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LQ9 Heads and Cam question

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Old 03-02-2017, 11:44 PM   #1
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Default LQ9 Heads and Cam question

I currently have an LQ9 block with stock 862 heads and a 222/224 cam with 112 LSA. I have an edelbrock Performer intake with a Holley 4150HP.

I want to put on some ported 243 heads and a cam that is 235/243 with a 113 LSA. Lift is .621/.624. The heads have a 5 angle valve job and .650 BTR springs.

I'm trying to figure out what the compression ration will be and what head gaskets to use. I'd like to keep it around 10.5 and no higher than 11.1.

I was told I should swap the intake for a Victor Jr.

This will be in a 1970 Nova with a 200R4 with a 2800 stall converter and 3.55 gears.

I also have a 150 shot of nitrous that I rarely use. This is a weekend fun car and not a track car.

I'm worried about PTV and too high of a CR. This is my first build so I'm not sure how this combination will work all together.

Any advice or comments are welcome.
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Old 03-03-2017, 01:35 PM   #2
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http://www.csgnetwork.com/compcalc.html
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Old 03-03-2017, 01:41 PM   #3
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Originally Posted by Rodney21 View Post
I currently have an LQ9 block with stock 862 heads and a 222/224 cam with 112 LSA. I have an edelbrock Performer intake with a Holley 4150HP.

I want to put on some ported 243 heads and a cam that is 235/243 with a 113 LSA. Lift is .621/.624. The heads have a 5 angle valve job and .650 BTR springs.

I'm trying to figure out what the compression ration will be and what head gaskets to use. I'd like to keep it around 10.5 and no higher than 11.1.

I was told I should swap the intake for a Victor Jr.

This will be in a 1970 Nova with a 200R4 with a 2800 stall converter and 3.55 gears.

I also have a 150 shot of nitrous that I rarely use. This is a weekend fun car and not a track car.

I'm worried about PTV and too high of a CR. This is my first build so I'm not sure how this combination will work all together.

Any advice or comments are welcome.
An LQ9 with unmilled 243 heads is essentially an iron blocked LS2. The compression ratio with a factory gasket is 10.88:1.
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Old 03-05-2017, 01:03 PM   #4
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Thanks guys. Would a dual plane or single plane intake be better for this setup?
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Old 03-05-2017, 04:01 PM   #5
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With a 2800 stall you could go either way. With that 235/243 on 113 camshaft, i would run the dual plane on your combo.
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