2 bolt or 4 bolt mains. pontiac 455 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-02-2010, 03:58 PM
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2 bolt or 4 bolt mains. pontiac 455

well the 455 i got has 2 bolt mains, but is drilled for the 4 bolts. the block is already line bored for the crank and is ready to be put in. is it worth it to spend the extra money (idk how much its going to cost) to have the 4 bolt mains?

its going to be a 10:1 motor pretty agressive cam.

Also is Crowler? (i think thats the name) are they good cams?

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Old 09-02-2010, 04:53 PM
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A large amount of Pontiac blocks are drilled for 4 bolt mains but only have 2 bolt caps. It wouldn't be something to worry about adding them unless you intend to make a high rpm engine out of this 455 (6000rpm and up). I'd worry about the stock rods looong before I'd worry about 2 bolt mains, very smart move to trash the factory (CAST ) rods and go aftermarket forged.

Crower (not Crowler) is a really good company, I have used them for years, one of the early forefather companies in the industry, been around a long time.
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Old 09-02-2010, 05:21 PM
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thanks! yea, the guy that sold me the engine threw in a brand new crower cam. And he has a set of forged rods that he only wants 100$ for. mabye ill pick em up.
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Old 09-02-2010, 05:31 PM
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If they are factory early-mid 60's forged rods...don't bother, they aren't much better than stock cast rods. If they are '73-74 Super duty rods... jump all over that.

Eagle makes a good Pontiac I-beam at a good price. also look at Pacific Racing.
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Old 09-02-2010, 06:23 PM
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Eric is correct about the '58 to '62 forged rods (commonly known as rubber rods). In my opinion, cast rods are stronger. I used a set once and one broke at 5800 rpm, and of the rest, three were bent. As far as four bolt vs two bolt mains, unless you are going all-out racing, two bolt will be fine. It would be advantagous to switch to studs instead of bolts, though.

Bill

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Old 09-02-2010, 06:43 PM
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thanks for the replys, also i need to order a HEI and was looking at this onehttp://cgi.ebay.com/ebaymotors/Pontiac-Hei-Distributor-Trans-Am-Firebird-8912-350-455-_W0QQcmdZViewItemQQhashZitem2c5708def7QQitemZ19043 8760183QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccesso ries
It says it fits 75 and up. My block is a 455 from 1970... i looked up the change over parts and they say all distributors fit from 55-79. aside 455 SD motors.
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Old 09-02-2010, 11:13 PM
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Quote:
Originally Posted by AndersonRacing44
i looked up the change over parts and they say all distributors fit from 55-79. aside 455 SD motors.
That is true, but some intake might interfere with the large body on the HEI distributor, but I don't know of any factory manifolds that would.

Bill
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Old 09-03-2010, 01:30 AM
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I was looking at my 350 pontiac with the stock distributor and coil and theres a good amount of room for the HEI to fit. so it should fit with the 455.
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