New best CFM out of small block Edelbrock heads for me

[pittsburghracer]

Before this set of heads my best flowing set of Edelbrock heads maxed out at 315-318 cfm and it took a ported super victor intake to get me there. (I couldn’t get the air speed slowed down enough. After being very disappointed with this set I changed up the valve job some my local shop did for me. Don’t ask me why but he radiused the intake valve job. I heard this was a big no no and today I proved it. I overlaid a 60-45-30-15 and numbers jumped so these will be going back and I will gladly pay the 64.00 to have him cut new seat angles. At .450 lift these suckers took off. I’m thinking a few more cfm are available

.100———66
.200——-140
.300——-203
.400——-253
.450——-280
.500——-295
.550——-300
.600——-308
.650——-312
.700——-323-325

 

[pittsburghracer]

Pinch is opened to 1.300 and .350 (1.6) Harlan Sharp rockers will be used. Max air speed at the short turn was 380fps. Pinch average was around 325fps. Intake valve size 2.08. Best ET on old best set was 9.74@2880 pounds give or take 30 pounds. Next time it’s on my bench I will try to bolt my Super Victor and modified to work Indy intake on to see what happens.

 

[Garrett Ellison]

 

[pittsburghracer]

 

[yellow rose]

Before this set of heads my best flowing set of Edelbrock heads maxed out at 315-318 cfm and it took a ported super victor intake to get me there. (I couldn’t get the air speed slowed down enough. After being very disappointed with this set I changed up the valve job some my local shop did for me. Don’t ask me why but he radiused the intake valve job. I heard this was a big no no and today I proved it. I overlaid a 60-45-30-15 and numbers jumped so these will be going back and I will gladly pay the 64.00 to have him cut new seat angles. At .450 lift these suckers took off. I’m thinking a few more cfm are available

.100———66
.200——-140
.300——-203
.400——-253
.450——-280
.500——-295
.550——-300
.600——-308
.650——-312
.700——-323-325

Before you get the valve job changed up, flow them backwards. Then flow them backwards again when the non radius valve job is on there. You don't have to post the numbers publicly but it is interesting.

 

[pittsburghracer]

Before you get the valve job changed up, flow them backwards. Then flow them backwards again when the non radius valve job is on there. You don't have to post the numbers publicly but it is interesting.

Probably would see why a radius seat works on an exhaust and not an intake. I made up my mind since I am dropping these off I’m going to have the set of Speedmaster heads in my post cut for 2.05 valves. I have a project they will be going on.

 

[Bobzilla]

Is that a solid aluminum rod blocking off the the old pushrod hole? Did you weld it in there or is that the old trusty JB Weld?
Thanks for all the detailed photos and technical info you share. I will never get around to learning how to do all this, but I love to see a racer doing as much of his own work as he can.

 

[pittsburghracer]

Is that a solid aluminum rod blocking off the the old pushrod hole? Did you weld it in there or is that the old trusty JB Weld?
Thanks for all the detailed photos and technical info you share. I will never get around to learning how to do all this, but I love to see a racer doing as much of his own work as he can.

Yes it’s a tight tap fit in the brass tubing I usually use then glued in like you said with JB weld. Unless I see miracles with the proper valve job, finish work I have to do, and intake bolted on this will never happen again for me. To much work. Lol

 

[pittsburghracer]

 

[rumblefish360]

How much did you raise the roof?

 

[pittsburghracer]

How much did you raise the roof?

Honestly I don’t take measurements. I kinda go by eye and rely on snap gauges and air speed when it’s “go time” I mount them up on these and crank up the stereo. I can turn these end for end and see things from every possible angle.

 

[Johnny Mac]

Before this set of heads my best flowing set of Edelbrock heads maxed out at 315-318 cfm and it took a ported super victor intake to get me there. (I couldn’t get the air speed slowed down enough. After being very disappointed with this set I changed up the valve job some my local shop did for me. Don’t ask me why but he radiused the intake valve job. I heard this was a big no no and today I proved it. I overlaid a 60-45-30-15 and numbers jumped so these will be going back and I will gladly pay the 64.00 to have him cut new seat angles. At .450 lift these suckers took off. I’m thinking a few more cfm are available

.100———66
.200——-140
.300——-203
.400——-253
.450——-280
.500——-295
.550——-300
.600——-308
.650——-312
.700——-323-325

Thats awesome! 28" 4.030??

 

[fishmens67]

Nice !! I still think you could write a book.
We'll call it, Racer John's real world speed secrets.
We want all the secrets not just head porting. all of them. lol

 

[pittsburghracer]

Nice !! I still think you could write a book.
We'll call it, Racer John's real world speed secrets.
We want all the secrets not just head porting. all of them. lol

 

[pittsburghracer]

Thats awesome! 28" 4.030??

Yes sir. Sometimes I crank my bench up to 40” to see if it hangs on. I’m sorry my block is 4.030 but my adapter is 4.015.

 

[Johnny Mac]

Yes sir. Sometimes I crank my bench up to 40” to see if it hands on. I’m sorry my block is 4.030 but my adapter is 4.015.

Thats even better. Great work!
"Mopar" was famous for posting "amazing" flow numbers for their heads...and come to find out they used 4.125 pipes. Cheaters

 

[rumblefish360]

I have a good bit of difference between the numbers I got from 4.125 vs a 4.03!!!

 

[pittsburghracer]

I have a good bit of difference between the numbers I got from 4.125 vs a 4.03!!!

I kicked around making up a 4.100 adaptor for small blocks too as my R3 block is that size. I have two different small block Chevy adaptors, and two big block Mopar adaptors, but I only made one small block ford and Mopar. Heck I’m creeping up to the numbers I have out of my 360-1 heads so I may work on those some when I rebuild my 422.

 

[PRH]

That’s a really nice number out of those heads.

 

[pittsburghracer]

That’s a really nice number out of those heads.

Thank you Sir. Lots of practice on that style of head heads. Lol. A buddy of mine wants to bring his TrickFlow heads over to play around and do so flow and airspeed testing but I gotta get ready for race season before I start that. I am curious though.

 

[yellow rose]

Thank you Sir. Lots of practice on that style of head heads. Lol. A buddy of mine wants to bring his TrickFlow heads over to play around and do so flow and airspeed testing but I gotta get ready for race season before I start that. I am curious though.

You definitely nailed it. I have to ask because I get lost in all these threads, but are these heads getting the RB cam? Either way, I can't wait to see what happens.

BTW, I wish we would have had time to flow the TF heads I had my hands on. But time was at a premium and it didn't happen.

It would be interested to flow and airspeed on them as well.

 

[pittsburghracer]

You definitely nailed it. I have to ask because I get lost in all these threads, but are these heads getting the RB cam? Either way, I can't wait to see what happens.

BTW, I wish we would have had time to flow the TF heads I had my hands on. But time was at a premium and it didn't happen.

It would be interested to flow and airspeed on them as well.

Yes these heads will be going on the 408 that I started the post on. Cast steel Racer Brown roller cam (.660 with 1.6 rockers). You made a comment months ago when I said I was disappointed with the numbers I was seeing and you said even with the pushrod moved over I would probably see a gain over a head with standard pushrod location and went on to use a W2 Head as an example. As much as I was excited to see 325cfm@.700 the .450 number excited the heck out of me. I know when I get the valve job corrected there are a few more cfm hanging there to grab.

 

[rumblefish360]

It seems you’re discovering a secret that no one else knows to getting big numbers out of his head.

 

[K.O. SWINGER]

Thank you Sir. Lots of practice on that style of head heads. Lol. A buddy of mine wants to bring his TrickFlow heads over to play around and do so flow and airspeed testing but I gotta get ready for race season before I start that. I am curious though.

Yes that sounds good I have a pair of heads you can play around with too when do you think you can finish them LOL

 

[K.O. SWINGER]

All kidding aside great work!