 (permalink) Old Oct 23rd, 02, 01:44 PM
Senior Tech
 
Join Date: Aug 2001
Location: Atco Raceway
Posts: 2,069
Send a message via AIM to CamaroNOTcamero
not to be a D*ck but i think you mean, 302, 327, 350 or 383.
A 377 is a destroked 400 block.

Personally if i was starting from scatch and had to buy a block, i'd be looking for a 400 block that's usuable and using a 3.75" stroke crank in it.
If the crank needed to be ground i'd have it offset ground also (stroked even more).
CamaroNOTcamero is offline  
 
post #4 of 11 (permalink) Old Oct 23rd, 02, 01:53 PM
DjD
Retired
Dennis
 
DjD's Avatar
 
Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,486
Garage
Woops!! Out of the mouths of babes!!! it has to be a 4.030" bore to be a 383.....
DjD is offline  
post #5 of 11 (permalink) Old Oct 23rd, 02, 03:30 PM
 
Join Date: Apr 2000
Posts: 21,341
Or even a 400 using a custom 4.00" crank AND MUCH GRINDING!!!

He, He!! I just had to!!! pdq67



pdq67 is offline  
post #6 of 11 (permalink) Old Oct 23rd, 02, 09:54 PM
Senior Tech
 
Join Date: Feb 2002
Location: Williamstown,PA
Posts: 500
4 X 4 X 3.75 X .7854 X 8 = ? I'll let you do the math.

------------------
'69 RS Camaro
355 5-speed 4.11
1 2RUN is offline  
post #7 of 11 (permalink) Old Oct 24th, 02, 11:43 AM
Senior Tech
Eric
 
Join Date: Dec 2000
Location: Kentwood, MI
Posts: 8,097
Well said 1 2 Run. Your exactly right about the sizes 302, 327, 350, 377.

CNC - a 4.030" block can be used to make a 306, 331, 355, or 383. A 4.060" bore can be used to make a 310, 336, 360, or a 388.
Eric68 is offline  
post #8 of 11 (permalink) Old Oct 24th, 02, 08:22 PM
SY1
Senior Tech
Dave
 
Join Date: May 2001
Location: Michigan
Posts: 2,920
Has anybody out here built a long rod 302+.030 (306)? I need to turn my 331 small journal crank again and I'm considering picking up a 283 crank for it. I noticed that the 383 pistons designed for the 5.7 rods have a comp height of 1.425". With a 3" stroke and a 6" rod it should work out to .075" quench if my block hasn't already been decked, which I believe it has since the pad stampings are gone. I think I can deck it enough to get my quench down to .015-.030 without any problems. If I ran Speed Pro hypers H635P with .240' domes I'd get 12.6:1 with 64cc chambers and if it proved too much 76cc heads drop it to 11:1. I know the later wouldn't be a problem with the 6 " rod, especially if I am careful on my cam selection. Airflow has already proven you can run 11:1 with a 6" rod on pump gas today. Any thoughts?

[This message has been edited by SY1 (edited 10-24-2002).]
SY1 is offline  
post #9 of 11 (permalink) Old Oct 24th, 02, 09:17 PM
Senior Tech
 
Join Date: Aug 2001
Location: nj.usa
Posts: 246
I dont know much about building engines but I remember very well reading at pop. hot rod. about 5 years ago that you can even have regular 350 engine run on pump gas with 11:1 comp. if you have smaller cc heads(55cc) with better flame propogation like flat top pistons. thay achived this in the article angle cutting production 64cc heads.
ismail is offline  
post #10 of 11 (permalink) Old Oct 25th, 02, 08:38 AM
Senior Tech
Eric
 
Join Date: Dec 2000
Location: Kentwood, MI
Posts: 8,097
SY1, that's a good idea. You could also have that 283 crank offset ground to eat up some of that extra deck height. Might be easier than decking the block another .040" or more. I think you would gain an extra 3 or 4 cubes out of it if you offset .020".

You might also look for a short 350 piston with a compression height of about 1.50". I found that compression heights vary a little from mfr to mfr - don't they normally run about 1.55"?

You could always mill a flat top 350 piston down a little, but then you would need a very small cylinder head to get the kind of compression you are looking for.

I think KB's tend to be on the taller side - my new SRP flat tops were .009" shorter than my old -12cc dish KB's.
Eric68 is offline  
post #11 of 11 (permalink) Old Oct 25th, 02, 06:37 PM
SY1
Senior Tech
Dave
 
Join Date: May 2001
Location: Michigan
Posts: 2,920
Eric,
Good thought about offset grinding the crank. It certainly wouldn't hurt to pick up any extra cubes on the little motor. I'd seen a couple of NOS 283 standard cranks still crated, if I was lucky enough to get one of those it would be nice to not disturb the tuftrided bearing surfaces. But if I get one I need to grind offsetting the throw is something I'll consider.

I believe the 400 pistons are 1.56' comp heights and 327 are 1.675, 302 are 1.80 and 383 for the 5.7 rod are 1.425. I'm not sure about 350 pistons, I haven't built a 350 since I blew my last couple of them in 1980. I've stuck with shorter stroke motors since then, just personal preference. I know the figures for the comp heights ar from Chevy and they do vary some. The thing I think I'll do is put it together and see how it mics out and decide what needs to be done. I thought about milling the pistons, but it's a little tricky unless you're running flat tops.

I'd wanted to build a short stroke, long rod 400, but after another round of bad news from our company, I've decided to just work with the small journal block I've got on the stand right now.

Dave
SY1 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome