mobird

Alright, I think I have my top end build lined out.


I have a 1979 Corvette with a Goodwrench 350 crate engine (8:1 compression), 4-speed, and 3.55:1 gears.


I'm doing a full top end build on the motor later this month. Some people on another forum were helping me put together this build, but I thought I'd post it here for all of you to analyze and make sure it sounds good. Plan for the car is to be a fun street car that I occasionally take to the drag strip.




Heads: NKB Aluminum, 200cc intake runner (I know it's slightly large), 64cc chamber
Intake: Edelbrock Performer RPM Q-Jet (7104)
Cam: Lunati 268 (60103)


Fel Pro 1094 Head Gasket (0.015 shim style for a little extra compression)
Fel Pro 1205 Intake Gasket
Arp Head bolts
Arp Rocker studs
New pushrods and guideplates
Valve cover gaskets
Break in oil and filter
Cloyes double roller timing chain kit


Should give me 9.5:1 static compression. Am I missing anything?


Does this sound solid to you guys? Specifically the cam, will a 268 be too big to give me good low end torque or does that sound about right for my build? Link to the cam for specs: https://www.summitracing.com/parts/lun-60103

CA-Legal-Vette

I don't recognize that brand of cylinder head, but if they offered a 62 cc version, that probably wouldn't hurt you at all.

mobird

It's Skip White's current offering. I know there are some mixed opinions on him on this board, but I did my research and got ahold of some people with firsthand experience with these heads.

MotorHead

The heads are Skip Whites latest Chinese knock off.

c3_dk

You can also go 56cc (67cc/175cc)

https://www.summitracing.com/int/par...make/chevrolet

mobird

That comes close to doubling my cost for heads.


Not really looking for head advice, as I stated above, I did my research and I'm going to use the NKB heads.


I'm mostly asking whether you guys think that cam is the right choice, or if I should go one smaller (262).


And if I'm missing anything in my parts list?


Thanks

cv67

have you bought the heads yet?

mobird

Nope, I plan to in a week or two.

gkull

I used this cam and over 200 cc heads in my L-82 for about 100,000 miles. Because of the 114 LSA I had great MPG and the sound only gave a hint that it was not stock. It was a fun motor. I used Crane high intensity lifters and 1.6 RR's. Your Voodoo with 110 will sound much more lumpy, have less vacuum, lower mpg.

https://www.summitracing.com/parts/c...make/chevrolet

mobird

Not really worried about mpg, and I would like for it to sound more "lumpy". I want it to have plenty of low end without giving up too much on the top end. I don't plan to rev it past 6000 RPM.

jb78L-82

I would think that this lunati voodoo cam 262/268 would be better suited to a lower compression ratio, flat tappet cam area under the curve, 219/227 duration, operating range 1,400-5,700 RPM...strong bottom end with good power to 6,000 RPM....I would think you might want to rethink the Chinese heads though.....

My Howards Roller cam (operating range of 1,500-5,600 RPM) with AFR 180 heads-pulls like a freight train all the way to 6K...

mobird

I gotta ask since everyone is going to give crap, have any of you used these heads from Skip?


With the exception of the early pro comp heads he used, pretty much everyone I talked to or found online who had bought them liked them. All the naysayers were people who had never used them before.


I'd really like to get a set of Profilers, but this is a budget build of a stock 350 bottom end and I can't really afford to pay that much for heads right now. The NKBs give 90% of the performance for a littler over half the price.


It's pretty well accepted that the modern Chinese castings (specifically the Assualt heads which is what the NKB heads are) are good, it's the hardware they come with that is lower quality and has been known to fail from time to time.


The NKB heads are using a good casting (assault) which are then assembled with Erson valves and Comp retainers. I'll be using ARP rocker studs.


I don't see any issue with that, and quite a few people on the Hotrodders forum have used these heads and recommended them to me for my budget build. There doesn't seem to be anything really comparable without spending a few hundred more dollars (which is a lot to someone like me).

Ibanez540r

I have no problem with the brand head for the build, but concerned with the 200cc runners feeling sluggish down low.

Ibanez540r

I'm also only seeing about 8.9 - 9:1 compression assuming an 18cc stock dish and around .025 in the hole.

( a bit different then GKulls build starting with L82 compression and gaining even more with the smaller chambers)

mobird

I get 9.5:1 using the Summit Calculator (https://www.summitracing.com/experta...ion-calculator)

I thought they were -12cc pistons? IF they are -18cc then you're correct, I'll have to double check that.

cv67

He should be able to flat mill down to 58 Id think without a problem?
Cant imagine the decks being any thinner than stock

Ibanez540r

Same calculator (basic) that I used to get 8.93:1

I believe the pistons are the same used in L48's and many of the "8:1" 70's SBC. (actual high 7's:1). I recall an old thread here and hearing other places online that people have physically CC'd them at 18.

Ibanez540r

Here is one of them

https://www.corvetteforum.com/forums...mber-size.html


Apparently it may be a matter of piston dish CC and whether or not the beveled area around the piston is calculated into the advertised dish.

Either way high teens to low 20's CC

cv67

OP ever considered the GM Bowtie Vortecs?
They are iron, would need the intake but their 185 cc version doesnt look bad and its GM
Whats the other 205?

Kacyc3

use this to help you decide
http://www.hotrod.com/articles/ccrp-...head-shootout/