proper head size motorhead style
Thread Starter
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
proper head size motorhead style
331 cu. 553 hp at 7600 pump gas. moderate ramp rate solid roller for longer valve trane life 61 vette. 235 runner, 23 degree head. 950 ultra holley, motown single plane.
Last edited by Little Mouse; May 23, 2015 at 09:39 PM.
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Used to help my buddy with a 287 cu/in Comp Eliminator Camaro with heads that were HUGE like that.....put a 50LB flywheel on it and Rev the bitch to launch RPM.....The Dana 60 R&Ps lasted about 45-70 runs in that car......Street/Strip car.....330 cu/in with 235cc heads.?....not how I would build one but, what's a guy like me know......
Thread Starter
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Its in engine masters. He used a factory block with nodular splayed caps. Heads are CNC brodix, 11.2 compression. Shaft rockers with 1.7 ratio. Lift is only 650 so the lobe lift can't be much. The cam has moderate rate to make it easy on his valvetrane. Now he is doing 7600 thats the only way you can make any power with a small engine. 258/264 .050 105 lsa, Isky cam
You should look at the size of runners used on 6500 rpm 400, 406 engine masters engines, 1050 size dominator carbs the norm and remember its not just a peak horsepower deal it has to make strong wide torque everywhere and average tq and hp to win it. Not just trying to impress someone with a top end hp number.
Every time i see a 427 build even with 245 afr heads they fall flat on there face at about 6700.
You should look at the size of runners used on 6500 rpm 400, 406 engine masters engines, 1050 size dominator carbs the norm and remember its not just a peak horsepower deal it has to make strong wide torque everywhere and average tq and hp to win it. Not just trying to impress someone with a top end hp number.
Every time i see a 427 build even with 245 afr heads they fall flat on there face at about 6700.
Last edited by Little Mouse; May 24, 2015 at 09:33 AM.
Thread Starter
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Everything does not have to be put in the same box as to what an engine might do on a drag strip or from stop light to stop light. This engine without a lot of gearing could be a lot of fun out on twisty roads like outside of Little Rock where i once lived. When a car is moving already at 65 mph your not moving a lot of dead weight from rest. The most boring type of engines for this type of driving are all just torque and no horse power. A corvette is a sports car its one of the worst cars you could pick for drag racing. Not really light to short of wheelbase.
Last edited by Little Mouse; May 24, 2015 at 11:54 PM.
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Its in engine masters. He used a factory block with nodular splayed caps. Heads are CNC brodix, 11.2 compression. Shaft rockers with 1.7 ratio. Lift is only 650 so the lobe lift can't be much. The cam has moderate rate to make it easy on his valvetrane. Now he is doing 7600 thats the only way you can make any power with a small engine. 258/264 .050 105 lsa, Isky cam
You should look at the size of runners used on 6500 rpm 400, 406 engine masters engines, 1050 size dominator carbs the norm and remember its not just a peak horsepower deal it has to make strong wide torque everywhere and average tq and hp to win it. Not just trying to impress someone with a top end hp number.
Every time i see a 427 build even with 245 afr heads they fall flat on there face at about 6700.
You should look at the size of runners used on 6500 rpm 400, 406 engine masters engines, 1050 size dominator carbs the norm and remember its not just a peak horsepower deal it has to make strong wide torque everywhere and average tq and hp to win it. Not just trying to impress someone with a top end hp number.
Every time i see a 427 build even with 245 afr heads they fall flat on there face at about 6700.
Thread Starter
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
What i don't understand in his build it mentions that the cam is a moderate rate not drag race it says. Has what i would consider no where near extreme lift .650. no extreme rpm. But it says he used close to 800 open pressure valve springs.
Last edited by Little Mouse; May 25, 2015 at 05:09 PM.
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Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Unless his cam is .650" lift and that would put him at near .750" lift with 1.7 rockers but still 800# open is way too much.
Thread Starter
Le Mans Master
Joined: Apr 2006
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Custom Isky was ground featuring 258/264 at .050. The cam lobe chosen are a moderately aggressive design that are not as brutal on the valvetrain as a violent drag racing lobe, and they are very controllable at high rpm with moderate spring loads
Under the valve covers are a set of crower shaft mounted rockers featuring a 1.7 ratio, producing .650 lift from the Isky Cam.
Manly springs and lightweight tool steel retainers. The spring loads were substantial with 280 lb seat and nearly 800 pounds at peak lift.
He's using ferrea valves and a set of offset crower lifters that use bushings.
all this money is tied up in a new block he bought back in the early 70s and used it for decades in his 61 vette. He has Milidon nodular caps added to it. Then he uses a factory steel forged crank, Knife edged, cut 010/010 and re nitrided. CP pistons ( not Cheap either ) 6.00 inch rods brand i don't know of, RPM international.
Under the valve covers are a set of crower shaft mounted rockers featuring a 1.7 ratio, producing .650 lift from the Isky Cam.
Manly springs and lightweight tool steel retainers. The spring loads were substantial with 280 lb seat and nearly 800 pounds at peak lift.
He's using ferrea valves and a set of offset crower lifters that use bushings.
all this money is tied up in a new block he bought back in the early 70s and used it for decades in his 61 vette. He has Milidon nodular caps added to it. Then he uses a factory steel forged crank, Knife edged, cut 010/010 and re nitrided. CP pistons ( not Cheap either ) 6.00 inch rods brand i don't know of, RPM international.
Last edited by Little Mouse; May 25, 2015 at 08:18 PM.
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From: Millington Illinois
St. Jude Donor '08-'09
He is running high RPM, wants total valve control and maximum obtainable power at all RPM and durability long term is not a consideration.
Thread Starter
Le Mans Master
Joined: Apr 2006
Posts: 5,403
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It makes power to 7600 even if he runs it to 8,000 rpm that's not that high rpm and he only has .650 lift. Zero need for springs anywhere near that stiff.
The article or plan starts out cam wise making some sense. Pick a non drag racing less aggressive rate cam with very reasonable amount of lift for a hot street engine. Then he puts 800 lb open springs on it. My opinion that's crazier then using the 235 size head.
I put this article deal up mostly to tease motorhead a bit to see if he thought these heads were big enough for this street bound 331 lol.
To me the 800 lb springs just tells me he is certified crazy. How in the world could you possibly need 800 lb with only .650 lift and a low 8,000 rpm and some moderate lobe as they refer to it.. The guy is nuts.
He does not even have heavy big block valves to control.
On top of that he has thousands of dollars in CNC brodix heads. Shaft system. Highest dollar bushed lifters, Expensive Ultra holley carb. Then he takes a used chevy crank no telling how many cycles of use its been through spends money on that piece of crap redoing it and throws it in an old block with some upgrades.
The article or plan starts out cam wise making some sense. Pick a non drag racing less aggressive rate cam with very reasonable amount of lift for a hot street engine. Then he puts 800 lb open springs on it. My opinion that's crazier then using the 235 size head.
I put this article deal up mostly to tease motorhead a bit to see if he thought these heads were big enough for this street bound 331 lol.
To me the 800 lb springs just tells me he is certified crazy. How in the world could you possibly need 800 lb with only .650 lift and a low 8,000 rpm and some moderate lobe as they refer to it.. The guy is nuts.
He does not even have heavy big block valves to control.
On top of that he has thousands of dollars in CNC brodix heads. Shaft system. Highest dollar bushed lifters, Expensive Ultra holley carb. Then he takes a used chevy crank no telling how many cycles of use its been through spends money on that piece of crap redoing it and throws it in an old block with some upgrades.
Last edited by Little Mouse; May 27, 2015 at 08:09 PM.
