recurve

[aerie1761]

How do I recurve my HEI on my 81vette

 

[GerryLP]

The advance curve values are programmed into the computer chip. Chip companies can provide you with a modified version, but its a bit on the high side ($300 - $400).

 

[MaineShark]

As Gerry says, you'd need a new computer chip.

If you switch to a pre-computer distributor, then the advance curves are a function of springs, weights, and such. You can buy kits of all the parts needed to change to a better curve. I seem to recall that it costs something like $25 or so.

Joe

 

[Jack]

You can get into a brand new HEI (first generation-style having both centrifugal & vacuum advances) that is complete and with performance curve ... about $150 for a taiwan copy ... or USA from GM about $225. A good used one from junkyard about $25 ... rebuild parts & curve kit'll keep the whole shebang under $100.
JACK:gap

 

[Bob Chadwick]

Lars has a complete kit for under $45. Email him and he will respond.

 

[Rodney Gold]

I have done recurving and unless you have a problem with sticky weights or bad springs , it doesn't help a whole lot in terms of acceleration, ET , driveablity etc.
Most mild performance motors will be making power at more than 3000 rpm anyway and by that rpm you should have full advance all in .
IMHO the hassles, cost and fiddling of reprogramming an advance curve is not worth the performance increase if the car is working well.