Help me please!!!!!

84rockinGT · 04-06-2003, 07:10 PM

Hi guys I have a problem.Just put my motor together today it's a 1981 302.I put a cam with 488 lift and new springs and lifters.I ported the heads out a little.Anyways the darn thing wont start.I have gas and fire.I didnt install the headers yet but it still should start without them I think.I reused the old valves and installed them in the same hole that they came out of.I have an edelbrock intake and a predator carb.The timing i beleve is on.It wont even backfire.Could this be from not lapping the valves when i reinstalled them?I really need some help here.Thanks guys!!
Jason

fiveOguy20 · 04-06-2003, 09:59 PM

DUDE!! u hafta have ur headers on!!! ur motor will never run good or at all without.. thats ur problem

84rockinGT · 04-07-2003, 06:02 PM

I've ran other motors before without the headers on.You just cant run them long or you burn up the valves.So sorry bude but that aint it..Any other suggestions?

fiveOguy20 · 04-07-2003, 08:26 PM

well i've never seen or heard of neone tryin to fire a motor without headers on an thats the only thing that dont sound right in ur post sooo i hope u figure it out man

88workcar · 04-07-2003, 08:49 PM

Check to see if the plugs are wired according to the firing order of the cam.

techsan · 04-08-2003, 05:32 PM

You should be able to crank the car without the headers, however its not a good idea to run for long, like you said earlier. In your original post you said you thought the timing was on but it wouldn't even backfire, it sounds like it may be 180 degrees off. You can rotate the engine one complete revolution to get it on the intake or exhaust stroke (can't remember which one you need). Then rewire the plugs and check the timing. I know on a 5.0L there is an indicator on the crank pulley that shows Top Dead Center, it may be worth a shot. Hope this helps.

silver_pilate · 04-09-2003, 02:45 PM

Might have slipped the distributor in a couple of teeth off.

--nathan

04-06-2003, 07:10 PM	#1
84rockinGT Registered Member Join Date: Apr 2003 Posts: 2	Help me please!!!!! Hi guys I have a problem.Just put my motor together today it's a 1981 302.I put a cam with 488 lift and new springs and lifters.I ported the heads out a little.Anyways the darn thing wont start.I have gas and fire.I didnt install the headers yet but it still should start without them I think.I reused the old valves and installed them in the same hole that they came out of.I have an edelbrock intake and a predator carb.The timing i beleve is on.It wont even backfire.Could this be from not lapping the valves when i reinstalled them?I really need some help here.Thanks guys!! Jason

04-07-2003, 08:49 PM	#5
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Check to see if the plugs are wired according to the firing order of the cam. __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

04-09-2003, 02:45 PM	#7
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	Might have slipped the distributor in a couple of teeth off. --nathan __________________ '91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back. Daily Car: '04 Infiniti G35 Sedan 6MT

04-06-2003, 09:59 PM	#2
fiveOguy20 Registered Member Join Date: Sep 2002 Posts: 156	DUDE!! u hafta have ur headers on!!! ur motor will never run good or at all without.. thats ur problem

04-07-2003, 06:02 PM	#3
84rockinGT Registered Member Join Date: Apr 2003 Posts: 2	I've ran other motors before without the headers on.You just cant run them long or you burn up the valves.So sorry bude but that aint it..Any other suggestions?

04-07-2003, 08:26 PM	#4
fiveOguy20 Registered Member Join Date: Sep 2002 Posts: 156	well i've never seen or heard of neone tryin to fire a motor without headers on an thats the only thing that dont sound right in ur post sooo i hope u figure it out man

04-08-2003, 05:32 PM	#6
techsan Registered Member Join Date: Jan 2003 Location: Houston Posts: 20	You should be able to crank the car without the headers, however its not a good idea to run for long, like you said earlier. In your original post you said you thought the timing was on but it wouldn't even backfire, it sounds like it may be 180 degrees off. You can rotate the engine one complete revolution to get it on the intake or exhaust stroke (can't remember which one you need). Then rewire the plugs and check the timing. I know on a 5.0L there is an indicator on the crank pulley that shows Top Dead Center, it may be worth a shot. Hope this helps.