Updating Carbs

[Sycraft]

Carbs are great, looking for someone to dial in jetting in Michigan. Prefer dyno tuning

[Sycraft]

Ok, had car calibrated. Steady speed at all RPMs were at a steady 12.5, but when WOT it goes rich. Has .077 secondaries and I did not have any smaller ones to try. I have ordered and assortment of secondary jets to try a few steps smaller to see what results I get. Car runs great overall and starts and pulls hard, other than being Fat WOT. Secondaries vacuum butterflies are opening, had to lighten the springs to allow them to operate. Any suggestions on what Secondary jetting to try first, AFR is at 11.4 at WOT. I have ordered .075,.074,.072,.070

Attached WOT dyno graph, you can see it goes fat quickly. but power for the little 302 is decent as is the torque.

[spdbrake]

Great progress and thanks for posting the info so far.


The Edelbrock tuning guide is pretty accurate. See pages 33-34 for yours.
https://edelbrock-instructions-v1.s3...ning-guide.pdf

The guide shows your secondary jets are already .77 and your not far off a good WOT AFR as it is. So I'd start with the .75

https://help.summitracing.com/app/an...2Ffuel-mixture

[spdbrake]

[quote=Sycraft;1493995]Ok, had car calibrated. Steady speed at all RPMs were at a steady 12.5, but when WOT it goes rich. Has .077 secondaries and I did not have any smaller ones to try. I have ordered and assortment of secondary jets to try a few steps smaller to see what results I get. Car runs great overall and starts and pulls hard, other than being Fat WOT. Secondaries vacuum butterflies are opening, had to lighten the springs to allow them to operate. Any suggestions on what Secondary jetting to try first, AFR is at 11.4 at WOT. I have ordered .075,.074,.072,.070

I'm getting ready to order carbs and jets. Where did you end up on the secondary jet size?
The 1904 has .095 pri, .077 sec jets but since my motor is a 408W I'm thinking I'll start with pair of 1902s which have .095 pri, .095 sec jets. + they're $80 cheaper each as well.

[Sycraft]

never messed with secondaries, runs great overall. I was afraid to mess up the rest of the settings. I do have the secondary alternate sizing though