Replacing OHC6 with V8. Swap question.
 

I'm replacing the OHC6 in my '69 LeMans 4-speed with a 462. I've got the mighty mounts for the 400 block ('68), will the mount brackets on the frame be the same and bolt right up, or do I need V8 specific brackets? Anything else I need for the swap? I got the bellhousing already, is the clutch linkage all the same? Thanks! With any luck it'll go in next week. (Can't wait!)

Firebird needed the V8 Specific receiver mounts. I dunno about the LeMans

The Firebird with OHC-6 was offset about 1/2 inch to the passenger side. I would think the Tempest would also.

Clutch linkage is the same, the ball stud for the block is different between V8 and OHC-6.

Hope this helps

frame mounts are different between an OHC6 and a V8

the frame mounts on the ohc6 are different. looked into that when i had my 68 lemans. went out and found a set of V8 mounts, but sold the car before i made the swap. i'll look for them tomarrow and snap a couple pics. maybe a visual and/or some measurements will help. it's been a few years, but i'm thinking the ohc's were taller.

The six-cylinder mounts are wider. Also, the starter and fuel pump will be on the left side with the V-8, you will need to move the battery, cables, and fuel lines. The six cylinder throttle cable will probably also be too long. You will need V-8 coil springs on the front if you don't want to be scraping the ground. You will probably need a bigger radiator too.

might be interested in a mount swap, Pm me if interested.

My 4BBL OHC6 gets 18 mpg. It's in my '67 Firebird. I rebuilt it ten years ago. The 462 cu in. engine in my '77 LeMans Sport Coupe gets 8 mpg. Guess which one gets driven most? Wasn't always that way, but at $3.50 a gallon, the gas pains are getting unbearable. Just spent $70 bucks tonight to put 20 gallons into the LeMans. You can't, however, beat the almost 500 horses the V8 puts out!!