Edelbrock Heads
- Thread starter hillperformance
- Start date
hillperformance
Member
John,
That would be great, I'll post the results here as that would be a good baseline.
Thanks.
Calvin Hill
Hill Performance
27992 W. Route 120, Unit #145
Lakemoor, IL 60051
708-250-7420
A ggod 690 will flow around 255-260. You need to use a raidiused entry a little thicker on the top side of the port.
Wow..... that makes my 817's with a bowl clean up, 2.06 valves with a back cut look like a pretty good set of heads...... they flowed 245 @.600
I'll bet the 333's that are being done out there would do really well. If SD Performance wasn't so busy I'd have that C & C program for the 333's. I really don't think it's going to happen. He's just swamped with work and my 333's sit on the shelf.
my opinion........ For a 400 HP +/- I think a set of 817's or 333's are the way to go.
Dave
And another thing to consider is a set of 333s can be had for $150-200. Hard to beat that initial cost. Though its been discussed here a few times once you add in the 30-40 hours of porting and clean up time, all the parts to make the 333s usable (rotator deletes, screw in studs, valves, springs, retainers, guides, seals, machining cost etc) you don't come out much cheaper than a set of Edelbrocks. The satisfaction of knowing YOU ported the heads however is pretty cool. And if your motor makes good power, you can tell people, "I ported these heads...." If the motor doesn't perform, just keep the hood closed
I agree on the 817's Dave. After quite a bit of sitting on the fence about reusing them, I had my 817 heads rebuilt with the 2.075 intake valves, new guides and the 7/16 studs. My guy had a really nice cutter that he opened up the bowls with. Looks like a CNC head job. I decided I would rather keep the smaller valves for the low end torque than the high rpm flow numbers from bigger valves. I doubt if this motor will ever see 6 grand. Just a really nice street motor.
Leo
333s
It would be nice to know what a stock set of 333s flows as well. lot of 'em around at low cost.
As noted, modifying them costs just as much as new aluminum does!
TomK
It would be nice to know what a stock set of 333s flows as well. lot of 'em around at low cost.
As noted, modifying them costs just as much as new aluminum does!
TomK
Skip FIx
Well Known Member
Edelbrock with a slightly larger intake valve unported
.2 138
.3 210
.4 246
.5 259
.5 269
.7 274
exhaust
.2 98
.3 135
.4 168
.5 190
.6 201
.7 209
ported with the intake on and the longer runner, slightly better the short runner
.2 168
.3 228
.4 265
.5 285
.5 295
.7 297
exhaust peaks at .7 were 263 and 270 depending on center or end port
.2 138
.3 210
.4 246
.5 259
.5 269
.7 274
exhaust
.2 98
.3 135
.4 168
.5 190
.6 201
.7 209
ported with the intake on and the longer runner, slightly better the short runner
.2 168
.3 228
.4 265
.5 285
.5 295
.7 297
exhaust peaks at .7 were 263 and 270 depending on center or end port
hillperformance
Member
John,
Bring a truck load of stuff, it would be good to post results from back to back testing.
Calvin Hill
Hill Performance
708-250-7420
hillperformance
Member
How much horsepower has been made with these heads? With that amount of air flow, 800 + should be possible.
Calvin Hill
Hill Performance
708-250-7420
hillperformance
Member
Anyone willing to post HP numbers from Bob's heads?
Thanks.
Calvin Hill
Hill Performance
708-250-7420
Thanks.
Calvin Hill
Hill Performance
708-250-7420
There's a guy that I race with that got 762 hp out of a 476 ci 409 with Bob Walla's heads. When the heads were ported they raised the port. I don't know what size valves they used. I know they did use one of Lamar Waldens intakes with a single carb.
Bob's heads are a little taller than the Edelbrocks and there is more room to raise the port so I'm guessing that would give them more flow on a maxed out porting job.
Bob's heads are a little taller than the Edelbrocks and there is more room to raise the port so I'm guessing that would give them more flow on a maxed out porting job.
hillperformance
Member
Any updates?Hopefully I will have some numbers soon.
Just waiting for my oil pan and then it is off to the header builder.
My flow #'s were really similar on the intake side. On the exh side I believe I had quite a bit more. I'll dig out my flow sheet and post my #'s
Fred
Thanks.
Calvin Hill
Hill Performance / Mondello Tech Center
708-250-7420
fastfreds
Well Known Member
Okay, I dug out my info;
Int/exh
.100 86 90
.200 163 153
.300 237 200
.400 298 232
.500 334 261
.600 343 287
.700 352 292
This if with a sheet metal tunnel ram style intake base and no pipe on the exhaust. I don't know how everyone else is mtg their heads to the flow bench but I made my own adapter. It duplicates the angles. bore size (4.350) and upper cyl relief on my engine. I'll post a pic if I can figure out how.
Fred
Int/exh
.100 86 90
.200 163 153
.300 237 200
.400 298 232
.500 334 261
.600 343 287
.700 352 292
This if with a sheet metal tunnel ram style intake base and no pipe on the exhaust. I don't know how everyone else is mtg their heads to the flow bench but I made my own adapter. It duplicates the angles. bore size (4.350) and upper cyl relief on my engine. I'll post a pic if I can figure out how.
Fred
Would you learned gentlemen help me with my amateur port endeavor on 690 heads. Back in the 1970s I did a port match, short turn work & a little rounding on the valve boss area. Also I blocked off the exhaust crossover (see picture). The old 409 powered 55 T-Bird did a best of 12.55 @ 110 with these heads back in the 70s. The truck 409 in the T-Bird now is fun and got me to Thompon the last 2 years but I long for the power of the previous engine that had these heads. I want to do more to these 690 heads around the valve guide boss area but need advice on where/how much/exactly what to do.
I looked on the web & found some good info but nothing 690 specific. On this site I found where Ronnie said there was a lot of info here &
he was correct. I found several threads and a thread "Die Grind Work" by Ray and he has pictures of what he did around the valve boss area & I am trying to do the same to my heads. My car won't run mid 11s like Rays but back into the 12s would be nice.
Questions:
>What is the purpose of the raised area on the intake roof between the port opening and the valve guide boss? Edelbrock or BWR heads have these?
>Does anyone have pictures of valve guide boss area of Edelbrock heads?
>Should I consider the intake ports of my job satisfactory (one done - 7 to go) or is there more to be done?
>Same question on my exhaust work - I think that I am at the point of diminishing returns.
Any help appreciated.
I looked on the web & found some good info but nothing 690 specific. On this site I found where Ronnie said there was a lot of info here &
he was correct. I found several threads and a thread "Die Grind Work" by Ray and he has pictures of what he did around the valve boss area & I am trying to do the same to my heads. My car won't run mid 11s like Rays but back into the 12s would be nice.Questions:
>What is the purpose of the raised area on the intake roof between the port opening and the valve guide boss? Edelbrock or BWR heads have these?
>Does anyone have pictures of valve guide boss area of Edelbrock heads?
>Should I consider the intake ports of my job satisfactory (one done - 7 to go) or is there more to be done?
>Same question on my exhaust work - I think that I am at the point of diminishing returns.
Any help appreciated.