BBC HEADS # 10101140 Does anyone know more than mortec about them?

[74_schiada_flat]

i just got a 427 talldeck cast # 10114184
with a set of heads cast # 10101140
Mortec doesnt tell me anything on the heads other than oval port closed chamber.
I know this is a good block but are the heads any good?
also somebody told me that there was a way to stroke it with longer rods and turn it into a 511. is that true?
if so how?

[GofastRacer]

Well if you're going to build a big motor to make a bunch of power those heads are not going to cut it, they're good heads for the street though!... The block is from pre 454 days so it won't accept a 454 crank as is so you will have to do some clearancing on the bottom of the cylinders and you can put a .250 stroke in it and bore it .060 and make a 496, to make a 511 you need to go .125 over, even though those old blocks are thick walled, I would still get it sonic checked for core shift!....

[Fiat48]

That block number comes up Gen V...which I am not familiar with. Gen IV is all I know.
Does that block have a one piece rear seal or 2 piece?

[74_schiada_flat]

Well if you're going to build a big motor to make a bunch of power those heads are not going to cut it, they're good heads for the street though!... The block is from pre 454 days so it won't accept a 454 crank as is so you will have to do some clearancing on the bottom of the cylinders and you can put a .250 stroke in it and bore it .060 and make a 496, to make a 511 you need to go .125 over, even though those old blocks are thick walled, I would still get it sonic checked for core shift!....
i have some 291 heads that i was going to sell to recoupe some of the cash i spent on the motor.
should i keep them?

[GofastRacer]

Wow just looked up the numbers, something don't make sense, it says 427 but it says 91-92 they quit making 427's a long time ago!.. :confused: :confused:

[74_schiada_flat]

Wow just looked up the numbers, something don't make sense, it says 427 but it says 91-92 they quit making 427's a long time ago!.. :confused: :confused:
so what do you think?

[GofastRacer]

i have some 291 heads that i was going to sell to recoupe some of the cash i spent on the motor.
should i keep them?
I would sell them, not worth putting money into them, they would be good for a tow vehicle though!..

[GofastRacer]

so what do you think?
Get it magged and sonic checked and go from there!..

[Fiat48]

There was a remake of the 427 tall deck that were thin wall castings. I know how to identify if it is a Mark IV. Check that rear main seal.

[GofastRacer]

There was a remake of the 427 tall deck that were thin wall castings. I know how to identify if it is a Mark IV. Check that rear main seal.
Hmmm, guess I missed something I thought they brought it back out as a Bowtie block!.. :confused:

[Daytona100]

According to my book part # 10101140 are oval port closed chamber 1991 Gen5 366T and 427T heads. The block numbers dont check out. Gen 5 blocks have tin timeing covers and Gen 6 blocks have cast aluminum timeing covers. Hope this helps. :idea: :idea:

[74_schiada_flat]

Hmmm, guess I missed something I thought they brought it back out as a Bowtie block!.. :confused:
yes it most likely is a bowtie block as it came out of a 92 school bus with 39,000 miles on it.

[GofastRacer]

yes it most likely is a bowtie block as it came out of a 92 school bus with 39,000 miles on it.
If it's out of a school bus it ain't a bowtie no how!..

[Fiat48]

Hmmm, guess I missed something I thought they brought it back out as a Bowtie block!.. :confused:
Yeah, they did that also. 14044808 was the bowtie tall deck. Siameze. But this other deal was not. Chevrolet needed old tall deck 427 cores for their remans and tooled up and made this other thin wall casting.

[steelcomp]

yes it most likely is a bowtie block as it came out of a 92 school bus with 39,000 miles on it.
Um...not likely. I know there were some 427's in the early 90's...the Atlas Gas delivery truck here in town's gone through three of them! (Friend drives for them) Not sure why, but I suspect they're not a good cantidate for anything real hi-po. It's no BowTie block, that's for sure.

[Fiat48]

If it's out of a school bus it ain't a bowtie no how!..
LOL. Bowtie in a school bus. :D

[74_schiada_flat]

so the motor is no good in other words?
i was just going to put my heads
a full crane roller setup
and a tunnel ram with 2 660s on it.
all the stuff i already have.
if it's no good then i will sell it for what i paid and keep looking.
whats your guys advise?

[Fiat48]

You still need to identify that block before anybody knows. Check the seal as I said above. Also...if it is a tall deck....it will have a riser tower cast right into the front of the block near the timing cover...and that tower will probably have an 1/8" pipe plug in it.
I think it is a low deck 427 2 or 4 bolt main Gen V 91-92.

[steelcomp]

so the motor is no good in other words?
i was just going to put my heads
a full crane roller setup
and a tunnel ram with 2 660s on it.
all the stuff i already have.
if it's no good then i will sell it for what i paid and keep looking.
whats your guys advise?
Unless ytou were running a tall deck before, you'll either need a tall deck intake, or spacer plates for your existing intake.

[74_schiada_flat]

Unless ytou were running a tall deck before, you'll either need a tall deck intake, or spacer plates for your existing intake.
i have spacers.

[74_schiada_flat]

You still need to identify that block before anybody knows. Check the seal as I said above. Also...if it is a tall deck....it will have a riser tower cast right into the front of the block near the timing cover...and that tower will probably have an 1/8" pipe plug in it.
I think it is a low deck 427 2 or 4 bolt main Gen V 91-92.
heres what ed has to say.....
That tall deck block is a one piece rear seal block with 4-bolt main caps. ALL Gen. V blocks have them. the heads are low performance truck style heads.
ED
MorTec
email1@mortec.com

[74_schiada_flat]

heres what ed has to say.....
That tall deck block is a one piece rear seal block with 4-bolt main caps. ALL Gen. V blocks have them. the heads are low performance truck style heads.
ED
MorTec
email1@mortec.com
So what do you guys think?

[Fiat48]

I say to Hell with numbers. Confirm it is indeed a tall deck. T could be truck. Truck doesn't mean tall deck.

[74_schiada_flat]

I say to Hell with numbers. Confirm it is indeed a tall deck. T could be truck. Truck doesn't mean tall deck.
and if it is a tall deck?

[Fiat48]

LOL. Then you will know it's a tall deck. You can stroke either a low deck or a tall deck to get more inches as you were looking for in your first post. 496 inches is a given. More depends on the wall thickness.

[GofastRacer]

If indeed it is a 90's block, I wouldn't go anymore than .060 over!..