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Old 07-28-2013, 01:35 PM
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Please help me pick out Engine parts for 427 BBC

I am rebuilding a BBC 427, Dec. 1968 block for my 69 Camaro. I attached a Flow chart from a Machine shop that ported the new /never used 14011077 GM, open chamber, 118 cc, round exhaust port, Rectangular large port cylinder heads, 2.190 intake valve and 1.94 0r 1.88 not sure on the exhaust exhaust valves, Winters aluminum heads using the Winters aluminum intake. It is standard bore now , but will be bored .30 over.

I am using the stock 4346 800 cfm Holley, this is a dual feed vacuum secondary carb.

My goals are stock era chrome valve covers, use roller rockers that fit into these. I am leaning toward Comp Cam components for now. Roller cam and lifters. Most likely will get a K-kit through Comp Cams. I want to run pump gas 91 oct to 93 octane. I want to have enough vacuum to run RS headlamps and power brakes. I have been told to use a piston with 36cc to 38cc dome, not sure if this is correct. I have been told that the Aluminum heads lower the compression ratio by approximately 1. I am looking to have 10:1 to 10.5:1 compression. I am using a stock cross drilled tufftrided crank. 2.200 inch journals for rods and 2.749 inches for the main journals.

I want a good piston and rods. I am only able to find the "Ross" piston that has 36 cc dome at this point.

It will be street driven and the occasional spirited driving. Shooting for 500hp.

I have the motor at the machine shop now getting bored. This motor has NOT been decked. Going into a manual shift transmission car.

Please help with Piston brand, rods, and cam grind suggestions. I want quality parts, not low budget stuff.

Thanks for your help. If you need more numbers or information please ask I am not schooled up on engine stuff yet!


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Old 07-28-2013, 02:45 PM
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I could not get the test sheet to scan so I typed it in. Stock specs not entered.

Intake valva Dia. 2.25 Stem dia.: 0.372 Area: 3.867
Exhaust valve dia. 1.88

Intake test2 Pocket Port , Port Match
LIFT .100 .200 .300 .400 .500 .600 .700 .800

Stock CFM 266

Range 151 300 300 448 448 448 448 448

Percent 51.2 52.8 72.2 88.4 69 74.4 77.4 76

CFM of flow 77 158 217 265 309 333 347 340 294 CFM

%increase 13 17 10 9 12 10 11 10 11%

Exhaust test 2 Full Port Valve Dia.: 1.88 Stem Dia.: .341 Area: 2.685 Stock CFM 174

.100 .200 .300 .400 .500 .600 .700 .800

Range 78 158 320 320 320 320 320 320

Percent 75.6 72.4 51.7 61 70 77.4 80.8 83

CFM of Flow 59 114 165 195 224 248 259 266 218 CFM

% Of Intake 76 72 76 74 72 74 75 78 74%

% Increase 20 16 31 17 23 27 28 31 25%

Test Pressure : 28" H2O

Hope this helps

Last edited by JodyRS/SS; 07-28-2013 at 02:55 PM.
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Old 07-28-2013, 04:07 PM
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If you have the motor in the machine shop being bored and the machinist doesn't have the pistons on hand time to find another machine shop!!...
You can never have too much power, just not enough traction...

Semper Fi

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Old 07-28-2013, 05:16 PM
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what 68 NoveSS said times 2.dont let him machine your anything!
TRW,Mahle and many others make pistons for your application.Those heads flow enough to make 500 plus HP easy.
My cam is 256 duration and my headlights still go up and brakes work so you should be ok with a mild 500 HP engine.
The type of HP delivery might be something to discuss? and what RPM range works for your car and best suits your needs?
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Old 07-28-2013, 09:46 PM
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Sorry I miss spoke. The engine is at the machine shop disassembled ready to be bored. I called Summit today, the sales rep suggested an SRP piston. Part # SRP 212133-8.
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