BIG motors in a Contemporary

Mdman352 · #1 (**permalink**) 12-12-2011, 11:31 AM

Can someone fill me in on the issues of putting a 460 based motor in the Contemporary? I am debating using the Kasse Boss 600. That failing the 520 P-51 motor. Any actual information would be greatly appreciated.

cobrarkc · #2 (**permalink**) 12-12-2011, 12:21 PM

Isn't the Boss 600 is a larger aftermaket block for the bigger bore? Just fitting a stock sized Boss motor would be challenging. He makes a 521 Boss using a stock 460 size block that cranks out 800hp.

blykins · #3 (**permalink**) 12-12-2011, 02:13 PM

I've done the BBF stuff with the Boss 9 heads, etc. The aftermarket blocks needed to get to the 598-604 ci range are Ford Racing blocks with siamese bores and I don't think they are physically larger than a production block, but they pack a 4.500-4.600" bore size vs the 4.360" factory bore. With that being said, the heads could rain on your parade as they are huge. I think Jay with Vintage says that they fit in a Backdraft, but I haven't heard anyone say anything about a Contemporary.

The P51 heads will make as much power as the Boss 9 heads at a tremendously lower cost. The Boss 9 heads aren't expensive by themselves, but it's the $1500 rocker arms, $600 valve covers, etc, etc. that starts running the price up. You can also use them on a Ford Racing block for big cubic inches and big horsepower. I personally wouldn't stop at the 4.300" stroke, but would go with the 4.500" stroke.

Here's a 529ci Boss 9 that I did recently...going in a '70 Mustang, so the cubic inch displacement was a little more important.

B2 Motorsports 529ci Engine Build - Muscle Builder - Modified Mustangs & Fords Magazine

740hp @ 6000 rpm with an extremely mild camshaft...

B2 Motorsports LLC

mickmate · #4 (**permalink**) 12-12-2011, 03:47 PM

Hey David the CCX manual says 289-428 Ford and small to BB Chev. I don't know which is the larger dimensionally.
I sent you this link to the FT powered HiTech, the FT's are also common in Everett Morrisons. I think you could shoehorn that in there.
Replica/Kit Makes Replica/Kit Makes | eBay
Your footboxes may be a little tighter to the exhaust than a CSX style frame but I think it will go.