[brngrhd]

more info on the dyno day

room temp 108*F 48% humidity baro reading 14.12 ????
autolite 3924's gapped at .038
correction factor was 85%

 

[GRN69CHV]

I was running the AR3924's also (as spec'd by Dart). I was just on the threshold of detonation in hotter temps. Just swapped to the AP3923 (gapped at .040 - I think). One heat range cooler and a platinum tip. Fires up almost instantly and seems to run a little smoother.

 

[brngrhd]

I was running the AR3924's also (as spec'd by Dart). I was just on the threshold of detonation in hotter temps. Just swapped to the AP3923 (gapped at .040 - I think). One heat range cooler and a platinum tip. Fires up almost instantly and seems to run a little smoother.

whats your compression?

 

[GRN69CHV]

10.2/1 Should clarify this. I am running about 28-30* initial / 38* total. Have a 8* vac adv can. Motor was pinging on 92 octane with at lite throttle/high vac with the vac advance connected. There was notably less pinging with the AP3923 plugs (even though it did still ping). Currently have the vac advance disconnected. Timing comes in fast, so with the 3000 converter, figure the motor pretty much sees 38* timing at anything above idle. I think the thing with plugs is, if the ring seal is really good and the carb is set up correct, you shouldn't need as hot a plug. Dart only lists a 3933 for racing. Look at the Autolite site, the 3933 is significantly lower heat range than a 3923 or 3924.

 

[brngrhd]

wounder if mine will ping.... me motor was tested in 108* room temp 17 intial 39 total all in before 3000 i did not have vac advance setup don't know if i will either.... may just lock it out at 38-39... i do have ceramic coated pistons don't know if that will push more heat out.....

 

[rchevellea]

looks like some good numbers...now get it in and have some fun with it!!!!!

 

[Chemical Guy]

I am running a 12 bolt with 3.31's and my converter is a 10 inch that only comes in at about 2500 so I think my 60 foot times will leave a little on the table. I also don't really want to go faster than 11.50 because of all the safety mandates once you go that low. Don't want a cage, too hard to get the kids in/out of the back. My baby girl wants to take the Chebelle when it's raining and snowing and gets pissed when I don't. I will post numbers next weekend.

 

[GRN69CHV]

Exact same situation here. 11.50 is it. Although, probably could get away with running faster on Friday night street nights at Cecil. But, with no track prep, it's a challenge to even get into the 11's as slick as the track gets.

 

[65 Imp SS]

Looks real good, love the six pack. quick question on your torq. At 4600rpm made 532# and dipped then climbed to peak 543# at 5500rpm. What would cause it to dip?

 

[Rmchevelle]

Warning: This is an Old thread!!!




brngrhd, Any chance you could repost the pics/scans that no longer show up? ...or email them to [email protected]

Thanks a bunch!

 

[brngrhd]

you bet

took this intake off

and put this one on and the motor really liked it

never did spray the car and now it is gone traded it for a 1970 nova

 

[Rmchevelle]

That's great! Thanks for reposting those. :thumbsup: