You would need to buy the $600-$700 G-Body 455 headers. You would also need a kit that relocates your oil filter. You would also want a bigger rearend if your running the 7.5" cause that will only last about a week. I bought a 455 and was about to do this and changed my mind and sold the motor because 455 eagle rods are about $600 and the parts are all very expensive.
455 Gbody
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markfothebeast said:
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No special headers or filter relocator thingies required! Just out of curiosity where did you get this info from?! I will be able to find out more details on how to do this right in about a week.... Ditto on the BBC swap. I think the only thing needed there was a set of '71-ish Chevelle manifolds, but I could be wrongo.
Sorry but I keep seeing everyone saying you've got to cut this up and get headers and make all sorts of wild-*ss blue-wrench modifcations to get a big block in there (Olds Chevy or otherwise), and it just ain't so.
But probably yeah on the rear. If you're going to be punching it and doing burnouts a lot (or racing), otherwise you'll probably be OK.
The key thing to note about Olds motors is that the big block (400, 425, and 455) are externally identical to the small block (260, 307, 330, 350, 403) except for the taller deck height. The starter, oil filter, and motor mount holes are all in exactly the same place. If the oil filter fit the G-body on the 307, it will fit with the 455. The taller deck DOES reduce clearance from the valve covers to the A/C box and the master cylinder, but it still fits. The carb and air cleaner will also sit about an inch higher due to the deck height differences. If you use a high-rise intake that increase will be even greater. If hood clearance is an issue, get a late-60s Olds Toronado intake manifold. These have a depressed carb pad for hood clearance on the Toro (the FWD required the engine to be shoved forward and a little higher than in the other full size Olds cars.
I put an Olds 455 in my car and everything fit awesome. The only exception being I had to make a notch in my non a/c heater box to clear the tall valve covers.
I just found a Rocket 455 for pretty cheap.
Would there be a HUGE difference in gas consumption? I plan on keeping my 200-4R and 2.52 gears (for now).
I was thinking about a 327, but this 455 is fairly cheap, and runs excellent. What a tough decision.
Would there be a HUGE difference in gas consumption? I plan on keeping my 200-4R and 2.52 gears (for now).
I was thinking about a 327, but this 455 is fairly cheap, and runs excellent. What a tough decision.
I'm looking to swap a 455 buick into my 1980 Pontiac Grand LeMans. it currently has a 305 SBC and i'm guessing that it won't just fit on the mounts like the 307 would. does anyone know what parts i'd need to put the 455 in or where i could get them.
o3 Milk, you need to start your own thread.
Pilot, There does not have to be a hugh difference in mileage. See my signature. The 200-4R can live with a good shift kit such as the one from CKPerformance and a large cheap transmission cooler. But those gears would have to go. To me the no brainer is to grab the 455. To make the little 327 go (its all relative) you have to cam it hard spin it hard use a bigger stall converter and numerically bigger gears. Now gas mileage & reliability just went to crap and maybe pump gas. Or you can keep the 327 stockish and slow but reliable car that get better mileage. Keep the 327 for a lightweight drag car build.
Oldspower & ROP also have lots of guys running 455s in there g-bod. www.robertpowersmotorsports.com is a good site also. A bit dated but well documented with pics and the honesty of first timer 455 to g-body mistakes. Cool car low 12s pump gas real street car with about 15mpg before being stolen.
Pilot, There does not have to be a hugh difference in mileage. See my signature. The 200-4R can live with a good shift kit such as the one from CKPerformance and a large cheap transmission cooler. But those gears would have to go. To me the no brainer is to grab the 455. To make the little 327 go (its all relative) you have to cam it hard spin it hard use a bigger stall converter and numerically bigger gears. Now gas mileage & reliability just went to crap and maybe pump gas. Or you can keep the 327 stockish and slow but reliable car that get better mileage. Keep the 327 for a lightweight drag car build.
Oldspower & ROP also have lots of guys running 455s in there g-bod. www.robertpowersmotorsports.com is a good site also. A bit dated but well documented with pics and the honesty of first timer 455 to g-body mistakes. Cool car low 12s pump gas real street car with about 15mpg before being stolen.
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