"camel hump heads" vs. AFR race ready

[the_husk]

Hi, how much more power would the AFR's give over the camel humps that are stock, not ported?

Thanks

[19doug90]

youre not serious are you??

umm a lot, but your cam and intake have to match as well. The motors only as good as the sum of its parts. It sounds like you have a lot of research to be doing.

[the_husk]

I have the cam and intake, just wondering what the difference would be.

[Randy_W]

On an average 350, about 40 h.p.

[the_husk]

Well, it is going to be on a 383, and we are going to build up a second engine. It is probably going to be FI with a vortec supercharger.

[19doug90]

Well, it is going to be on a 383, and we are going to build up a second engine. It is probably going to be FI with a vortec supercharger.

your questions are seriously uninformed

and to say youll get a "40hp" boost doesnt mean anything.

Firstly your cam and heads have to match, if you have a cam that has crazy lift and heads that wont flow any of it your motor will run like crap.

just like if you have heads that flow a ton and a very mild cam, well that will at least run better, but is seriously reducing the performance and probably gas mileage as well of the motor.

Not to mention the same cam in a 383 will make peak power 400-500 rpms lower then in a 350.

What is it that you want to do with this motor? what wheel hp are you shooting for?

an engine is not merely the sum of its parts. All the parts have to match and work well together.

[the_husk]

I know that, I was just wanting to see the performance differences between the two heads. This is going to be a drag motor and hoping to make at least 600-650rwhp with at least 575-600rwtq.

[19doug90]

I know that, I was just wanting to see the performance differences between the two heads. This is going to be a drag motor and hoping to make at least 600-650rwhp with at least 575-600rwtq.


http://racingfeed.com/downloads/chevy_flow_data.pdf

i think this link should be stickied on almost every board, ive found all the information ive looked for to be fairly accurate.

Cfm = hp compare everything for yourself

altho the afr's even with a crazy cam i dont think will make over 500 wheel hp, gonna need a bottle and a solid bottom end to make that.

[hud697]

I know that, I was just wanting to see the performance differences between the two heads. This is going to be a drag motor and hoping to make at least 600-650rwhp with at least 575-600rwtq.
never happen with the double humps

[Randy_W]

[QUOTE=19doug90]your questions are seriously uninformed

and to say youll get a "40hp" boost doesnt mean anything.
QUOTE]
It does if you read the whole damn post Mr Know It All!
I said on avg 350, that would be something like a 268-280 flat tappet cam, a 180 dual plane and a 650 carb with headers. On a combo like that, which is very avg, good modern heads are worth about 40 h.p. over the old 300 heads. That's not something I dreamed up, that comes from building engines since 1968.

[GreaseDog]

judging by the the posts in this thread, i dont think that this guy realizes that his 500rwhp goal is going to require a full truck build, not just an engine. the trans, rear end, driveshaft, and rear suspension will all need to be addressed in order to hold this kind of power. that BIG $

[the_husk]

judging by the the posts in this thread, i dont think that this guy realizes that his 500rwhp goal is going to require a full truck build, not just an engine. the trans, rear end, driveshaft, and rear suspension will all need to be addressed in order to hold this kind of power. that BIG $

We already have the built truck. We got it to low 11's with the double humps/camel humps. We are just trying to break the 10 second barrier, mid to low 10's if possible.

[Hrtbeat1]

I have seen flow data on the old Camel hump heads. They are almost exactally the same as the stock LT-1 aluminum #374 heads. This was on stock heads, done as a comparison.

:patriot:

[manimal]

If youre building a mall cruiser, then use the old fuelie heads. The intake runners are too small in stock form to handle the air flow that will be required from the blower. Another thing is the cost of "building" them,seats,guides,valves,surface,cc'ing them,porting/polishing,etc...
AFR's are supperior all around. You are trying to compare apples to oranges. You'l want to fill the cylinders as effeciently as possible, camel humps wont do it. You need to check out www.67-72chevytrucks.com and look in the DYNO section of the engine forum. There is a few guys over there that will convince you. Good Luck and choose wisely.
-Lance

[19doug90]

[QUOTE=19doug90]your questions are seriously uninformed

and to say youll get a "40hp" boost doesnt mean anything.
QUOTE]
It does if you read the whole damn post Mr Know It All!
I said on avg 350, that would be something like a 268-280 flat tappet cam, a 180 dual plane and a 650 carb with headers. On a combo like that, which is very avg, good modern heads are worth about 40 h.p. over the old 300 heads. That's not something I dreamed up, that comes from building engines since 1968.


more meant that 40 peak hp doesnt mean much cause you have to have the right matching parts to have the midrange to go with it.

more so it sounded like just extremely vague general questions. i definitly could have put it nicer but there are a loot of posts that go up that are way too vague and general.

also if he was running the lower end of what you said cam wise, then that cam wouldnt be well matched to a set of afr's

now that theres more info, it appears thats not the case.

