Solid Flat Tappet Valve Springs

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Illahe

Mopower
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looking for feedback on solid flat tapper vale springs. I currently run beehive 365 ci 135/335 on a 238/238 .560 lift but it doesn’t pull past 5400. Stepping up to a 12:1 414 this season 272/280 .590 any suggestions.
 
Illahe said:
looking for feedback on solid flat tapper vale springs. I currently run beehive 365 ci 135/335 on a 238/238 .560 lift but it doesn’t pull past 5400. Stepping up to a 12:1 414 this season 272/280 .590 any suggestions.
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Something is terribly wrong right there.......
 
List everything you know about the combo. I have mine in a note on the phone. I just copy and paste when asked. I have a “somewhat” similar cam. You have more intake and exhaust flow than I do, but I have more head flow,CI,and compression and mine is like the DEVIL! “Come on, it’s only a couple more rpm! It will be fine! 7000 is the new 5000! Whimp!”
 
furrystump said:
Fuel pressure?
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That's what my machinist suggested. I run a decent mechanical pump. I believe its about 90 gpm. 26/10/15 slick 4 speed, 3.55/ 3.91. 4.30 no exceptional change in 60'. I swapped to a 11.5;1 360 and a Schneider grind 246/.510 solid on 110 with 308 heads and same spec valve springs. 1.94 1.6 valves and it comes on a lot stronger. Shelfing this car and working on a 1984 Daytona for this season.
 
How is the geometry on the rockers ?
If it's wrong you might not be getting all the lift at the valve.
Have you verified this ?
Too much or not enough fuel pressure usually has the engine breaking up misfiring.
 
The sweep across the valve tip looks good. I spoke with Howards today and they said 335# open was not enough. The engine doesn't miss or break up at rpm. Tech sat its beginning to flat and cant control the cylinder pressure.
I'm looking for a dual spring with 1.800 installed 360 -375# open pressure. Along with retainers for 11/32 valve with 10* keepers. Hughes has a spring from Pac but the retainers say +.100.
 
Illahe said:
The sweep across the valve tip looks good. I spoke with Howards today and they said 335# open was not enough. The engine doesn't miss or break up at rpm. Tech sat its beginning to flat and cant control the cylinder pressure.
I'm looking for a dual spring with 1.800 installed 360 -375# open pressure. Along with retainers for 11/32 valve with 10* keepers. Hughes has a spring from Pac but the retainers say +.100.
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Okay good, sounds like you're getting it figured out.
 
Illahe said:
The sweep across the valve tip looks good. I spoke with Howards today and they said 335# open was not enough. The engine doesn't miss or break up at rpm. Tech sat its beginning to flat and cant control the cylinder pressure.
I'm looking for a dual spring with 1.800 installed 360 -375# open pressure. Along with retainers for 11/32 valve with 10* keepers. Hughes has a spring from Pac but the retainers say +.100.
Click to expand...
I run a trickflow dual spring in my SFT cammed 360 7k no problem TFS-16893-16 installed at 1.80
 

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I’m running PAC 1903’s at 1.80 on this cam. Pulls through 7000 rpm

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135 on the seat 340 over the nose
 
My wide lobe separation helps with the exhaust manifolds.
 
furrystump said:
My wide lobe separation helps with the exhaust manifolds.
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I've got a 340 on the stand for my sons 72 dart. I'm hoping the manifolds can take a solid 230/230 .489 on 108, but I'm having second thoughts after reading you et!
 
Last weekend it ran a 11.24 at 119 with a 1.60 60’, but was with a M&H DOT race tire, not the required F70-14 redline So it doesn’t count, but the M&H DOT tire doesn’t make the car quicker. Just easier to drive. I believe a high 11 teen is possible with a redline tire. Replacing the radiator, because of a small leak. Should lose some more nose weight. Going aluminum.
 
furrystump said:
Last weekend it ran a 11.24 at 119 with a 1.60 60’, but was with a M&H DOT race tire, not the required F70-14 redline So it doesn’t count, but the M&H DOT tire doesn’t make the car quicker. Just easier to drive. I believe a high 11 teen is possible with a redline tire. Replacing the radiator, because of a small leak. Should lose some more nose weight. Going aluminum.
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Which tire are you using??
 
In competition F70-14 redline lines, last week testing was a 14” M&H DOT Musclecar tire. My limited converter flash, (3500) doesn’t let me use all the M&H tires ability. Which works out just fine for me. More apples to apples, just more repeatable.
 
In competition I have to run this tire. Testing I run the M&H

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I was required to run a “race” tire on drag week. It was the only 14” that would work.
 
My 360 has a Howards flat tappet with 1.6 rockers, Currently I have a Crane dual spring, 150lbs on the seat and around 400 open. My camshaft is a little bigger though, from memory it was around 0.690" valve lift and 266-276 @ 0.050"
It makes peak power at 6900 RPM, turns to over 7000
 
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