348 To 380 Dyno results

[Tim]

To your defense,you likely followed Edelbrock;s instructions which says to hook the advance ported.Most Chevrolet engines prefer the vacuum adv.hooked up to manifold,like they were when they left the assembly line.

having that on the other side would it have made a difference on the dyno?

 

[Gofish]

having that on the other side would it have made a difference on the dyno?

Shouldn’t matter on the dyno , because vacuum is low at wide open throttle and the vacuum advance wouldn’t be adding to total advance.

 

[Don Jacks]

So how did the test drive go?????????

 

[Tim]

Don, Just got it off the stands. Had a lot of things to button up and down pipes to put on. Rest of the exhaust Goes on tomorrow. What should it idle at for RPM?

 

[Tim]

Well.....it’s done (except mufflers tomorrow). Took it for a drive around the block and I’m not sure I’ve drove a car with that much torque and throttle response. My 2018 Silverado is lazy compared to this!!

 

[Don Jacks]

Don, Just got it off the stands. Had a lot of things to button up and down pipes to put on. Rest of the exhaust Goes on tomorrow. What should it idle at for RPM?

700 in drive should work,Tim

 

[Tim]

Ok that’s what it is, and yes I found the idle screw!

 

[409newby]

The valve covers look great, blends in with the firewall,inner fenders, etc

 

[Don Jacks]

Did setting the vac.adv.up to manifold vacuum clean up the "flatness" of the engines idle? The lope should be noticable.

 

[Tim]

700 in drive should work,Tim

Did setting the vac.adv.up to manifold vacuum clean up the "flatness" of the engines idle? The lope should be noticable.

Yes it did Don, made it smoother and more consistent.

 

[Tim]

The valve covers look great, blends in with the firewall,inner fenders, etc

Thanks, it’s what I wanted. Just something different.

 

[Don Jacks]

That engine looks like it was born in there.You certainly did a great job. Once you learn to drive it you'll be hooked on W power forever.

 

[Tim]

That engine looks like it was born in there.You certainly did a great job. Once you learn to drive it you'll be hooked on W power forever.

Thanks Don, it wouldn’t have happened without all your help. And....I’m already looking for another block to build one!!

 

[Don Jacks]

I just provided a "Recipe",you were the "Chef" that made it happen.

 

[Tim]

Had the car out for its first torment after the exhaust was on. And as expected a few issues, leaking rad hose, easy fix, power steering line, easy fix,
Ticking on thr drivers side. Unknown. Loose rocker maybe? I’ll take the cover off and have a look
Carb is running really rich at idle. Not sure how to adjust that.
bit of blue smoke out the back. Assuming rings need to be seated

 

[DonSSDD]

Blue smoke is normal, drive it like you stole it. BB fuel pump may be putting out too much pressure overloading the carb.

 

[427John]

Is it the same carb as used on the dyno run?When you adjusted idle speed did you increase it or decrease it?If you decreased it is it possible you made the idle circuit active and now you need to adjust idle mixtuire?

 

[Tim]

Is it the same carb as used on the dyno run?When you adjusted idle speed did you increase it or decrease it?If you decreased it is it possible you made the idle circuit active and now you need to adjust idle mixtuire?

Yes John same carb, really didn’t have any idle time on the dyno. I adjusted it up and it’s a bit erratic at times. Especially when it’s in drive. At parked idle it’s ok until I give it gas and it stays at 1000-1200. Give it a shot again and it comes down. Are the 2 mixture screws different? Or just control different things.

 

[Tim]

Blue smoke is normal, drive it like you stole it. BB fuel pump may be putting out too much pressure overloading the carb.

ill put the regulator on it and check pressure. Not sure I have a low pressure pump.

 

[La Hot Rods]

Maybe you need a little more return spring.
The idle mixture screws are in the front of the carburetor facing forward. Turning in will lean the idle mixture and out will enrich the idle mixture. The mixture screws only control the idle mixture.