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Advice on engine build

  
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Advice on engine build

 
card16969 card16969
New User | Posts: 5 | Joined: 05/13
Posted: 05/13/13
07:53 PM

Im buying a 78 camaro from my father and he has a GM 350 crate motor that was never installed that he bought for a truck that he sold before the crate motor was delivered sitting in his garage that hes throwing in with it and I have a couple questions. I tore the motor down to inspect everything since its been sitting for 10+ years and its perfect never been installed. It has 4 bolt mains, stock rods and stock pistons. I have the following parts for it... hooker long tube headers, mallory hyfire iv ignition box, hei dist, holley contender intake, edelbrok performer 1400 carb, mild rv cam.
I am buying a set of promaxx performance 64cc heads, comp cams high energy 1.6 roller rockers and running arp head studs. My question is should the stock rods and pistons hold up to a weekend cruiser that might at most see the drag strip a handful of times in its life and spend most of the time going out on dates and to car shows? Im trying to save money and not have to replace the rods and pistons if possible, the motor has low performance heads on it  so thats why i am upgrading them.
Also im new to building motors and keep seeing people saying total timing, i know about timing advanced or retarted on the dist. but need some help in this area on what should be done to make a fun motor that isnt going to blow up from detonation so any advice and explanations would be greatly appreciated.  

Dave632 Dave632
Addict | Posts: 2217 | Joined: 07/08
Posted: 05/13/13
08:10 PM

You should be fine with the stock rods and pistons.
Just keep the rpms low. By that I mean limit to around 6000.
This should be enough for an occasional trip down the strip and plenty of
cruising.
Total timing is the static timing and the centrifugal timing added together.
Most SBs run about 34-36 degrees total.
Edelbrock 1400, what cfm is that?  
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68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 05/13/13
08:58 PM

Eddy 1400 = 600cfm w/elec.choke.  
68scott385 68scott385 68scott385

card16969 card16969
New User | Posts: 5 | Joined: 05/13
Posted: 05/13/13
11:18 PM

Its a 600cfm carb

Ok i know this sounds dumb but what is static and centrifugal timing. Im used to motorcycles where you set the crank then use adjustable gears to vary timing on the cams. How do you adjust both?  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 05/13/13
11:58 PM

You can set the timing by the crank on a small block also. You can advance or retard it by either a crank gear with advance and retard marks. Or the old school way is to degree the cam and lock it in at the cam gear.
  Your base setting should be 12* with the vacumm advance plugged. Then set your total timing @32* and have it all in at 2200-2500RPM for a street engine. Small blocks really respond to timing (they love it).
  Another way You can advance the timing until it pings then back it off. That will also depend on the octane fuel your using. The higher the octane number the better it is for detonation. "Tuff" has a thread about Fuels. What Ron and Rom means. Its a good read.

Bob  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 05/14/13
04:24 AM

this video may be helpful for understanding ignition timing.

    http://www.youtube.com/watch?v=UYGU7mTwsZc  

p2-72chevelle383 p2-72chevelle383
Guru | Posts: 1757 | Joined: 08/09
Posted: 05/14/13
01:47 PM

Not sure what promaxx heads are but I'm sure they are chinese garbage probably restamped procomps. I'd look at better heads.  
p2-72chevelle383

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 05/14/13
02:30 PM

Icon Quotep2-72chevelle383:
Not sure what promaxx heads are but I'm sure they are chinese garbage probably restamped procomps. I'd look at better heads.

Their website says formally known as Alabama Cylinder Head but doesn't have any information whatsoever. I'll include a link for those that want to waste a minute or two.


http://www.promaxxperformance.com/  
68scott385 68scott385 68scott385

p2-72chevelle383 p2-72chevelle383
Guru | Posts: 1757 | Joined: 08/09
Posted: 05/14/13
05:02 PM

Ya I just read that they are the new name that patriot is going by. Better than procomp still chinese  
p2-72chevelle383

skyeking skyeking
Addict | Posts: 2738 | Joined: 08/09
Posted: 05/15/13
10:52 PM

Hi there,
 They are flogging small trucks out here called 'Great Wall".
 Maybe that's where they should be pushed over.
 2nd option would be the Marianas Shelf in the Great Pacific.
 It's only 7 miles deep.   See you later...Skyeking...  
skyeking

card16969 card16969
New User | Posts: 5 | Joined: 05/13
Posted: 05/17/13
09:58 PM

Ok sorry its taken me so long to respond the last couple days have been crazy and after having to pay for a small medical procedure out of pocket im now changing the direction of the build and am going to keep the stock iron heads and deck them to bump up the compression a little and port and polish them. The block number is 10066036 which when you run it turns out this is a Goodwrench or "targetmaster" crate engine so it is a truly new motor sadly it was made in mexico and not the us lol. The heads are casting number 10066036 which are 76cc heads. After reading the mouse motor build they are 76cc heads with 1.94 1.50 valves which they say if you deck them it takes them down to 73cc and bumps up the compression a little to a whopping 8.4 to 1 and a port job and bowl blend does wonders for them. The Holley intake 300-38 i have turns out after doing research is the same as the stock intake so now im shopping for an intake. The cam that i have thats been sitting on a shelf for a couple years is magically  damaged so now im also shopping for a cam and looking at the comp cams 268h.

So my questions now are should I keep the stock valves in the head and change to 1.6 rockers to save the money or should i upgrade to 2.02/1.60 valves when i deck the heads and port and polish them?

Also what intake do you like? Ive always ran just edelbrock performers but i know some of the other intakes have different advantages and i do want to make the most out of this since im stuck buying the parts.

What are your opinions on the comp cams 268h or should i run a different cam. Im not worried about fuel economy as this is just a recreational car/toy

I have 2 different carbs in front of me that i can use. A Edelbrock 1400 600cfm electric choke and a Holley 3310-4 750 cfm any opinions?  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 05/17/13
10:38 PM

By the time you spend all the money to shave the heads, have bigger valves put in, then port & polish them (even if you do the p&p work you'll have expendables to buy), you could have spent another $100+/- and have aftermarket heads with 64cc chambers AND breahte better than the worked heads.  
68scott385 68scott385 68scott385

card16969 card16969
New User | Posts: 5 | Joined: 05/13
Posted: 05/17/13
10:42 PM

Decking the heads and the different valves is going to cost me aprox. $350 through my best friend that works at a machine shop just waiting on his uncle who owns the shops approval. The port and polish im going to do myself.  

redneckjoe69 redneckjoe69
Addict | Posts: 2337 | Joined: 03/10
Posted: 05/18/13
08:09 AM

im partial to holley's, so id go with the 3310.

  268 is a decent all-around cam.   im personally running the 268 comp in my camaro, and it just never stops pulling on the street.   its better to under cam, then over cam.  

  the edelbrock air-gap series seem to be the hot ticket today for intakes.

  heads get surfaced, not decked.  blocks get decked, for future reference.     the heads and compression ratio seem like the weak part of the build.   i wouldnt waste any time or money on those heads.   id check with some of your local machine shops for some 64cc heads with screw-in studs.   sometimes you can find a deal.   people drop stuff off sometimes and never come back to pay the bill.   you might end up with a decent set of heads for the cost of parts & labor?  

card16969 card16969
New User | Posts: 5 | Joined: 05/13
Posted: 05/18/13
02:06 PM

Im debating on parting out a different project car thats in storage and just biting the bullet and buying some aluminum heads, after reading what comp has to say my springs seem insufficient so theres another 200 so im over half the price of the heads. Sorry for the incorrect terminology i appreciate the correction. From what i read on the air-gap series with an air filter theres not enough clearance under the stock hood for it.  

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