[Justin_Inc]

I know that, I was just wanting to see the performance differences between the two heads. This is going to be a drag motor and hoping to make at least 600-650rwhp with at least 575-600rwtq.

Dart Iron Eagle 210cc heads
running somewhere in the 10-11:1 compression
Vic Jr Intake,
good set of 1 7/8" headers
850 cfm carb tuned
supporting camshaft (XE294H-10 should put you close to what you want, its a 5/7 swap cam. I've been pretty happy with them in the past)

I would recommend swapping over to a hyd roller cam, again i stick with the 5/7swap cams, they have proven good to me.

[karter25]

600hp? Are you serious? Thats way more HP than any stock chevy head would give you. Thats more HP than most aftermarket heads would give you even with a supercharger, unless you spend about 30k on it. The old 461 and 462 chevy heads are good heads, but they are so old, the valves have been replaced so many times and the seats replaced, they are about worn out after 30 years of service. I believe the newer vortec heads dyno about as well, if not better than the old 461 or 292 chevy heads.

[GreaseDog]

what does the truck consist of now in the 11 second version?

[blown68ssrs]

Husk, In the early 70's, Grumpy Jenkins has a small block Vega that dominated the Pro-stock class. It was a 30 over 327 and ran well into the low 9's. It had nothing more than GM castings and Holley Blue pumps.

[manimal]

Husk, In the early 70's, Grumpy Jenkins has a small block Vega that dominated the Pro-stock class. It was a 30 over 327 and ran well into the low 9's. It had nothing more than GM castings and Holley Blue pumps.

I agree,to a point. He also ran VERY high compression and NOT a truck. There was MANY hours of flow bench work on those heads. Too also include dual 4bbls massive solid roller and full roller valve train.

-Lance

[the_husk]

what does the truck consist of now in the 11 second version?

383 stroker all forged
The double hump heads
750cfm holley double pumper
10.5:1 CR
Hedman 1 3/4" stepped headers into 3.5" piping to flowmaster 40 series with 3" turndowns underneath the cab(drones terribly)
Msd 6al ignition
Edelbrock performer rpm high rise dual plane intake maniold
Th-350 tranny with 3800 stall
Crower "beast" cam with the following specs:
2800-6500 RPM Range
304/316 Adv. Duration
488/509 Gross Lift
I am probably forgetting something, as I do not have the receipts in front of me right now.

[GreaseDog]

gears and tire size?

[the_husk]

4.10 gears and I believe tires are 285/xx/xx I'd have to go out and look.

[the_husk]

I agree,to a point. He also ran VERY high compression and NOT a truck. There was MANY hours of flow bench work on those heads. Too also include dual 4bbls massive solid roller and full roller valve train.

-Lance

Also, the raceweight of the truck is 3200 pounds with a 200 pound driver.

[blown68ssrs]

I agree,to a point. He also ran VERY high compression and NOT a truck. There was MANY hours of flow bench work on those heads. Too also include dual 4bbls massive solid roller and full roller valve train.

-Lance
Sure. The point is, work with what you have.

[hud697]

Husk, In the early 70's, Grumpy Jenkins has a small block Vega that dominated the Pro-stock class. It was a 30 over 327 and ran well into the low 9's. It had nothing more than GM castings and Holley Blue pumps.
apples to oranges, i bet that vega was in the 2500lb or less range

[karter25]

Husk, In the early 70's, Grumpy Jenkins has a small block Vega that dominated the Pro-stock class. It was a 30 over 327 and ran well into the low 9's. It had nothing more than GM castings and Holley Blue pumps.


Dont believe this fella is getting Grump to build his motor. 461/462 and Bowtie heads all were great in their day. Their day has come an gone. I think even Super Stock racers are using aftermarket heads these days. I might be wrong about that, but the old heads just cant compete with todays technology. You want to run 10's with a truck, like grease said, you have some work and money spent ahead of you. In my opinion, just about any aftermarket head would do you better than those heads you mentioned.

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