Tech / General EngineIs 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!
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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.
__________________ 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
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-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.
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.
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 02:13 PM.
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.
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.
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 09:32 AM.
