Suggestions For 355 Build

The short block is from atk it is supposed to be a 330 hp with vortec heads. I got it in a trade that is all I know about it. Right now I have headman shorty headers with a 3” intermediate pipe and single exhaust magnaflow muffler. This is going to be a street/strip car that will be driven to the strip. I will check the piston to deck height. I want to be able to use 87-89 octane gas.
 
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I would use a bridge and measure how far in the hole the pistons are first then calculate out my head volume cc from there to put compression where I want it after selecting a cam. Do the math make the plan order the parts. Dyno sim programs work nice as long as you are honest with the program.
 
Also remember posted flow numbers are an average not set in stone but definitely a good reference. heads are big power adder on a sbc Chad Speier Racing Heads or Mamo Motorsports are ideal if funds allow. If you get your info on the engine by measuring it with some easily bout tools you can get they're suggestion. Just got to be honest about your car and it's intended use.
 
Prolifer 195 70cc
I just ordered these heads with .028 head gaskets. Still working on camshaft selection.
Thanks again for all the help.
 
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when the cylinder heads do arrive please post clear pictures of them from several angles, and sides:D
remember too closely inspect for micro machining and packing material, trash,
machine chips and broken or missing or incorrectly installed components,
as you would normally do with ANY new part from ANY manufacturer

http://garage.grumpysperformance.co...on-building-a-383-sbc-stroker.428/#post-61899

http://garage.grumpysperformance.co...-loads-and-installed-height.10709/#post-46662

http://garage.grumpysperformance.com/index.php?threads/valve-seat-runout.15104/#post-86013

http://garage.grumpysperformance.com/index.php?threads/valve-seat-runout.15104/#post-86013

http://garage.grumpysperformance.co...ring-installation-questions.12833/#post-66442

http://garage.grumpysperformance.com/index.php?threads/valve-seat-runout.15104/#post-86003

http://garage.grumpysperformance.com/index.php?threads/how-to-lap-valve-seats.1159/#post-2362

http://garage.grumpysperformance.co...or-piston-dome-or-port-volume.2077/#post-5565

http://garage.grumpysperformance.co...and-setting-up-the-valve-train.181/#post-1397

http://garage.grumpysperformance.co...on-building-a-383-sbc-stroker.428/#post-61899

 
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NO MATTER WHO THE VENDOR OR MANUFACTURER IS,
CLOSE INSPECTING AND CLEANING , OF ANY AND ALL COMPONENTS, IS MANDATORY BEFORE ANY USAGE
from the limited posted pictures ,
the heads appear to be in nice shape
got any showing the intake and exhaust ports from both sides?
 
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your result should be better as youll have much better heads
 
I think the SCR and DCR are a bit too low. When you changed the cam timing to 2°, you went the
wrong direction with your IVC in the calcs below. The IVC would go from 67° to 69°, not to 65°
like in your calculations. The cam has 4° advance ground into the cam, when you changed to 2°
advance, you were actually retarding the cam timing.

LSA - ICL = Cam Timing Advance
110° - 106° = 4°

upload_2019-9-30_16-31-36.png

Carp1329_DCR_Calcs.JPG

I did some more calcs with a few different options. Check the notes at the bottom of
the graphic below to see what changes I made from one engine to the next.

DCR02.JPG
 

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