Author Topic: Preformer rpm  (Read 99 times)

Offline t!mortician

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Preformer rpm
« on: November 17, 2020, 05:37:33 PM »
So I have a 1986 chevy short bed with the eddelbrock preformer rpm top end kit on a 78 454 bored .30 over 9.5 to 1 compression cam specs are  Duration Advertised   335° Intake/329° Exhaust
Duration @ .050''   236° Intake/245° Exhaust
Lift @ Valve   .625'' Intake/.639'' Exhaust
Lift @ Cam   .368'' Intake/.376'' Exhaust
Lobe Separation Angle   112°
Intake Centerline   109°
Intake Timing @ .050"   Open 6° BTDC
Close 51° ABDC
Exhaust Timing @ .050"   Open 54° BBDC
Close 11° ATDC
 Also I have 9 to 11 lbs of vacuum at idle
Carb is 17080212. I am thinking recipe # 2 out of the book but kinda new. If there is a thread on this already  I can't find it so any help would be great

Offline t!mortician

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Re: Preformer rpm
« Reply #1 on: November 17, 2020, 09:46:39 PM »
Also headers and 3 inch Exhaust. I am going to order ax rods, .035 needle and seat, full taper primary rods to .026 tip, cam and spring set, and B secondary hanger. I will follow recipe 2 and post how it goes any comments or suggestions are greatly appreciated

Offline Cliff Ruggles

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Re: Preformer rpm
« Reply #2 on: November 19, 2020, 03:15:29 AM »
You will find that carb already pretty generous for idle fuel.  We can discuss the specifics when you call in the parts order.  I'm here 7am-4pm, M-F EST...tks......Cliff

Offline t!mortician

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Re: Preformer rpm
« Reply #3 on: November 23, 2020, 03:52:50 PM »
Ok thank you I will give you a call tomorrow 🙂