454 ?s
Thread Starter
Melting Slicks
Joined: Jun 2001
Posts: 3,281
Likes: 6
From: NC USA
454 ?s
How do you tell if you have the regular passenger 454 Mark IV block or the Bowtie Mark IV block?
I've heard that the Bowtie blocks have siamese cylinders and are better but am not sure why. Any
responses to better understand this are appreciated. My 91 crate engine casting number is
10051107 which I was told is a Bowtie block. I have the GM rectangular port iron heads and a GM
hirise alum intake. I'm pretty sure I have a GM mild hydraulic flat tappet cam and am considering a
new roller cam but am not sure whether to go hydraulic or solid. I've heard that solid lifter cams are
more maintenance but am unsure what that means. I'm considering a cam/intake upgrade. Again,
your patience and comments with me (engine/cam challenged!) are greatly appreciated. This is not
a daily driver and visits lots of cruise-ins and the strip 4-5 times a year. Other relative info is in my
sig. Thanks for your help.
(Also posted in Engine Mods)
I've heard that the Bowtie blocks have siamese cylinders and are better but am not sure why. Any
responses to better understand this are appreciated. My 91 crate engine casting number is
10051107 which I was told is a Bowtie block. I have the GM rectangular port iron heads and a GM
hirise alum intake. I'm pretty sure I have a GM mild hydraulic flat tappet cam and am considering a
new roller cam but am not sure whether to go hydraulic or solid. I've heard that solid lifter cams are
more maintenance but am unsure what that means. I'm considering a cam/intake upgrade. Again,
your patience and comments with me (engine/cam challenged!) are greatly appreciated. This is not
a daily driver and visits lots of cruise-ins and the strip 4-5 times a year. Other relative info is in my
sig. Thanks for your help.
(Also posted in Engine Mods)
Racer
Joined: Apr 2001
Posts: 446
Likes: 62
From: Sugar Land Texas
Re: 454 ?s (Marks69BB)
FOR WHAT IT'S WORTH. YOU CAN GO TO http://www.mortec.com TO LOOK UP YOUR MOTOR NUMBERS. ACCORDING TO MORTEC, IT IS A BOWTIE BLOCK, WHICH DOES HAVE SIAMESED CYLINDERS. THIS IS GOOD FOR BLOCK STABILITY AND THE BLOCK CAN BETTER ACCEPT A LARGER BORE THAN A STANDARD 454 BLOCK. AS FOR THE CAM SELECTION, THAT'S MORE OR LESS YOUR PERSONAL CHOICE. I WOULD CALL A COUPLE OF CAM COMPANIES AND GET THEIR OPINIONS. THE HYDRAULIC SET UP IS VERY GOOD, EXPENSIVE TO DUPLICATE AND MOST AFTERMARKET MANUFACTURERS HAVE GRINDS FOR YOUR HYDRAULIC SET UP.
