Discussion in 'The Garage' started by BigBurban350, Oct 9, 2002.
When was the 427 big block in production? Are those blocks rare?
60's, later side. You could get one in a '68 Chevelle (dealer installed). I think the 454 replaced it.
1966-1969. Still running the tall deck truck version. /forums/images/graemlins/usaflag.gif
They are getting pretty scarce, but the block is the same as a 454, and the crank is the same as the 396. It isn't hard to find the parts to make a 427, but why when you can have 454 just as easy? /forums/images/graemlins/thumb.gif
Looks like '66-'69 for 427 short decks.
Some of the casting numbers for 427T are '69-85 which are the Tall deck truck blocks with a 10.2" deck height vs the 9.8" deck height.
I have a 427 tall deck block in my garage with a casting date of '72. hmmmm that would go good in my '72 K5!
If you want to spend some bucks on the machine work building a stroker big block, the tall deck blocks are sweet because you can stuff a .400" taller stroke of a crank because of the taller deck height. /forums/images/graemlins/thumb.gif
A 454 has terrible rod/stroke angles and that creates a lot of stress on rods and pistons. Also the stroke is very long and that increases piston speed putting alot of stress on the crank, rods, and pistons. A 427 has a shorter stroke allowing for higher RPMs where the power is at. If you can put a longer rod in that will make a better rod/stroke angle decreasing stress on engine parts so the engine can run at higher rpms or use nitros. I want to build a 427 with a longer rod, but I didnt know how hard it is to find parts. Thanks for the input too. /forums/images/graemlins/burb.gif
forged 396/427 cranks are pretty easy to come by if that is the route you plan to take. The 427 is a good motor, but I prefer the low end torque of the 454 for offroad use.
I'm really intrested in a 502 big block. They've beenn around for a few years now so prices should get more afordable. Anyone know much about the 502 ??? Like the low end torque for off roading. I've been drueling over http://www.hotrodlane.cc/chrome502ramjet.html /forums/images/graemlins/pimp1.gif /forums/images/graemlins/pimp1.gif /forums/images/graemlins/pimp1.gif
Just a thought.....I've found 427's, 454's in old jet and flat bottom boats. If you keep an eye open, you might find one in a trashed boat that will have alot of good parts on it. You just have to find a place to dump the boat....
/forums/images/graemlins/k5.gifLet me know if you have any luck.. /forums/images/graemlins/k5.gif
That is a sweet motor and the FI would be killer in our applications. If your wallet is thick enough, go for it!
I would love to have the ram jet 502 but I already have a 454 hanging on an engine stand in my shop.
yeah i hear of 454s wearing out in a few minutes due to the bad rod ratios /forums/images/graemlins/rolleyes.gif
I have a 454 sitting at the house....had it in a boat that turned 8300rpm's going 137mph....and it loved it, wanted more....one day, I'm thinking, in the K5????
/forums/images/graemlins/angryfire.gif <font color="red">LETS GO ANGLES </font color> /forums/images/graemlins/angryfire.gif
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