HEI timing curve thingy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

79blazer · 04-25-2007, 08:19 AM

A year ago I discovered the original mechanical timing curve thing, was worn and broke. Then I discovered you cant just buy a OEM type replacement one at most parts stores unless you buy a whole nother brand new $$$$$ distributor too.

So I bought a made in china "high performance" "curve kit" but It was not what I needed. The only way I could get it to not ping was to unplug the Vacuum advance, killing my gas milage.

I didn't worry about that till now. The gas prices are high again at im sure one or two of you have noticed

and I need optimum gas milage now, so sorry for the rant

My question is where can I get a *new* OEM curve kit?? thanks

79blazer · 04-25-2007, 08:50 AM

This is my mechanical advance curve kit. Mr Gasket #929g http://performanceparts.com/part.php?partID=74317

I just read http://www.thirdgen.org/hei Maybe its the vacuum advance that i need. On mine is not adjustable. What is a good adjustable vacuum advance? I have to run 4 degrees retarded or suffer "3 rocks in a coffee can" detonation or drive with the vacuum capped off like I have for the last year.

Question again if you don't want to read all that: What is a good adjustable vacuum advance?

Srubydo1986 · 04-25-2007, 06:37 PM

well im going to put an msd setup under the hood. save a little on gas. Plus i plan to at one time go back to tbi (have no idea why i removed it)

As for your stock curve advance go to a junk year theres plenty to choose from.

MylilBowTie · 04-26-2007, 12:10 AM

Maybe take a look at this link

http://www.73-87.com/7387garage/drivetrain/hei.htm

79blazer · 05-01-2007, 05:06 AM

Thanks. Actually I had that saved that under my favorites

It says to get a "vacuum advance can that is adjustable for both RATE AND TOTAL ADVANCE" IE Crane

Bought this: http://cgi.ebay.com/ebaymotors/Brand...QQcmdZViewItem

This is adjustable just for total vacuum advance as far as I know.

I am sure it is a lot better than having NO vacuum advance, like i have now.

Should I have gotten one that is adjustable for rate too?

MylilBowTie · 05-01-2007, 05:36 AM

http://store.summitracing.com/partde...1&autoview=sku

Summit Racing part number CRN-99600-1 $29.99

Im not sure if it would would be the same without it or not.

Here is a link for the manual also
http://static.summitracing.com/globa.../crn-210g2.pdf

04-25-2007, 08:19 AM	#1
79blazer Registered User Join Date: Aug 2006 Location: Mesa, Arizona Posts: 136	HEI timing curve thingy A year ago I discovered the original mechanical timing curve thing, was worn and broke. Then I discovered you cant just buy a OEM type replacement one at most parts stores unless you buy a whole nother brand new $$$$$ distributor too. So I bought a made in china "high performance" "curve kit" but It was not what I needed. The only way I could get it to not ping was to unplug the Vacuum advance, killing my gas milage. I didn't worry about that till now. The gas prices are high again at im sure one or two of you have noticed and I need optimum gas milage now, so sorry for the rant My question is where can I get a new OEM curve kit?? thanks __________________ 79 Blazer Cheyenne, 2wd 305 3.42 stock 85 Caprice, TBI converted, new 350 crate motor, Monte Carlo SS Wheels, Bilstein shocks,

04-25-2007, 08:50 AM	#2
79blazer Registered User Join Date: Aug 2006 Location: Mesa, Arizona Posts: 136	Re: HEI timing curve thingy This is my mechanical advance curve kit. Mr Gasket #929g http://performanceparts.com/part.php?partID=74317 I just read http://www.thirdgen.org/hei Maybe its the vacuum advance that i need. On mine is not adjustable. What is a good adjustable vacuum advance? I have to run 4 degrees retarded or suffer "3 rocks in a coffee can" detonation or drive with the vacuum capped off like I have for the last year. Question again if you don't want to read all that: What is a good adjustable vacuum advance? __________________ 79 Blazer Cheyenne, 2wd 305 3.42 stock 85 Caprice, TBI converted, new 350 crate motor, Monte Carlo SS Wheels, Bilstein shocks,

04-25-2007, 06:37 PM	#3
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: HEI timing curve thingy well im going to put an msd setup under the hood. save a little on gas. Plus i plan to at one time go back to tbi (have no idea why i removed it) As for your stock curve advance go to a junk year theres plenty to choose from. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

04-26-2007, 12:10 AM	#4
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: HEI timing curve thingy Maybe take a look at this link http://www.73-87.com/7387garage/drivetrain/hei.htm __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

05-01-2007, 05:06 AM	#5
79blazer Registered User Join Date: Aug 2006 Location: Mesa, Arizona Posts: 136	Re: HEI timing curve thingy Thanks. Actually I had that saved that under my favorites It says to get a "vacuum advance can that is adjustable for both RATE AND TOTAL ADVANCE" IE Crane Bought this: http://cgi.ebay.com/ebaymotors/Brand...QQcmdZViewItem This is adjustable just for total vacuum advance as far as I know. I am sure it is a lot better than having NO vacuum advance, like i have now. Should I have gotten one that is adjustable for rate too? __________________ 79 Blazer Cheyenne, 2wd 305 3.42 stock 85 Caprice, TBI converted, new 350 crate motor, Monte Carlo SS Wheels, Bilstein shocks,

05-01-2007, 05:36 AM	#6
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: HEI timing curve thingy http://store.summitracing.com/partde...1&autoview=sku Summit Racing part number CRN-99600-1 $29.99 Im not sure if it would would be the same without it or not. Here is a link for the manual also http://static.summitracing.com/globa.../crn-210g2.pdf __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI



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