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Discussion Starter #1
427 SBC
23 degree Profiler All American X CNC (235cc port) heads
Edelbrock Super Victor 2
285/[email protected] .50 Duration 684/657 lift 1.6 rockers
950 cfm carb
4.56 gears
28" tires
2800lb car
Makes its power starting at 6700 to above 8000

Are these heads too big for a 427 sbc? The reason I'm asking is I had a 6000 stall converter built by a well known business but I can't get the thing to stall over 5200 on the trans brake. The car also doesn't flash from 3800 2 step launch, it just steadily climbs from lauch. Which is what it did with my previous converter also. I told them what was going on and they told me every 427 in their records works well with the same converter or one very similar getting 6000-6200 stall. I'm getting 900-1000 rpm drop during shift so they don't think it would be a good idea to give it more stall. Which I agree with. Which leads me to believe I have no low end torque.
 

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Lot of duration and not much lift.

A bracket 421 I rebuilt used a 275*/280* @ .050" .700"/675", 106 separation. RHS 235 heads 2.08" intake valve. Ported by Jones.

Why did that cam get chosen and by who?
 

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Discussion Starter #5
Lot of duration and not much lift.

A bracket 421 I rebuilt used a 275*/280* @ .050" .700"/675", 106 separation. RHS 235 heads 2.08" intake valve. Ported by Jones.

Why did that cam get chosen and by who?
Herbert Cams recommended it.
 

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You could call Kirk Milner at Bullet Cams. Easy going knowledgeable cam guru. Going to cost you more than a Herbert cam, but how did that work out?

Are you sure your cam specs are 285/295 at .050" lift and not .020" lift?

Everything else in the list you presented makes sense.
 

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Discussion Starter #10
You could call Kirk Milner at Bullet Cams. Easy going knowledgeable cam guru. Going to cost you more than a Herbert cam, but how did that work out?

Are you sure your cam specs are 285/295 at .050" lift and not .020" lift?

Everything else in the list you presented makes sense.
Yeah, I have the card and box it came in, it's definitely @.50
 

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Like others said , a lot of duration. Only way to find out is to put something smaller in the engine.
 

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427 SBC
23 degree Profiler All American X CNC (235cc port) heads
Edelbrock Super Victor 2
285/[email protected] .50 Duration 684/657 lift 1.6 rockers
950 cfm carb
4.56 gears
28" tires
2800lb car
Makes its power starting at 6700 to above 8000

Are these heads too big for a 427 sbc? The reason I'm asking is I had a 6000 stall converter built by a well known business but I can't get the thing to stall over 5200 on the trans brake. The car also doesn't flash from 3800 2 step launch, it just steadily climbs from lauch. Which is what it did with my previous converter also. I told them what was going on and they told me every 427 in their records works well with the same converter or one very similar getting 6000-6200 stall. I'm getting 900-1000 rpm drop during shift so they don't think it would be a good idea to give it more stall. Which I agree with. Which leads me to believe I have no low end torque.
The problem is not the cam. I had a 305 cu in engine with a similar size cam and it ran good. You have other problems. I can’t imagine an engine with that much cu in needing a 6200 converter. That being said it’s probably not the best cam selection and it will need some rpm to run. How did you degree the cam. I would say you need to have it installed at about 102 CL. The cam should also have a 106 love separation. Did you check piston to valve clearance when the engine was assembled. Who built the converter.
 

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I have a brand new small base circle Solid roller 274/282 .460/.450 112+4 cam motion cam for sale would be a good option in that thing. I’d let it go for $220 shipped
 

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Discussion Starter #14
The problem is not the cam. I had a 305 cu in engine with a similar size cam and it ran good. You have other problems. I can’t imagine an engine with that much cu in needing a 6200 converter. That being said it’s probably not the best cam selection and it will need some rpm to run. How did you degree the cam. I would say you need to have it installed at about 102 CL. The cam should also have a 106 love separation. Did you check piston to valve clearance when the engine was assembled. Who built the converter.
I didn't degree the cam. Cam is installed it straight up. Cam card says it's got a 116 lobe center and 112 center line. I don't remember the valve to piston clearance but is was enough that I have nothing to worry with the current lift. Converter is a Coan.
 

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I didn't degree the cam. Cam is installed it straight up. Cam card says it's got a 116 lobe center and 112 center line. I don't remember the valve to piston clearance but is was enough that I have nothing to worry with the current lift. Converter is a Coan.
There you go ...... wide LSA cams are soft down low.
 
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If compression ratio is below 13.5 or so its going to be a turd with that bumpstick.
 
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