[Stan Weiss]

Originally Posted by Gach

When CV-1 where first introduced, it was established that they flowed 380 cfm out of the box. Which by all means out flowed a wide port head. Pontiac Dude was doing a pump gas builded. Long story short he ran a 10.20 maybe even 10.10.

I went with Wide Port. Both same size motor. Trust me we went back and forth on this. He hong up on me a few times..and I on him…LOL My second pass with wide ports I went 9.80. I had a set of CV-1’s. But went with wide ports. His thing was he kept saying these heads flow 380 cfm. My wide ports only flowed 362 cfm. But at 750 lift.

Finally when he got his CV-1’s to Gabby..Gabby calls me, he says yeah they flow 380 cfm, BUT! The air speed in the port is only 252… so to make up for low air speed he’s going to need a minimum of 275-285 duration. My cam is or was 265/276 hey it was a learning process for both of us, but I already new what air speed was. When Dude would shift that thing into second gear the rpms would drop almost 1000 rpms. Its like the motor wouldn’t recover.

Of crouse theres allot more to it then just air speed in the port.

Stan

[Gach]

Originally Posted by Stan Weiss

Stan

Tolling Stan

[Gach]

Its funny you two make way to obvious.

[Jay S]

As long as I can get my snow tires to hook up. I think am good, no need switch too round ports yet.

One of the guys on here…790HP@6700, 689TQ@4900…that was just NA, but that wasn’t enough so he sprayed it with IRC.. a 400 shot of NOS, 461 with 325CFM KRE D ports…Jut saying, that is a pretty darn efficient port for that much HP and only 325CFM.….not mine, but I have a some of his parts on my engine. He has since switch to 528 cid high ports and is knocking on 1000HP, on top of that he has that NOS system. Yikes!

Can’t argue with the round port headers are better and much easier to work on. If us D port guys only knew better…

[77 TRASHCAN]

Originally Posted by Jay S

As long as I can get my snow tires to hook up. I think am good, no need switch too round ports yet.

One of the guys on here…790HP@6700, 689TQ@4900…that was just NA, but that wasn’t enough so he sprayed it with IRC.. a 400 shot of NOS, 461 with 325CFM KRE D ports…Jut saying, that is a pretty darn efficient port for that much HP and only 325CFM.….not mine, but I have a some of his parts on my engine. He has since switch to 528 cid high ports and is knocking on 1000HP, on top of that he has that NOS system. Yikes!

Can’t argue with the round port headers are better and much easier to work on. If us D port guys only knew better…

Do you run studs in your snow tires???

[Steve C.]

On the subject of the intake/exhaust flow ratio. Here is what Harold Brookshire from UltraDyne said on the subject within a post here on PY:

"On most cylinder heads, whenever I have around a 75 percent exhaust-to-intake ratio, I use an 8 degree bigger exhaust cam.
If the ratios under 70 percent, I use 12 degrees, and around 80 percent, only 4 degrees.
Whenever the ratio gets around 85 percent, single pattern cams seem to work as good as anything."

BUT this was not specific to Edelbrock heads at the time. That could be a general statement from him with factory heads in mind.

.

[Steve C.]

And another subject that relates to the type of Edelbrock cylinder head. The older style combustion chambers or the heart shape.

How combustion chamber design relates to engine performance

https://www.motortrend.com/how-to/02...stion-chamber/


.

[Formulas]

Originally Posted by 77 TRASHCAN

Do you run studs in your snow tires???

Nice sparks on burnouts

[Jay S]

Originally Posted by 77 TRASHCAN

Do you run studs in your snow tires???

Sure, it was -17 here last week, so the studs work good for the lake ice drags. Plus the cold lake bed is where the drink and drive daily thing works good together too, keeps your senses dulled some so you don’t notice the cold. Just got to remember to steer clear of those ice fishing huts.

[i82much]

Originally Posted by Jay S

Sure, it was -17 here last week, so the studs work good for the lake ice drags. Plus the cold lake bed is where the drink and drive daily thing works good together too, keeps your senses dulled some so you don’t notice the cold. Just got to remember to steer clear of those ice fishing huts.

is there a good aftermarket coffee maker for a 64-67 A-body? I am having a really hard time finding an original and I just can't see swinging by Starbucks every time I wanna go ice racing ...