|05-21-2014 01:17 PM|
|05-21-2014 06:15 AM|
|1Gary||I keep insisting the bare castings of AFR or Brodix aren't that much money when considering what your paying and what you get................|
|05-20-2014 07:37 PM|
|ericnova72||I found a couple references to the NZAD heads as "not being the cheap ProComp castings, with their porous and mixed alloy castings" and that they were made from A356 alloy, but that's all I could find...no listing of who actually made them. Maybe they are similar to the Assault casting that has shown up here in the USA|
|05-20-2014 06:24 PM|
|NZJacksonNZ||I was wondering about that, the fact that their straight from the factory means they could have been cast anywhere. But iv'e never heard anything bad about them, NZAD is a company with good reputation. Maybe just ******* the springs and valves and go aftermarket. 'She'll be right|
|05-20-2014 07:19 AM|
NZAD is New Zealand Automotive Distributors. They make a big deal of telling you they get the castings factory direct; without telling you where the factory is. They're obviously chinese castings; which in and of itself is not bad. However, is it an Assault core; or a lesser quality casting? No one knows. Considering the "high performance" generic springs, and obfuscating marketing, I suspect they're a lesser quality casting.
Just my opinion.
|05-19-2014 11:15 PM|
its not just the size of the holes in the head that determines air flow. You need to know how many CFM of air can come in the intake side and how much can exit.We need both numbers.I know nothing at all about NZAD castings?
When building a custom engine sometimes buying the castings bare is the best bet. Then when you buy a camshaft you get the matching cam kit.Myself,I go as far as buying extreme duty SS manley valves for a giant roller cam as I dont want the valve head to come unglued from extreme valve spring pressures and/or high rpm,,,,
and here we go again
|05-19-2014 09:14 PM|
|NZJacksonNZ||Right, I didnt think 15-20cc would matter too much. 200cc was the biggest I could find here (in aluminum). The brand is NZAD, cost $1200. They simply said the springs were "High Performance". Can always replace them with better if need be, springs arnt expensive.|
|05-19-2014 05:00 PM|
You didn't say anything at the beginning of this thread about having heads, and were asking about what size to buy...and were advised by a couple of folks here that 200cc would be too small, and to look at 215-220cc or bigger....so you went and got 200cc anyway??
What company made these heads??...Yeah, it makes a difference.
Saying the springs are "uprated" and "good for .575" lift" tells nothing about the spring really. Need to know seated and open pressures, coil bind height, and spring rate.
|05-19-2014 02:14 PM|
|vinniekq2||those are tiny heads for a super charged rocket. Try you tube? also try making an album,,,|
|05-19-2014 02:09 PM|
Head specs are:
Combustion Chamber Volume 64cc
Exhaust Runner Volume 70cc
Intake Runner Volume 200cc
Spark Plug Style Straight
Intake Valve Diameter (in) 2.020 in.
Exhaust Valve Diameter (in) 1.600 in.
Maximum Valve Lift (in) 0.575 in.
Number of Springs Per Valve: Dual
So far ive spent about 3.5 grand, not too bad really. Would love to post a pic of the car but not sure how, I tried posting a link to facebook but didnt work.
|05-19-2014 08:59 AM|
|vinniekq2||who's 200 cc heads are we talking? Thats a lot of power to be leaving on the table,,,,|
|05-19-2014 02:12 AM|
Well so far ive got the 350 block 4 bolt mains (1970 something), Scat 383 crank, Speed master H beam rods, Probe forged pistons 30 thou oversize and -22cc dished, pro street harmonic balancer, new gasket kit and 200cc aluminum heads with stainless valves and uprated springs. Timing gear and bearings are new too
Still need lots of parts, but hard building this engine while trying to build the car and working haha. Cam and roller rockers next? The heads and everything above can go on once the block and gearbox have been fitted to the car.
|05-18-2014 09:31 AM|
if you only want 6-700 hp,you dont "need" a solid cam.If you plan to step it up a lot,then that is different.
maybe post the other parts you are using so we can look at the list?
|05-18-2014 03:18 AM|
|NZJacksonNZ||Cheers for all this guys, really useful info. Think i'll go with a solid blower cam then|
|05-16-2014 12:01 PM|
|AutoGear||Roller rockers and lock-nuts with stiff pushrods...Not to mention it seems like todays modern solid flat-tappet camshafts run a lot less lash than the old cams did. Twice a year seems right.|
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