Double hump head performance
Thread Starter
Burning Brakes
Joined: Mar 2001
Posts: 1,171
Likes: 0
From: Thornton Co
Double hump head performance
I am running a set of SHP double hump heads, 64cc, 2.02/1.60 valves. I have started looking at the Dart Pro aluminum heads, 64cc, 2.05/1.60 valves.
I guess my questions are:
1. How good are the double hump heads?
2. Will I see any noticable performance improvements with the Dart heads?
3. How much weight will I save going with Al vs. iron.
4. Are the double hump heads worth anything if I want to sell them?
I know so many questions. :confused:
Thanks :thumbs:
I guess my questions are:
1. How good are the double hump heads?
2. Will I see any noticable performance improvements with the Dart heads?
3. How much weight will I save going with Al vs. iron.
4. Are the double hump heads worth anything if I want to sell them?
I know so many questions. :confused:
Thanks :thumbs:
Burning Brakes
Joined: Aug 2001
Posts: 1,104
Likes: 1
From: Frederick Md
Re: Double hump head performance (Brutal64)
I depends on what is under the heads, on top in the way of manifold and carb. The heads bone stock out flow the stock heads by a wide gap. The intake and exhaust runners are a lot bigger. The valve pockets are much better and last the vales are bigger, not always a plus.
I'm guessing they are about 40 pounds lighter for the pair.
Original heads don't do it for me but I'm sure there is a market if they are in good condition and not hacked to death.
I'm guessing they are about 40 pounds lighter for the pair.
Original heads don't do it for me but I'm sure there is a market if they are in good condition and not hacked to death.
Thread Starter
Burning Brakes
Joined: Mar 2001
Posts: 1,171
Likes: 0
From: Thornton Co
Re: Double hump head performance (muncieman)
Well here's what I've got. I can't help but think the new heads will help.
355 CID
TRW 10:1 Flat tops
Summit Stage II rods
Gear driven Crane Cam 222/234 dur 469/492 lift
Crane 1.52 roller rockers
Mallory Comp 9000 dist
Edelbrock Victor Jr.
Speed Demon 650 MS
Dynomax headers
Flowmaster 40's 2.5" exhaust, H-pipe
4sp/3.55
355 CID
TRW 10:1 Flat tops
Summit Stage II rods
Gear driven Crane Cam 222/234 dur 469/492 lift
Crane 1.52 roller rockers
Mallory Comp 9000 dist
Edelbrock Victor Jr.
Speed Demon 650 MS
Dynomax headers
Flowmaster 40's 2.5" exhaust, H-pipe
4sp/3.55
Burning Brakes
Joined: Aug 2001
Posts: 1,104
Likes: 1
From: Frederick Md
Re: Double hump head performance (Brutal64)
No doubt! You can run a little higher compression with aluminum heads, say a 1/2 point. Adjust the combustion chamber size a little and you're there.
Do your self a big favor, check spark plug type and fit. I have a set of fast burn heads and a $750 set of custome built headers to clear all the goodies.
[Modified by muncieman, 12:13 PM 11/6/2003]
Do your self a big favor, check spark plug type and fit. I have a set of fast burn heads and a $750 set of custome built headers to clear all the goodies.
[Modified by muncieman, 12:13 PM 11/6/2003]
Le Mans Master
Joined: Oct 2000
Posts: 8,897
Likes: 1,357
From: Santa Ana CA
Re: Double hump head performance (Brutal64)
You could save some money by having the heads pocket ported and port matched. (This however won't remove much weight.) Flow Technology in Garden Grove, CA does excellent work. See my post in the C3 section under Dyno Day Revisited for my mods and hp ratings.
With a far milder setup on my '64 331 CI did 293 hp at the wheels on the dyno.
With a far milder setup on my '64 331 CI did 293 hp at the wheels on the dyno.
