A bunch of questions ..

[chambr]

Had a few questions and looking for some advice for my 79 Z28 auto ... motor is definitely not stock looking

Questions:

Engine Code 14010207 (#s on pass side - 1259)
Head casting - 333882

1. - What can you tell me about the motor?
Original equip?
What is the stock comp ratio?

2. - 2 bolt/4 bolt? (without taking the oil pan off)

3. - Heads - What size valves? good heads for the build below?

Motor has Edlebrock 1406 - 600 CFM carb
Headman headers - true dual
Victor Jr intake
Bad cam (bad lobes - runs like crap)

Looking to change a few things as follows:

Comp Magnum 270H Hydraulic Flat Tappet Camshaft
Lift: .470''
Duration: 270°
RPM Range: 1800-5800

4. - Can i use the stock springs with this cam or need to change them out?

Swap out the victor jr (3500-8500RMPM range) with a Performer dual plane intake (1500 - 6000 Range)

Swapping out the stock BS gears in the rear (think they are like 2.56's ... with 3.73's -- will the new gears fit the pumpkin?

Any other suggestions?

 

[Pfrederiksen]

I think going from 2.xx gears to 3.xx and up are a different carrier.
Could be mistaken though.
If its a dog, I'd suspect 3.08's they were pretty common.
If so, you're good to go.

P

 

[Air_Adam]

Stock gears for a Z28 should be 3.42 (auto) or 3.73 (4-spd) should they not?

 

[CorkyE]

Block is early to mid 80's & most were 2 bolt unless from a truck, then could be 4 bolt. Heads are low compression with small 1.94/1.5 valves. Here's a pretty good site to look at:

http://chevytech.com/

And like Air Adam said - stock gears will be 3.42 on a 79Z with auto trans.

BTW - that Victor Jr intake is a way big mismatch for those heads & carb. Probably really killing a bunch of low end torque.

 

[hhott71]

Everyone sells the .470" lift cam that has the same lobe. Might as well buy it from Elgin, Sealed Power, or other generic parts makers ,, it'll be on a better core than Comp uses. Use the generic Z28 springs, available everywhere for about $25.

 

[ZS10]

Use the generic Z28 springs, available everywhere for about $25.

And then the heads will be worth $25.

 

[chambr]

Thanks

Thanks for the feedback ..

BTW - that Victor Jr intake is a way big mismatch for those heads & carb. Probably really killing a bunch of low end torque.

Is an understatement ... plus with the bad cam suprised the car can even run at all ..

Just bought the car - knew there were issues but have plans to get it right .. if I can get 300 HP from it I'll be happy enough ...

Replacing the front suspension in the next 2 weeks .. then the engine ... performer intake, 270 or 280 cam .. already has headman headers and Edelbrock carb (600 cfm).

Next - change the gears to 3.73s .. and new leaf springs.

No rush ... it was bought as a project car anyhow ...