I have a chance to get a big block 455, really cheap. so i was wondering what all has to be done to convert the 87 T/A of mine into a Big Block, is it just the motor mounts or is there more?

 

There's alot more. Mounts, exhaust, transmission, trans crossmember, torque arm, cooling, fuel system, ...

If you must have a big block BBC's are the easiest. Even then there's still alot of prep work.

 

Big block 455 means nothing. Olds, Pontiac and Buick all produced a 455.

As stated above, putting a B-O-P 455 into a third gen isn't impossible but you'll have to fabricate everything to do it. The only easy big block swap is a BBC.

You'll also need to change your transmission. Chev bellhousing bolt pattern is different than B-O-P.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

Alright... Thanks... I guess i need to just keep looking for a small block chevy.. Real Cheap!

 

I could have sworn I read that Pontiac intended to put their engine in the 3rdgen firebird. It should fit.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship :
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

Tranny issue is easy, even if you wanna keep overdrive.......
Grand National tranny, just like the one in the TTA.

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86 T/A 5.0 A4 & 2.77 gear
15.62 @ 86 mph
93 Civic 1.6L
13.5 @ 100 mph

 

Will the BBC 454 bolt up to the 700 R-4? Will you have to fabricate the motor mounts?

 

1. Yes
2. No

Confucious say, Do a search for this topic and all information will come to you...