2.08 Intake on a 400 .030 Overbore - Team Camaro Tech
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post #1 of 8 (permalink) Old Jan 17th, 08, 11:44 AM Thread Starter
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Shannon
 
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Question 2.08 Intake on a 400 .030 Overbore

Have a small block 400 thirty over with a set of Dart Pro 1's 2.08 intake and 1.60 Exaust Anyone forsee problems on a street strip car. Compression will be 11.3.

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post #2 of 8 (permalink) Old Jan 17th, 08, 11:54 AM
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Re: 2.08 Intake on a 400 .030 Overbore

Don't quite understand your question. Are you asking if the valve size will cause a problem? Or maybe you are asking about piston to valve clearance?

'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
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post #3 of 8 (permalink) Old Jan 17th, 08, 12:00 PM Thread Starter
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Re: 2.08 Intake on a 400 .030 Overbore

Engine runs but is set up with a 1050 carb and a drag cam. Wondering about the valve size. Every thing I find puts it borderline.Just looking for clarification.Thanks for cathing that slip up.

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post #4 of 8 (permalink) Old Jan 17th, 08, 12:18 PM
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Re: 2.08 Intake on a 400 .030 Overbore

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Originally Posted by 76' Bad Bird View Post
Engine runs but is set up with a 1050 carb and a drag cam. Wondering about the valve size. Every thing I find puts it borderline.Just looking for clarification.Thanks for cathing that slip up.
Still don't quite understand, but I'm running AFR 210 heads on my 355 with 2.08" valves. That valve size shouldn't be a problem in your 406.

'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
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post #5 of 8 (permalink) Old Jan 17th, 08, 03:27 PM
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Re: 2.08 Intake on a 400 .030 Overbore

2.08's should be ok... but that 1050 carb and only 11.3:1 ? I see the carb as an issue.

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post #6 of 8 (permalink) Old Jan 17th, 08, 03:55 PM
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Re: 2.08 Intake on a 400 .030 Overbore

Ditto on the carb issue. I can tell you for a fact that 2.08's fit a std 400 bore. I've got AFR210's on my 427. Now with Steve's combo I would have some clearance concerns.


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post #7 of 8 (permalink) Old Jan 17th, 08, 05:05 PM
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Re: 2.08 Intake on a 400 .030 Overbore

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Originally Posted by HarleyD67 View Post
Now with Steve's combo I would have some clearance concerns.
They bolted right on without any clearance problem. Been doing fine for 8 years now. Here is how it performs:

My '69 Camaro running 10.47 @ 129MPH with a 1.52 sixty foot at Sacramento Raceway. 355 SBC with a 150 shot.

'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" billet rods, Ross pistons (10:1), Total Seal rings, AFR 245 heads, T&D steel body shaft rockers, Cloyes Timing set, custom ground 4-7 swap solid roller 274/286 @ .050" with .704" lift, Dart single plane, Holley Dominator EFI on E85, Injector Dynamics ID2000 Injectors, Stef's #1705R oil pan, F2 Procharger, Lemons 2" primary 4" collector, ATI 9" blower converter
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post #8 of 8 (permalink) Old Jan 17th, 08, 05:25 PM
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Re: 2.08 Intake on a 400 .030 Overbore

Quote:
Originally Posted by 76' Bad Bird View Post
Have a small block 400 thirty over with a set of Dart Pro 1's 2.08 intake and 1.60 Exaust Anyone forsee problems on a street strip car. Compression will be 11.3.
That's actually a good combo. (Have made some decent power with those "Pro-Ones" also!)

On a recent build (with a "Dart" block) 406" 11:1, Pro-Topline 235's (2.080's), a "small" solid roller, and a "Victor" with a 4500 and 2.000" primaries unit cam off the dyno @ 610 HP.

Is in a "street/strip" ride now, 3600#+, and runs 10.70's @ 124 MPH. All on 93 octane!

Thanks, Gary in N.Y.

P.S. In all honesty, a 2.080" valve or larger actually hurts the overall performance on a 4.000" SB (either +.030" or +.060"). The larger valves end up experiencing flow issues with the cylinder walls. We just delivered a 383" SB with 550+ HP using some 2.020's (older Brownfields) and 93 octane also! These are all slightly "higher-end" solid-roller units, not "budget-builds"!
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