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Ported Chevy 083 heads, the tpi project

General engine tech -- Drag Racing to Circle Track

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Carnut1
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Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:10 pm

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Project for a friend, 87 tpi engine. 083 cylinder heads pictured washed with oil from honing the k line guides.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:15 pm

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083 cut for 2.02" /1.6" valves. The stock seats and guides were hammered.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:20 pm

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Rough out
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:24 pm

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1st design for flow tests.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:33 pm

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1st flow test. These are very similar to what I did in the 90's for the old work truck's 355 that I still drive. Not spectacular but close to Vortec bowtie flows.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:44 pm

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With 1st cut on head I started flowing parts of the tpi manifold to determine where the restrictions are. Stock tpi base knocked flow @.5" to 208 cfm, stock tpi tubes added 193 cfm, aftermarket siamese runners 183 cfm all with clay radius.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 1:58 pm

Resized_20190127_154214_5974.jpeg
Ported base brought flow @.5" up to 223 cfm with clay radius.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 2:10 pm

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Ported stock tpi runners bring flow @.5" to 200.5 cfm, ported aftermarket runners 190 cfm. The aftermarket runners are full of restrictive bulges. You will need a good sonic to get a decent shape. Stock tpi runners has very little metal to remove.
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Last edited by Carnut1 on Sun Mar 03, 2019 2:37 pm, edited 1 time in total.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 2:16 pm

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After and before tpi plenum. This needs lots of work for the aftermarket throttle body this project will have.
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Re: Ported Chevy 083 heads, the tpi project

Post by PRH » Sun Mar 03, 2019 2:18 pm

What did the stock head flow?
Stock head with stock base?
Stock head with stock base and stock tubes?

The work looks good.
Somewhat handy with a die grinder.

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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 2:26 pm

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After and before aftermarket throttle body.
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 2:31 pm

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PRH wrote:
Sun Mar 03, 2019 2:18 pm
What did the stock head flow?
Stock head with stock base?
Stock head with stock base and stock tubes?

The work looks good.
I knew it would all get some work so I wasted no time flowing stock heads. I doubt they flow much above 200 cfm which seems a bit more than the stock system will flow. Thanks, Charlie
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Re: Ported Chevy 083 heads, the tpi project

Post by Carnut1 » Sun Mar 03, 2019 3:27 pm

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083 ported head 2nd port design, ported stock base, ported aftermarket siamese runners, ported stock plenum and ported aftermarket throttle body on bench. @ .5" lift 195.2 cfm. Pathetic.

Ported stock runners on same setup @ .5" lift 199.2 cfm
This was after quite a bit of work to aftermarket runners.Thanks, Charlie
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Re: Ported Chevy 083 heads, the tpi project

Post by PRH » Sun Mar 03, 2019 4:01 pm

Do you have a decent single plane and carb you could try on it?
Somewhat handy with a die grinder.

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Re: Ported Chevy 083 heads, the tpi project

Post by RevTheory » Sun Mar 03, 2019 4:16 pm

Wow, that TPI is a real buzzkill.

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