Author Topic: 455 rebuild and parts advice  (Read 1448 times)

SLewis79

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455 rebuild and parts advice
« on: November 13, 2016, 01:27:00 PM »
Hello all,

I'm starting to get together a part list for everything I want for the T/A and am in need of some advice when it comes to the engine rebuild. I have a 455 that currently has the stock 4x-1h heads, a performer intake, and a 750 CFM holley carb. I am unsure what type of cam but I know it isn't stock, and I am pretty sure the block has not been bored. My overall goal for the car is to be a weekend cruiser and occasionally drive it to work and I highly doubt I'll ever take it to the strip. I mostly just want to enjoy the car and have fun. Also, I am on a limited budget and want to be able to use 91 octane since that is the best available in my area

What I am thinking so far is to upgrade the performer intake to an RPM and to use the matching cam and lifter kit from edelbrock.
https://www.summitracing.com/parts/edl-7156
https://www.summitracing.com/parts/edl-7157

As far as rockers and pushrods, would this be a good choice?
https://www.summitracing.com/parts/cca-rpm1451-16/overview/make/pontiac

I already have a set of 6x-8 heads that I would like to use also.

When it comes to valves and springs I have no clue what I should get. Suggestions?

For the carb would it be better to get the matching edelbrock carb for the RPM intake, keep the Holley, or get a q-jet?

Since I don't have any drag strip plans would I be able to keep the the stock crank, rods, and pistons? That would help out a lot with the overall budget of the car also.

If it makes any difference I plan on getting some hedman shorty headers and using a 2.5" exhaust from pypes. Also, the rear end is a 3.73 and for highway comfort I want to either change that to a 3.08 or swap my TH-400 for a 4L80E.

So, am I on the right track? Any and all suggestions are much appreciated! Thanks!
1979 Trans Am - 455

SLewis79

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Re: 455 rebuild and parts advice
« Reply #1 on: November 19, 2016, 06:45:54 PM »
Anyone?
1979 Trans Am - 455

nas t eh

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Re: 455 rebuild and parts advice
« Reply #2 on: November 19, 2016, 10:08:01 PM »
So I think you are asking about rebuilding a stock internal 455 that has unknown aftermarket cam, and you want to know what you can reuse?

Or are you not planning to rebuild the short block but use it as is and just add better the better heads, intake, carb and headers?

Clarify the above first, or answer what is your budget.
« Last Edit: November 19, 2016, 10:19:47 PM by nas t eh »
current
73 T/A 4speed
past birds
75 T/A 455 4speed
75 T/A 400 4speed

SLewis79

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Re: 455 rebuild and parts advice
« Reply #3 on: November 19, 2016, 10:27:49 PM »
I would like to use the short block as is. I know that's a gamble and once I get the heads off and check out the cylinders that may have to change.
Basically, I want to use the stock short block and add on the RPM intake/cam, the 6x heads, new lifters/pushrods/rockers, and some ram air manifolds. I think that new valves and springs would be a good idea also. I will also take the heads and intake to a machine shop to get them cleaned and matched.

If using the stock short block is a terrible idea please tell me so. The budget isn't a huge concern, if I need to spend more I will just have to spread it out and take it slow (possibly taking years).

Overall I'm just looking for a mildly upgraded 455, nothing crazy

Sorry for the vagueness of the post. This is the first real engine work I've done and I have a LOT to learn. Been reading and watching a ton of videos lately and referencing Jim Hands book

1979 Trans Am - 455

nas t eh

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Re: 455 rebuild and parts advice
« Reply #4 on: November 19, 2016, 10:50:12 PM »
Reusing the short block is usually unwise, but do you know how many miles are on it and how it run at this point? Putting rebuilt heads on a old short block almost always results in oil consumption past the rings because they loose the compression sealing battle to the new valves.

If the motor is running you could do a compression test, maybe a leak down test too. That combined with the knowledge it only had low miles and ran well would be a reason to consider bypassing rebuilding the bottom end.

current
73 T/A 4speed
past birds
75 T/A 455 4speed
75 T/A 400 4speed

Re: 455 rebuild and parts advice
« Reply #4 on: November 19, 2016, 10:50:12 PM »

SLewis79

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Re: 455 rebuild and parts advice
« Reply #5 on: November 19, 2016, 11:08:50 PM »
As far as the history and mileage of the motor it was rebuilt by a previous owner sometime in the mid-late 90s, was daily driven until 2004 and has basically sat since then with the occasional starting to move it short distances.

