anyone have any feedback on the brodix headhunter 383 24 degree head with methanol? any common problems with them? seem to make some great power

I think it depends how big the engine is. Mine is a 632, and ran better when I switched to gas.

632 with head hunter 383 Mc ran better on gas than both alcohol carb and injection

Mike, that's a loaded question.... what's the application?

I ran these on an alky MFI 565 that worked very good. I also sprayed the motor with a plate kit but I did use gas for enrichment fuel.

quote:

Originally posted by racerdude2054:
632 with head hunter 383 Mc ran better on gas than both alcohol carb and injection

I told you and your dad that would be the case before you did it but you didn't believe me.

quote:

Originally posted by 1320racer:

quote:

Originally posted by racerdude2054:
632 with head hunter 383 Mc ran better on gas than both alcohol carb and injection

I told you and your dad that would be the case before you did it but you didn't believe me.

I will admit that you were correct Ed. The motor made more horsepower on the dyno with alcohol, but we don’t race dynos.

quote:

Originally posted by racerdude2054:
632 with head hunter 383 Mc ran better on gas than both alcohol carb and injection

Those and all other conventional heads are not large enough to support those cubes on alky for and NA combo. Try sucking pees through a small straw...

about ten years ago I ran these heads on a 565, Ron's Terminator, ran very good. John Kyle sent me a carb to try on gas, ran it on a Saturday and swapped back to the injection the next day, the gas carb was about .08 slower than the alky injection. I'd say 565 -582 are close to maxing out an alky combo with conventional heads, after that you will start seeing gas combo's outperforming alky ones unless it's a real low rpm motor combo.

Also, if you pan on using alky in any combo that is meant to produce more that 1.8 to 1.9 HP per CID, the motor should be built with some changes vs gas.

quote:

Originally posted by racerdude2054:

quote:

Originally posted by 1320racer:

quote:

Originally posted by racerdude2054:
632 with head hunter 383 Mc ran better on gas than both alcohol carb and injection

I told you and your dad that would be the case before you did it but you didn't believe me.

I will admit that you were correct Ed. The motor made more horsepower on the dyno with alcohol, but we don’t race dynos.

Exactly. Haven't seen you father post in a long time.

582 with the 383HH with an Alky carb. 4.88 in a 2350 roadster, 4.30 gear and a 107" rollout tire, 9" converter, going through the traps at 7200 in the 1/8th.

582 same basic motor mid 4.60's with a very loose 8" at 2020lbs in a dragster, 4.30 and a Big Bubb tire.

I thing the low deck 598's are about as big as I would go on alky with a carb......unless you have a TBS250 under it.

Don't know much about the head hunters as i've never run them, but they are a 24 degree conventional head with 380 ish runners. If its the standard valve location (non moved center) they seem by design and flow numbers to be really close to a Dart Pro 2 380. Pro 2 380s are 24 degree intake, 380 intake runner, mine have 2.350/1.850. They seem to work good on my injected 598 combo with relatively small cam (748 lift comp shelf cam) 13.5 compression 4.71 best ever. Recently i installed a TBS 250 on top of it with a bigger cam, and it is doing good.

I don't think you'll have a problem on alcohol (carb or injection) but what i saw on the dyno is injection makes more than gas (HP and TQ) and dyno's don't lie, peak torque is lower at 5850 vs 6200, but still better than gas at the gasoline peak RPM. Same story with HP. If the car is slower but dyno says motor is better, you gotta figure out why. In order to take advantage of the added power the methanol delivers, you gotta maximize the combo. To me its all about gearing and converter. The problem I run into is most converter manufacturers and racers out there now a days are all about some very lose converters (flash 6600 to 7000 rpm), if the motor on alcohol makes peak torque 400 RPM lower than on gas then you should consider a converter and gear combination to take advantage of that. I agree we don't race dynos, but we also tend to abandon real honest data when its not as fast as we want it to be. We then revert back to the gasoline carb because its a few hundread faster. My question is did you take the time to change converter, gears, shift points, tire pressures, shock settings etc? I didn't i just let it run what it ran, i'd assume most do some thing similar or hit the easy button and go back to gas.

It takes a good matched combo to make a car run impressive ET's, heck my 565 with 355's injected went 4.68/148 best ever, campaigned at low 4.70 range, but it was a low deck and a combo i worked on for 10+ years. The 598 is a tall deck which is 40 lbs heavier, different cam, made 25 more hp, 60 more tq, but never went 68 anything.... I never really got it to run as hard as the 565. I didn't feel like changing the world to make it run where i thought it should and knew i could never get to the target ET of 4.50's so i just gave up and added a blower.

I don't think dyno's lie, i think we ignore real data they provide when it means more work for us or going against the grain of popular opinion so to say.

just my 2 cents!

these would be on a 548 boosted combo.

Should be awesome. How big is the combustion chamber? From what i recall they are 119-120 but its been a few since I really looked at the specs on those heads.

quote:

Originally posted by jenavet:
these would be on a 548 boosted combo.

They will work great, Steven Hughes has them on his 598 and he made ver 1200 and runs 4.30 at 2050 lbs. pulling timing.

quote:

Originally posted by jenavet:
these would be on a 548 boosted combo.

Mike, I would say if your looking for big power then I'd opt for another head, that head has a smaller ex valve, I'd use a 2.3 or 2.35 intake with at least a 1.88 if not 1.90 exh valve. U can't eat more that you can poop! or you will blow up...LOL

quote:

Originally posted by TOP38:

quote:

Originally posted by jenavet:
these would be on a 548 boosted combo.

Mike, I would say if your looking for big power then I'd opt for another head, that head has a smaller ex valve, I'd use a 2.3 or 2.35 intake with at least a 1.88 if not 1.90 exh valve. U can't eat more that you can poop! or you will blow up...LOL

383 HH is a 2.375 valve and a 1.88 Exhaust I believe.

quote:

Originally posted by The Bozman:

quote:

Originally posted by TOP38:

quote:

Originally posted by jenavet:
these would be on a 548 boosted combo.

Mike, I would say if your looking for big power then I'd opt for another head, that head has a smaller ex valve, I'd use a 2.3 or 2.35 intake with at least a 1.88 if not 1.90 exh valve. U can't eat more that you can poop! or you will blow up...LOL

383 HH is a 2.375 valve and a 1.88 Exhaust I believe.

Nope, 1.85's

quote:

Nope, 1.85's

must be a custom piece because its showing manley titanium 11939L which is a 2.060 exhaust valve

That's got to be a typo, no BBC head has a 2.06 ex valve...

Since your talking forced induction the intake size is less critical. You want a larger EX valve than on a NA combo and use a steeper seat angle like 55 degrees to open up the exhaust throat to get as much flow as possible out the exhaust in order to keep up with the intake forced flow.

quote:

That's got to be a typo, no BBC head has a 2.06 ex valve...

wow i think top38 may be wrong for once!! google a manley 11939L its a titanium exhaust valve for bbc.i think this dicussion maybe over your head al...1.85 is a D1 valve and 2.06 is a D3 valve

quote:

Originally posted by jenavet:

quote:

That's got to be a typo, no BBC head has a 2.06 ex valve...

wow i think top38 may be wrong for once!! google a manley 11939L its a titanium exhaust valve for bbc.i think this dicussion maybe over your head al...we talking real hp not that division 1 limp et

HA HA,,,, I am talking BBC conventional heads, Not Niagra Mikey TD I go Wicked Fast Heads!