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1987 & Later Chevy 305 Spec parts


comeback kid

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I just purchased a 1987 roller Cam 305 TPI engine.

I had asked Mr. King about part numbers for to make it a carbed Spec CMC engine. I did not right them down at the time (2 months ago).

The Edelbrock intake Manifold and Performer Cam numbers are what I need to verify.

Thank you in advance.

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I'm always available if you have any questions, but as RP says, PLEASE make sure you are reading the rules if you are building a car!

 

So are we going to see you out at any races this year?

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I am trying.

I was able to get the 1987 305 roller cammed engine, so I wanted to make sure I get the right cam and intake manifold for that engine to convert it from TPI to carb.

The Edelbrock Cam #2209 is listed for the 1987-1995 305s.

The #2104 manifold is what I thought was legal.

The are different part numbers from Edelbrock for the application.

The 1979 305 I have is in the machine shop getting cleaned and prepped. I just need to buy the cam, I already have the other parts needed. I have an old Performer EGR Manifold that I will be using, part number 3701. I have installed a EGR Block-Off Plate.

I am picking up a Holley Carb (# 4776C) from an old Midwestern Council mate.

The brakes are about done, the wiring is done.

I'll probably be just in HPDE for this year as I am going that route to earn my Comp Licsence.

I am not able to afford an approved head and Neck restraint until next season.

I want to get the car finished properly and go have some fun.

I just started to work on a new fiberglass front air dam for the third gens (83 Camaro Z-28 specifically).

It would be different if I had around $ 2,000 of sponsorship funding, but we all know how that goes for us road racers.

So, yes the car should be done for HPDE by early May.

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Todd,

 

It's good to see you over here. I've seen you over at FRRAX. I'm in the same boat you're in. I'm building a car and going through the DE's now. I recently built a carb spec engine. As far as the intakes go, the 2101 will fit any '86 and older heads. Those are the style with the center four bolts at the same angle as the outer 8. The 2104 is for '87 and later heads that have a more shallow angle on the center four bolts. The cam should work for anything '86 and older as well. IIRC, the '87-up engines used roller lifters instead of the flat tappets that the 2102 uses.

 

I'm no engine expert, but if you have any questions, let me know. I'll try my best to help out.

 

 

Adam

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I am also building the spec 305 motor. I have a spare LG4 short block I just need a set of heads to go with. Yes I am actually racing the car with the lowly L03 under the hood. Talk about underpowered. yikes.

 

Anyone have a used 4776 and intake for sale?

 

kyle

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The rules;

 

8.15. GM Spec Engine Option

All of the following unmodified aftermarket components (and only these components) may be installed on an OEM stock unmodified GM/Chevrolet 5.0 liter (305ci) V8 long block to create a carbed, spec CMC GM engine:

1. Holley carburetor 600cfm-4bbl #4776

2. Edelbrock Performer intake manifold #2101 or #2104

3. Edelbrock Performer Cam kit #2102

4. GM OEM H.E.I. distributor (non-computer controlled)

 

The way I understand it is that you can use these parts for your carbed motor and only these. So I don't know about the 3701 intake because it is the same with egr, but the 2209 cam is definately not right.

 

#2102

 

ENGINE: CHEVY 265-350 V8

RPM RANGE: 1500-5500

 

Duration at 0.006" Lift: Intake: 278° Exhaust: 288°

Duration at 0.050" Lift: Intake: 204° Exhaust: 214°

Lift at Cam: Intake: 0.280" Exhaust: 0.295"

Lift at Valve: Intake: 0.420" Exhaust: 0.442"

Timing at 0.050" lift: Open Close

Intake: 5° ATDC 29° ABDC

Exhaust: 44° BBDC 10° BTDC

Centerlines: Lobe Separation - 112° Intake Centerline - 107°

 

 

 

#2209

 

ENGINE: CHEVY 265-350 V8 (1987-Later)

RPM RANGE: 1500-5500

 

Duration at 0.006" Lift: Intake: 280° Exhaust: 290°

Duration at 0.050" Lift: Intake: 212° Exhaust: 222°

Lift at Cam: Intake: 0.308" Exhaust: 0.319"

Lift at Valve: Intake: 0.462" Exhaust: 0.479"

Timing at 0.050" lift: Open Close

Intake: 1° BTDC 33° ABDC

Exhaust: 48° BBDC 6° BTDC

Centerlines: Lobe Separation - 112° Intake Centerline - 107°

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The specs for cam #2209 is why I brought up the question.

Remember the 87 305 is a roller engine from the factory.

The Edelbrock Performer Series cam for this application is the # 2209.

The lift on the 2209 is signifigantly larger than the 2102, and the duration is a little longer compared to the 2102.

The 1987 TPI engine also has more compression stock compared to the non-roller/non-TPI engines. 9.3:1 compared to 8.0:1 to 8.5:1 with most of the older engines.

Since there are also internal differences between the older 305's and the newer ones, I'll just build the 87 for NASA AI/ MWC AGS competition, finish the builds on the two 79 engines and sell one of those two 79 engines to recoup what I spent for the 87 initially.

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Just a word about 305 early block that the dipstick is on the driver side and the later blocks it is on the passenger side. This becomes an issue for the GM exhaust manifolds for the camaro from 82-92 because the outlet hits the dipstick when using an early block and newer manifolds.

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The specs for cam #2209 is why I brought up the question.

Remember the 87 305 is a roller engine from the factory.

 

Todd this isn't pick and choose the rules you want to follow here. Just because it is a roller motor doesn't mean you have to use a roller cam. Your going to have to de roller cam that motor then. The correct cam is the 2102. That is what I did to the motor I just built and I have put non roller cams in roller motors in several of my engines since I started in 02.

 

Hope this helps.

 

Bryan

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