1963 stock 250hp 4 speed carb question

[Frank D.]

I've rebuilt my WCFB 3501S exactly to spec and it idles and pulls strong (for a mouse motor).
If I nail it at low RPM she'll buck a bit and then take off like a shot -- no problem at higher RPMs.
Is that just the way it is ? Accel pump has super double shot of juice when blipping the linkage, float level/drop is perfect, etc..

I know my dual quad '61 has to be 'up' on the Duntov cam for best WOT performance. So, am I just being picky ?

[Joe R.]

Re: 1963 stock 250hp 4 speed carb question

Frank,

If I was having that trouble I would advance the timing a couple of degrees at a time and check it each time I advanced the timing. Don't advance it enough to get pinging when you push on the accelerator. If it pings just back off a couple and try that.

JR

[Frank D.]

Re: 1963 stock 250hp 4 speed carb question

Frank,

If I was having that trouble I would advance the timing a couple of degrees at a time and check it each time I advanced the timing. Don't advance it enough to get pinging when you push on the accelerator. If it pings just back off a couple and try that.

JR

Easy enough, I'll try it tomorrow... Thanks Joe...

[Harry S.]

Re: 1963 stock 250hp 4 speed carb question

JR has a great suggestion. I'm running my 250 hp 63 about 11 degrees advanced.

[Timothy B.]

Re: 1963 stock 250hp 4 speed carb question

Frank,

FWIW, to much accelerator pump shot can make it feel lazy.

[Frank D.]

Re: 1963 stock 250hp 4 speed carb question

JR has a great suggestion. I'm running my 250 hp 63 about 11 degrees advanced.

Lars setup my original distributor last year for 16* initial (long story) and I ran that way for a while but backed off to about 12 in January.
Think I'll try bumping it back up to 16* - it never pinged that high...can't hurt.

I don't think my pump shot is excessive but I'll look at that too...not much adjustment in that arena on the WCFBs though.

[Frank D.]

Re: 1963 stock 250hp 4 speed carb question

Bumping up the timing definitely helped; I'm at 16* initial (vac advance plugged); no pinging under load and no 'trailer-hitching' at cruise.

Still have the tiniest bit of bog at WOT from cruise (none at idle). Don't know if I should live with it or try to goose the timing up another degree or two.

[Frank D.]

Re: 1963 stock 250hp 4 speed carb question

Slight carb adjustments and advancing the timing worked superbly - thanks JR...

[Stan E.]

Re: 1963 stock 250hp 4 speed carb question

My first thought was the same.