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#1 |
Registered User
Join Date: Apr 2009
Location: Weatherford, OK
Posts: 220
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Help after cam and head swap
I swapped out my cam and heads and now when I crank it over to start it, it turns easily and doesn't seem like it's firing. Crank is turning accessories and cam is moving the litters but like I said it turns fast and sounds like there's no fire and/or compression. Any ideas?
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#2 |
Registered User
Join Date: Dec 2005
Location: nebraska
Posts: 136
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Re: Help after cam and head swap
what kind of distributor,points or HEI, 12 volts to dist.?, could be a tooth or two off, check for spark by a screwdriver or plug grounded to block?
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#3 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Help after cam and head swap
Have you been able to get it to run at all? Is it a flat tappet cam? If it is... the more you crank on it without the engine firing so you can break in the cam... you chance wiping a lobe off of the camshaft, and worse yet losing an engine.
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
Last edited by GASoline71; 07-09-2010 at 01:42 AM. |
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#4 |
Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: Help after cam and head swap
are you sure you have spark at the plugs?
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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#5 |
Registered User
Join Date: Apr 2009
Location: Weatherford, OK
Posts: 220
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Re: Help after cam and head swap
Thanks for the help guys. While I was typing this I was at my buddies house (whose shop I use) and his wife was on the phone with her dad. After they hung up it hit me... oh yeah! he owns his own mechanic shop. So we called him back and I started to explain what was going on and he was able to finish my sentence for me. He told me likely I over tightened the rocker arms when I was setting the valve lash thus hanging both valves open all the time. I agree with that cause it seems like i had to tighten them a lot farther this time vs times in the past (I normally do it with the engine running). His suggestion was to set each cylinder to approx zero lash and then set everything while it's running. (i have personally always set them this way in the past but I was worried about having to set them while needing to break in the cam), but that is what I will do. I'll get them to zero lash, start it up, and break in the cam then worry about fine tuning.
I'll update tomorrow. Can't wait to get the thing running. Lunati Voodoo 268 Dur. .489 intake .504 exhaust. Summit racing heads and a 2500 rpm stall. Should liven things up a little bit. |
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#6 | |
Registered User
Join Date: Apr 2009
Location: Weatherford, OK
Posts: 220
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Re: Help after cam and head swap
Quote:
It is HEI and there is spark (backfire through carb) Everything just turns really fast like there is no compression and I think that valves being kept open makes good sense to me. THANKS for all the help guys. |
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#7 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Help after cam and head swap
Check to make sure you don't have your valves adjusted incorrectly. If you tightened the rocker nuts down too much the valves will never close, or open way too soon...
Gary
__________________
'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
Quote:
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#8 |
Registered User
Join Date: Aug 2009
Location: Alden NY
Posts: 2,705
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Re: Help after cam and head swap
It didn't have any compression because the valves weren't closing (rockers adjusted down too much). There are some little clips that you can get that snap on the end of the rockers that help keep the oil from spraying all over, but I've always had some clean up work after setting up a valve train.
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1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7 |
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