BK N 66

all the high performance engine builders that i talk to keep telling me
that they cannot believe my engine is still together and has not blown up
by now?

they keep telling me that high compression engines will not last and i
cannot expect to get much life out of my motor as it is 10 & 3/4
compression ratio motor.

the fact is my motor runs like a brand new motor. is dependable and
i would not hesitate to drive the car anywhere.

i do not abuse the motor and change my oil regularly every 3000 miles.

i do like to wind it up and blow out the carbon on the freeway.

my motor like the higher rpm range and like to cruise at 80 to 90 mph
on the freeway. it has been built for highway use with 336 rear end
ratio. however, it likes to be pushed on the rpm side of 6500 rpm.

it really starts pulling hard at around 6800-7200 rpm. i do not
push it that hard and only take it over 6500 rpm once in a while.

i really enjoy the smoothness of the engine and it just purrs like
a kitten.

it is not a daily driver but i do drive it on weekends and a lot during
the summer months. the 450 HP motor gives me great pleasure and
more than enough power to go anywhere and have fun with it.

the motor probably has a little over 7500 miles on it. again it still
runs like a brand new car and just purrs like a kitten. it seems to me
that the more miles i put on it the better it runs?

so here is my dilemma. why does everyone tell me that the motor
will never last and should have been blown up by know???

was wondering how many miles can i expect to get out of this nice
big little small block???

thanks for any opinions or insight.

tuxnharley

It would take a whole lot more information and specifications about what your engine is before anyone could offer an informed opinion and reply to your question.

63split63

If you keep pushing it to 7,200 and more and running 80 - 90 mph with 336 rear gear, you will soon prove everyone is right about it blowing up .
But what the heck if you are having fun and can afford it .
Bill

MikeM

You don't have a delimena unless it flies apart. May not happen in your lifetime. Why worry? Find other company to keep. They may be waiting to pick your pocket.

Frankie the Fink

Then talk to different people

ifitgoesfast

bench press max, big fish stories, 2 women, was supposed to be an astronaut, etc...

GCD1962

Find a new "high performance engine builder" The ones you are talking to all full of s.......t. I have a 70 LT-1 short block, in my '62 with over 40k miles. It's been in there since 1972. It's been "over-revved" more than a few times over 7,000rpm. No problems at all. Run it like you own it !!!

BK N 66

what other information do i need to provide?? will be glad to provide more info??
thanks

Frankie the Fink

Ever think all those 'high performance engine builders' want to convince you your mill is on the knife's edge of grenading itself so they can get some work ?

GTOguy

I have a 10.75-11:1 big cammed tripower 389 in my '65 GTO that I built in 1981 that's still running strong after much abuse early on. Has about 60k miles on it, has never been opened up, and is still oil tight. I checked all of the clearances and measurements during the build, and the machinist was spot-on. Oil changes every 3000 miles, regular dino oil. I expect it to outlive me at this rate..........

BK N 66

GCD

mine is also a 1969 four bolt main LT1 motor that has been bored 30 over. it has
roller rockers. big AFR aluminum heads and a 750 holley double pumper. msd ignition.
dynoed at around 450 horses with over 400 pounds of torque. i think i should hope to
get at least 60-75 thousand miles on this motor as long as i dont abuse it and keep the
oil changed?? what do u think??

Donny Brass

take it to Mike and Sandy's guy, he will blow it for you

Jbabek

Just out of curiosity, how do they say it will fail? If you have good clean oil and sufficient pressure, then wear should not be an issue. Are they suggesting the rods/crank/block/head bolts will fail?

GCD1962

Mine runs over 400HP too, and I don't give it a second thought about "wearing out". The LT-1 short block and other items were all assembled with high quality parts, Why wouldn't it last? Less expensive motors with cheaper quality parts will not last as long as the LT-1.

As a sidelight. I have a good friend who has a 60s Plymouth that was a national record holder many times over. When I saw him a few years ago, he said after the motor was built, it was never apart ! He probably put thousands of miles on the car, 1/4 mile at a time and never had an issue, and the car consistently turned the same ETs, and MPH. Drive your car and enjoy it - don't listen to what others say. I have over 45k miles on mine

63Corvette

http://www.hotrod.com/how-to/engine/...nnecting-rods/

GCD1962

The LT-1 had the very strong "pink" rods. wouldn't mess with them

dplotkin

Well...ahem, it was a Mopar after all, probably an RB block, don't need to do much inside one of those to make ungawdly power and it's awfully hard to break one...just saying.

Dan

63Corvette

Con rods are "consumables. They have a certain number of hours at a certain speed, then must be replaced. I ran thru MANY "pink" rods, and they ran thru my cylinder blocks. there is a huge difference between a RACE engine and a street engine which occasionally sees a few high RPM runs thru the gears, or even a DRAG race engine, which sees "race" events of 12 seconds, My 13:1, 412hp 327cid engine runs Carillo rods on a billet crank with Mahle pistons. They (may) last for one season. My engine is built for reliability, not power. The high horsepower engines start at 500hp and $25,000, and last for....whatever, depending on your rev limit. REAL "fast guys", run 15:1 NASCAR based engines of LOTS of HP, cost $50,000, and are "refreshed" every race event! Still, even those use a rev limit of around 6500+ rpm. The 302cid engines and Boss 302 Fords run 9000 rpm!

BK N 66

i believe the hi performance engine builder told my friend who built my engine that the
main reason the motor would not last is because he did not put new 9 to 1 flat top pistons
in my motor when he reassembled my motor. he stated that my old 11 to 1 pistons that
were aluminum double domed top pistons were too much compression and had to much
clearance in the cylinders. in other words he said the tolerance was to much inside the
cylinder walls? the only reason my friend who built my motor used the same pistons is
because he said the old pistons looked really good and just cleaned them up and put
them back in my motor. he was just trying to save me 5 or 600 dollars so i would not have to buy new pistons. i did have some detonation problems at first but my friend
finally got rid of it and dialed my motor in. it sure runs good now no detonation,

GCD1962

361 CI. Ran C/SA. Didn't have the heads off for nearly 50 years !