upgrade?!?!?!?!???

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Apr 3, 2006 | 10:11 PM

biggfrank1963

Thread Starter

New User

Joined: Oct 2004

Posts: 12

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upgrade?!?!?!?!???

i just installed a edelbrock performer 390, performer plus cam, and double chain timing set on my 1976 360 engine. it sits in a 1967 f-250 truck. after i installed everything, had to set the timing to 20* advanced just to keep the engine running. i also made sure the #1 piston was on compression stroke at TDC, and the distributor was pointing at #1 on cap. the spec's of the cam are lift at cam: intake .265" exhaust .280"
lift at valve: intake .050" exhaust .480"
lobe seperation 110*
intake centerline 105*
when i took the truck for a test run, it had no power at all.
any help would be appreciated

Apr 3, 2006 | 10:56 PM

jj22ee

Junior User

Joined: Aug 2005

Posts: 95

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have you checked your vaccum. What is it reading is it holding steady. I had a vaccum leak on one of my cars and to correct it I had to adjust the timing alot higher until the leak was fixed.

Apr 3, 2006 | 11:18 PM

FalconStng

Elder User

Joined: Feb 2005

Posts: 669

Likes: 1

There have been several instances of problems getting the intake manifold to seal properly when changing from stock to an aftermarket aluminum one. I'm one of the ones that had problems. If you don't get a good seal this could be part of your problem as you'll be losing a lot of vacuum and you could also potentially be pulling in oil as well. The stock bolts are usually too long for the aluminum intakes and will bottom out before the intake is really tight...you need to use washers or shorter bolts. It's also important to use the proper gasket. Edelbrock recommends the Felpro printoseal...this is different than a standard felpro gasket. A lot of people also recommend Mr. Gasket. There are other possible reasons for your problem....how did you break the cam in?

Good Luck

Tracy

Apr 5, 2006 | 10:16 PM

biggfrank1963

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Joined: Oct 2004

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i did not do a vacuum check. but i have no vacuum leaks. when i ordered my parts from summit, the already sent me all the correct gastkets.

Apr 6, 2006 | 08:22 AM

Putt

Posting Guru

Joined: Jul 2003

Posts: 2,232

Likes: 1

From: Colville, Washington

Sounds like the cam might be installed one tooth retarded. It is not large enough to cause an idle problem.

Tracy brings up a valid point-was(is) the cam broken in properly????