427 tall deck Replacing the 307 in my 71 Chevelle ,    Should  I  ? - Chevy Forums at Chevy High Performance Magazine Chevy High Performance

427 tall deck Replacing the 307 in my 71 Chevelle , Should I ?

  
User Name:
Password:
Join FREE Now!
Forgot Password?
Forgot User Name?
Remember Me
Get Adobe Flash player
Home | Active Posts | Search | Register | Terms | FAQs
Rss
Item Posts    Sort Order

427 tall deck Replacing the 307 in my 71 Chevelle , Should I ?

 
pistonrod pistonrod
New User | Posts: 1 | Joined: 12/08
Posted: 12/30/08
04:34 AM

I  Picked up a 71 chevelle that Has the 307sb in it about 6 months ago and  have been building a 355sb to replace it.  ( I am almost done except buying a cam and installing it )      over the holiday I came across a 427 tall deck   out of a grain truck I do believe .        Well I couldnt do without everyone needs a 427 BBC talldeck laying aroud right . So now I am wondering if I can make this 427 BBC produce enough power/toruge  by changing just the cam and intake to outperform the 355  ?  

 
kychevy68 kychevy68
New User | Posts: 1 | Joined: 04/09
Posted: 04/14/09
09:49 PM

tall deck 427 have a deck height of .400 over your typical BBC this was to accommodate pistons with a 4th piston ring to improve life and reduce blow by in hard use applications such as extreme weight of a grain truck under load. they dont have high compression and they typically have very small port heads. the block itself would be good for a stroker motor if it checks out at the machine shop and they say it could be bored out to say 4.5 inches for a 540. but if you built a decent 350 then you are better off with that. just changing a cam and intake on an engine doesnt make enough of an improvement to justify the swap. its a total package. if your heads cant support the cam and intake then it would just be wasted effort.

if the block checks out you could use it for a stroker application or theoretically you could use a .400 longer rod and stock car 427 pistons if you wanted a 427.

also all grain trucks 366 and 427 had forged steel crank shafts so the crank would work if you tried a 427 build.  

 
SMOKESHOW SMOKESHOW
Guru | Posts: 958 | Joined: 09/08
Posted: 04/15/09
07:07 PM

I would stick to the 355.  

 

Chevrolet Corvette Research
Chevrolet Corvette Find new Chevrolet Corvette information as well as review photos, specs and more. Check the available rebates for the Corvette, which will help you save money on your next new car purchase. It is available in the following bodystyles: Coupes, Convertibles. The Chevrolet Malibu and the Chevrolet Impala are other vehicles that might interest you.