AutoNewb

completely out of left field...

would it, could it fit, and has anyone seen one? obviously the cost is insane, but im curious none the less to hear of any.

97WS6SCharged

Are you talking about a 427CID small block or the old fashion big block version?

teke184

there are several guys around here running 454s and 455 in camaros and firebirds...

install is fairly straight forward...do a search

although i always wanted to put a 427" small block into an iroc...with full road race suspension and a 6spd transmission

OutsiderIROC-Z

Someday my 1983 Firebird will have a built 427 BBC in it.

kandied91z

seen many sbc versions over the years since the parts have been available. just pricey but all things motor related are.

Ucantcme57

I have a 427 SBC, Well it's close.. anyway.. If you wanted a 427BBC you will need a new K member someone was selling Kmembers that the motor mounts were lower so the bbc would fit under a stock hood...I will try and find it..

MRBIGBLOCK

Ive Got A 472 In My Car Wich Is A Stroked 427. It Is Awsome Car To Drive. Did Not Have To Buy A K Member.although It Is In The Plans.headers Are The Only Prob. However There Are A Few Options Out There.

Stephen 87 IROC

396 - 540 BBC engines are all the same externally. The only difference is if you have a BBC truck block. That's the 366T and 427T (6L and 7L) blocks used in medium and heavy duty trucks (not pickups). Those decks are 0.400" taller because the pistons have an extra compression ring. Anywhere a 396 will fit, you can also stuff a 540.

The engine mounts on a BBC are in the same location as a SBC. The difference is that the bore spacing is farther apart so the block is going to be slightly longer. Since the engine mounts and tranny position are in the same spot, the extra length goes forward towards the rad.

A special crossmember is not needed. I use a 7 qt deep pan and Hooker Supercomp headers with mine.

Since the original poster hasn't specified if the 427 is a BBC or one of the highly modified SBC versions, we'll have to assume it's a BBC.

IgorT.455/406

Hey, will the 427T block engines fit? Only thing I could see that would be in the way is the headers not fitting right, maybe windshield wiper motor. I might have a chance to get a 427T engine (or maybe just a block), and I would like to build a 505 possibly!

MRBIGBLOCK

They May But It Would Be Tuff Man Its Tight With My Short Deck Block

Stephen 87 IROC

The taller deck height does cause problems. If you're willing to do fabrication work, anything will fit. typically everyone uses the Hooker Supercomp headers for the BBC swap. They're not the best fitting even with a short deck block but they're the cheapest to buy. If you used them, they would sit higher and mine already sit up against the bottom of the floor and front subframe.

The taller deck also means heads and valve covers sit higher. In a street car with a wiper motor and heater/AC system, this can cause more clearance issues. 0.400" doesn't sound like much but it can add up in tight areas.

Tall deck intake manifolds are available for just about every application but a regular intake manifold can be used with special spacers.

427T blocks have lots of potential. The 366T blocks are boat anchors. Most of them can be safely bored out 0.125" over. That's only a 4.375" bore. You can simply buy an aftermarket 4.5" bore block and build a 502 or stroke the 502 and make a 540. The nice thing about the truck blocks is that it gives you a better rod length/stroke ratio. A special order crank can be used in any block but common stroke lengths for BBC is 4.0", 4.25" and 4.5". An exotic crank is 5.0" stroke but it will only fit in high end aftermarket blocks. That's for building things like 632 engines.

IgorT.455/406

Cool, thanks.

Are 366s good for anything? What about just a 366 bock, can it too be safely bored same as 427s? Thanks.

Stephen 87 IROC

The 366T is a boat anchor. It has no performance potential. Sort of the 305 version of the BBC.

IgorT.455/406

Cool, thanks a lot! I'll see if I can score a 427T from my buddies dad.

Stephen 87 IROC

An old one is nice but a GenV is better. The genV block doesn't have a fuel pump boss for a mechanicla pump. It uses a steel crank and 4 bolt mains. It has a one piece rear main seal. They have oil cooler ports near the filter base. The GenV blocks have 6.0L cast in the side of the block for the 366 and 7.0L for the 427. the stock intake manifolds have 2 thermostats.

The 427 is the same bore of 4.250" as the 454 but a shorter stroke. The 366T only has a bore of 3.935 but can also be bored out 0.125".

The truck blocks have thicker cylinder walls than the car blocks because they work harder and need to disipate heat without having cylinder wall deflection. This is why they can be bored out so much. All the truck (tall deck) blocks are 4 bolt mains.

You can take a 427T block and put a 4" stroke crank into it to make a 454. All the taller deck does is improve the rod/stroke ratio. No extra CID is gained from the taller deck. I improved my ratio by using a 0.250" longer con rod in my 454 with special pistons designed for the longer rod.

Con rods and pushrods need to be 0.400" longer in a tall deck block (stock parts not recommended for performance use). As mentioned above either a special tall deck intake manifold is needed or special spacers to allow a car intake to be used. Spacers are commonly available.