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Discussion Starter · #1 ·
I am building a N/A 4.6L to turn some RPMs and be a nice street/strip car.
Topend is proven heads/cam combo that went mid 10's N/A and made 430 RWHP on a 5.0 stroked 4.6L.
I have a Cobra crank already and a Teksid block.

My question is how much would I gain with a re-sleeved BB stock stroke over a .020" stock stroke? or would a .020" stroker gain much over a .020' stock stroke?
Is the extra cost worth the gain? My goals are bottom 11's-high 10's N/A and add a 150 shot for occasional extra fun :D


No matter what will be 11:1-11.5:1 compression and high RPM's topped with 5.5" PSR Mach1 intake and Roy's 7/8" spacer with Accufab Oval blade T-body backed by a Pro-motion 3650/Spec 3+ and 4.10 built rear in a 98 Cobra
 

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Discussion Starter · #4 ·
Well I bought a Kellogg 3.800" Stroker Crank and Manley 5.85" H-beams(too good of a deal to pass up)
Now I am just torn buying a Boss Block and going 3.700" bore or to just bore my Teksid .020"
It would cost more to re-sleeve my Teksid than buying a new Boss Block so re-sleeving is not a option anymore.

Realistically how much HP is a 3.700" BB worth over a .020" bore?
 

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Do not spin a 3.8" stoker over 7500rpm.

The duration of your cams will support high RPMs (7500-8000) only if used with a 5" short runner and 302ci or less. In a 302ci combo expect peak to occur at 7500 and with 281ci expect peak to be around 7900.
Adding cubic inches by going with a 3.7" bore block will result in peak power occuring around 6800rpm.

A 3.7" bore is worth 20-25rwhp as is a 3.8" stroke.
 

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Discussion Starter · #6 ·
Going to buy a Boss Block now.
Wondering if I should have my combustion chambers unshrouded to the big bore(gotta have one chamber repaired anyways) price would be minimal since heads are going to be gone thru completely and repaired.
 
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