Motor Mounts

[GRYGOSE]

What have you guys used for big block swaps. i bought the block portion from summit and when i got them in the mail i knew they were wrong. what have you all done. Truck is a 72 motor is a 402

[Shyguy]

Well, we used a set of stock big block mounts from a '73 C-20 to put a big block in my '71C-10.

[GRYGOSE]

OE is way off the charts in price. anyone have a aftermarket suggestion ?

[junkyardjohn]

I DON'T HAVE ANY IDEA ON YOUR BUDGET BUT YOU CAN MOST ALWAYS FIND A SET OF 72 ONLY BB STANDS FOR UNDER $200. THEN YOU CAN USE ANY BB CLAMSHELL TYPE MOUNTS UP TO AT LEAST 86. WITH THIS ECONOMY BEING IN THE SH!TTER LIKE IT IS, YOU CAN PROBABLY FIND EM FOR HALF THAT. INVEST $25 FOR A PAID SUBCRIPTION & THEN PUT A WTB ADD ON THE PARTS BOARD. WELL WORTH THE $ & IT'LL COME BACK TO YOU RIGHT AWAY. JOHN

[raycow]

Unless you are doing a stock resto, use the 73-up mounts. Their only downside is that you have to drill a couple of new holes in the frame. For the difference in price, it is time well spent.

Ray

[junkyardjohn]

IT'S A LITTLE MORE THAN THAT RAY. IVE DONE IT. HONEST. 73 UP BB TOWERS ARE ABOUT AN INCH TALLER THAN 72 BB MOUNTS WHEN OUT IN A PRE 72 TRUCK THAT HASN'T BEEN CONVERTED TO A 73 UP CROSSMEMBER ASSY. (THIS ISN'T SOMETHING I'VE HEARD, OR READ, OR HAD A FREIND THAT SAID IT WOULD WORK). (THIS IS FROM MY OWN PERSONAL EXPERIANCE) IF IT HAS BEEN (CROSSMEMBER CONVERSION) CONVERTED, IT'S A PRETTY SIMPLE BOLT ON AFFAIR. YOU CAN MAKE THEM WORK BUT IF YOU BOLT THE BOTTOM SIDE IN.. THE TOP WILL BE ABOUT AN INCH HIGHER THAN THE FRAME RAIL. YOU CAN OVERCOME THIS BY PUTTING A SPACER ON TOP OF THE FRAIMRAIL BETWEEN THE FRAME STAND. THEN YOU'RE BB SETS AN INCH TOO HIGH & THE GEOMETRY ISN'T CORRECT. OR YOU CAN HEAT & BEND THEM TO FIT, AGAIN RUINING THE GEOMETRY, MAKING BOLTING UP THE MOTOR A REAL PAIN. 73 UP CROSSMEMBERS ARE ABOUT AN INCH DEEPER THAN 67-72 CROSSMEMBERS & THE MM TOWERS REFLECT THAT. HONEST.. I HAVE SEVERAL SETS OF EACH STYLE OUT IN MY SHOP. IF WHAT YOU CLAIM WAS INDEED CORRECT.. DON'T YOU THINK EVERYONE WOULD BE USING THE ULTRA COMMON 13 YEAR PRODUCTION, $12 73 UP TOWERS INSTEAD OF SPENDING $150 OR $200 ON 72 ONLY BB TOWERS?? OR DO YOU FIGURE EVERYONE ELSE IS JUST PLAIN STUPID & YOU ARE THE ONLY ONE THAT EVER STUMBLED ON THIS LITTLE GEM OF KNOWLEDGE??? JOHN

[clos69]

Subscribed to this as I am also going BBC 454 from a 78 to my 67 but trying to decide if I should go with 68-71 or 72 towers.

[junkyardjohn]

Originally Posted by clos69

Subscribed to this as I am also going BBC 454 from a 78 to my 67 but trying to decide if I should go with 68-71 or 72 towers.

CARLOS... IF YOU'VE GOT ACCESS TO A 78 DONOR TRUCK, THE COMPLETE FRONT END CROSSMEMBER ASSEMBLY, ALL THE WAY TO THE STEERING GEARBOX IS PURTY NEAR A BOLT ON AFFAIR. & PARTS ARE PLENTIFUL & CHEAP. JOHN

[raycow]

Junkyard is right. I had previously done a crossmember swap on the truck as part of a disc brake conversion and didn't think about it being different.

Ray