Search



Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine
Register Forgot Password?

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
Sponsored by Weld Racing
Click Here

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 08-27-2005, 11:47 PM   #1
Junior Member
 
Join Date: Jul 2005
Posts: 19

Classifieds Rating: (0)
Proj hp numbers w/ 350ci and 336 heads

Ok, first I would like to say that this is Midnyte 81. Now back on subject.
I have this, and this is what I'm finally sticking with:
-mildly ported and polished 3986336 x heads 76cc
-1.5 roller tip rockers (Comp Cams) and hardened pushrods (Federal Mogul)
-Assembled 4-bolt main 350 bored 0.060 w/ stock rods
-Old Style Lunati flat top cast pistons 9.5 CR on 76cc head
-Comp Cams XE268 cam and lifters with 477/480 lift
-Holley 750 DP carb, z-28 aluminum manifold, and 110 GPH fuel pump
-MSD 6AL ignition
*Take note that this in no way will be a race engine. This will not see a day above 6000rpm*

Now, can someone put this on engine dyno and help me out with an estimated hp number on this? In the very near future, I'll get 2.02/1.60 valves on the heads and get a 3-angle valve job for $200.00, but I just got back home from a long deployment and don't really feel like doing it at the moment. Also, this will be going into an 84 z28.


Any help is appreciated!
midnyteeight1 is offline vBGarage Page   Reply With Quote
Old 08-28-2005, 01:52 AM   #2
Supreme Member
 
Join Date: Jan 2002
Location: Valley of the Sun
Posts: 3,852
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer

Classifieds Rating: (0)

Probably around 350 hp. What about the exhaust?
__________________
LT1 headed LG4 305 beast! Comp Solid lifter XS-262-10S, 1.6 Roller Rockers, 10.2:1, Holley 4160 600cfm, modded Weiand 7502 intake to fit LT1 heads____ Custom cylinder head cooling. Weiand 8208 Short Water Pump____TH-350 3 series 3.73 with 2 series posi and spacer____ Hedman Hedders 1 5/8 headers and Y-pipe 3in Exhaust, Dynomax 3" Bullet muffler ____Moroso Ultra 40 Wires ACCEL HEI Super Coil ____Competition Engineering 3120 Bolt-on SFC's____Homemade: Wonderbar, solid tie rod sleeves, Aluminum LCA and Panhard Rod with spherical rod ends, alternator and PS bracket, Strut tower brace, and Decoupling torque arm with telescoping link.
3000lbs

"The liberty of a democracy is not safe if the people tolerate the growth of private power to a point where it becomes stronger than their democratic State itself. That, in its essence, is Fascism - ownership of government by an individual, by a group or by any controlling private power."
-FDR

"If this were a dictatorship, it'd be a heck of a lot easier, just so long as I'm the dictator."

-- President George W. Bush
During a photo-op with Congressional leaders on 12/18/2000.
ME Leigh is offline vBGarage Page   Reply With Quote
Old 08-28-2005, 03:32 AM   #3
Junior Member
 
Join Date: Jul 2005
Posts: 19

Classifieds Rating: (0)
I'll be using 1 5/8 hooker comp headers and the infamous y-pipe that nobody seems to carry. I'm going with this setup because it cost me only 200 dollars to clean the heads, buy the gaskets, and check the pistons. (Engine was in a flood) I already have Flowmaster 80 series muffler.
midnyteeight1 is offline vBGarage Page   Reply With Quote
Old 08-28-2005, 01:11 PM   #4
Junior Member
 
Join Date: Jul 2005
Posts: 19

Classifieds Rating: (0)
Also, is this 350 at the flywheel? I'm looking at a Car Craft article with home ported 993 heads and the same mods I have making 421 hp and 438 ft/lbs of tq. I know it sounds far fetched, but If thet "say" they made that much, I would definately make more with ported and port matched intake runners, bowl blending, and polished exhaust ports. What I really need to know is: What was the stock intake runner and exhaust port volume? That way, I know the increase from the flowbench test. remember that these are the 336 "x" heads that are supposed to have the larger intake port. The last thing I want is an approx hp/tq numbers from info above. I appreciate the help!

Last edited by midnyteeight1; 08-28-2005 at 01:13 PM.
midnyteeight1 is offline vBGarage Page   Reply With Quote
Old 08-28-2005, 08:06 PM   #5
Junior Member
 
Join Date: Jul 2005
Posts: 19

Classifieds Rating: (0)
I had 993 heads but had to get rid of them. I know there are better stock heads out there, but I'm not looking for one. I already had the 336x's from years ago (Now I sound like I'm old) and I'm just trying to get the old Z28 some pep in her step.
Attached Images
File Type: jpg picture054.jpg (38.8 KB, 68 views)
midnyteeight1 is offline vBGarage Page   Reply With Quote
Old 08-28-2005, 10:11 PM   #6
Supreme Member
 
Join Date: Jan 2002
Location: Valley of the Sun
Posts: 3,852
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer

Classifieds Rating: (0)

So did you have them flowed? Port volume cannot be correlated or extropolated into port flow. Porting and polishing can actually make flow worse if done incorrectly.
ME Leigh is offline vBGarage Page   Reply With Quote
Old 08-29-2005, 12:06 AM   #7
Junior Member
 
Join Date: Jul 2005
Posts: 19

Classifieds Rating: (0)
I should say then I have removed those gross and obvious casting flaws and port matched the intake manifold and heads. The intake and exhaust are bowl blended and the exhaust ports are polished. You would never think cast iron would shine like that. I'm not hogging out the ports and they have maintained integrity. The exhaust port is already the size of the headers and gasket ( 1-5/8 in), so there was no need to enlarge there. I also smoothed out the short side radius. I know I could have gone with the XE 274 cam, but it seemed like too much cam for pure street. Besides, I didn't want to get into that "Gray" area where you would need screw-in studs.

Last edited by midnyteeight1; 08-29-2005 at 08:32 AM.
midnyteeight1 is offline vBGarage Page   Reply With Quote
Old 08-29-2005, 10:05 PM   #8
Supreme Member
 
F-BIRD'88's Avatar
 
Join Date: Sep 2001
Location: Ontario, Canada
Posts: 5,833
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction

Classifieds Rating: (0)

If you want to stay out of that "gray" area, drill and pin the studs. thats all that is required.
F-BIRD'88 is offline vBGarage Page   Reply With Quote
Old 08-30-2005, 12:46 AM   #9
Junior Member
 
Join Date: Jul 2005
Posts: 19

Classifieds Rating: (0)
I didn't want to get the screw-in studs at the time because I'm getting robbed by the machine shops down here. 200 for it, not including the studs.
midnyteeight1 is offline vBGarage Page   Reply With Quote
Old 08-30-2005, 12:46 AM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine

Tags
336, 336x, 350ci, 3986336, 3986336x, 76cc, bench, cylinder, engine, flow, head, heads, numbers, sbc, sleeves
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 02:28 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All content copyright 1997 - 2014 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details