LO3 Head Options - Third Generation F-Body Message Boards

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LO3 Head Options

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Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

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Old

06-12-2009, 06:40 PM

#1

Junior Member

Join Date: Apr 2009

Location: Wichita, KS

Posts: 29

Car: '91 Camaro RS

Engine: 305

Transmission: 700R4

Axle/Gears: 2.73

Classifieds Rating: (0)

LO3 Head Options

I'm thinking of throwing a set of Vortec heads on my '91 RS. I'm not too familiar with 305s. I do understand that for the most part, a small block Chevy is a small block Chevy and most parts will interchange.

My question(s):

1) A stock 305 swirl port head has a 58cc combustion chamber, correct?

2) What would happen if I put 64cc Vortec heads on my LO3? I would assume lower compression.

3) Are there a set of 58cc Vortec heads? Anyone know where to find them?

4)Will all factory accessory brackets bolt on?

5) Does bore size play a role in selection of small block heads? i.e.- 305 bore vs. 350 bore.

__________________
'91 Camaro RS, 305, Automatic, needs a ton of TLC.

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Old

06-13-2009, 12:58 AM

#2

Moderator

Join Date: Mar 2000

Location: Littleton, CO USA

Posts: 39,550

Car: 82 Berlinetta(2)/57 Bel Air

Engine: LS1 (LS1)/LQ4

Transmission: 4L60E (T56)/4L80E

Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

Classifieds Rating: (11)

Quote:

Originally Posted by TiredRS

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1) A stock 305 swirl port head has a 58cc combustion chamber, correct?

Correct.

Quote:

Originally Posted by TiredRS

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2) What would happen if I put 64cc Vortec heads on my LO3? I would assume lower compression.

Correct. About half a point or so. You could have the Vortec heads shaved to reduce the chamber size and raise compression back up.

Quote:

Originally Posted by TiredRS

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3) Are there a set of 58cc Vortec heads? Anyone know where to find them?

Yes, but they aren't the same good ports and chambers of the 350 Vortec heads.

Quote:

Originally Posted by TiredRS

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4)Will all factory accessory brackets bolt on?

Yes.

Quote:

Originally Posted by TiredRS

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5) Does bore size play a role in selection of small block heads? i.e.- 305 bore vs. 350 bore.

To a small extent, but not for stock heads with 1.94/1.50" valves, or even 1.94/1.60" valves.

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06-13-2009, 02:33 AM	#3
TiredRS Junior Member Join Date: Apr 2009 Location: Wichita, KS Posts: 29 Car: '91 Camaro RS Engine: 305 Transmission: 700R4 Axle/Gears: 2.73 Classifieds Rating: (0)	Re: LO3 Head Options Thanks for the answers man! __________________ '91 Camaro RS, 305, Automatic, needs a ton of TLC.

Old

06-13-2009, 02:33 AM

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1992 Camaro

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		Third Generation F-Body Message Boards > Tech Boards > Engine Swap
LO3 Head Options

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