The motor is no longer running as I have already begun disassembly. Up until that point it ran quite well, the only problems I am aware of is that the exhaust had a strong gas smell and was slightly blue in color and there was a ticking on the drivers side of the engine which I thought was possibly a bad lifter, rocker arm, or head gasket leak. Now that I've removed the rockers and lifters, I saw no obvious signs of excessive wear on them and none of them had excessive play, which makes me hope that it was just a blown gasket that I can easily replace.

I wouldn't be opposed to keeping the 4X heads, I just figured that since I had the 6X already I might as well use them, but I can always save them for the next build.
1979 Trans Am - 455

nas t eh

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Re: 455 rebuild and parts advice
« Reply #6 on: November 20, 2016, 03:46:07 PM »
I don't think I would want to risk my time or money on that motor without a rebuild that included rings and bearing. That is the typical recipe for a full proper rebuild. There are a bunch of threads in here about what it takes and costs but you need to be thinking machine work to prepare the block, crank, rods and buying new pistons, rings and bearings.
current
73 T/A 4speed
past birds
75 T/A 455 4speed
75 T/A 400 4speed

SLewis79

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Re: 455 rebuild and parts advice
« Reply #7 on: November 20, 2016, 09:37:59 PM »
Thank you very much! I will look into rings and bearings and start looking for a machine shop. That gives me a good starting point
1979 Trans Am - 455

nas t eh

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Re: 455 rebuild and parts advice
« Reply #8 on: November 21, 2016, 02:58:17 AM »
Truthfully a good starting point would be to point you in the direction of a Pontiac engine builder in your area that will use what is salvageable from your motor. You won't want to buy pistons, rings and bearings till after the work is done on the block, crank and rods.

I think you are fairly close to Len Williams in Bristol Oklahoma, he is very reasonable and dedicated to Pontiacs. If you want to save money and get good work and advice, he would be my first call.
« Last Edit: November 21, 2016, 03:10:17 AM by nas t eh »
current
73 T/A 4speed
past birds
75 T/A 455 4speed
75 T/A 400 4speed

oldskool

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Re: 455 rebuild and parts advice
« Reply #9 on: November 21, 2016, 08:29:12 PM »
X2 on using Len Williams for your rebuild.

You can always have the 6x heads done, bolt 'em on the shortblock, & hope for the best. If the rings will hold their seal, you might be able to save the cost of a rebuild right now.

If it don't work, your only out the cost & labor of gaskets, installation, & start-up. If you find that the shortblock won't seal up with the added compression, at least you'll already have the heads done.


"...When it comes to valves and springs I have no clue what I should get. Suggestions?..."

Go with one piece stainless valves. Butler sells Ferrea SS valves. You don't really need 1.77 exhaust valves. But, since Ferrea don't make 'em in the 1.66 size, Butler cuts down some 1.77's to 1.66, & sells 'em for double price. To save a few bucks, you can go with SI brand 1.66 exhaust valves. The stock length valves for the 6x heads is just under 5".

http://butlerperformance.com/i-24453168-ferrea-high-performance-stainless-steel-intake-valve-setfer-f5065-8.html?ref=category:1234817

http://butlerperformance.com/i-24453159-ferrea-high-performance-stainless-steel-exhaust-valve-eachfer-f5062-1.html?ref=category:1234817

http://butlerperformance.com/i-24453161-ferrea-high-performance-stainless-steel-exhaust-valve-eachfer-f5062m166-1.html?ref=category:1234817

Looks like the SI 2.11 intakes are # 6006SG & the 1.66 exhausts are # 6001SG

http://sivalves.com/flipbook/2016-SI-Catalog.html#p=43

If you go with a small cam, you can use CC 988-16 springs. If you go with a bigger cam, such as a Ram Air 4 clone, most recommend the Crower 68404-16 springs.

https://www.amazon.com/Competition-Cams-988-16-Valve-Spring/dp/B000CEO7QC

http://www.jegs.com/i/Crower/258/68404-16/10002/-1?CAWELAID=1710547370&CAGPSPN=pla&CAAGID=15769068431&CATCI=aud-194671897271:pla-177199366631&catargetid=230006180003463839&cadevice=c&gclid=Cj0KEQiA08rBBRDUn4qproqwzYMBEiQAqpznszjdV9ts7a7xgaHPy53lDG7GUd-NsRSVYTzp8aJmV-0aAjQU8P8HAQ


SLewis79

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Re: 455 rebuild and parts advice
« Reply #10 on: November 22, 2016, 08:53:10 AM »
Thank you both for your input. I really appreciate it!
1979 Trans Am - 455

Re: 455 rebuild and parts advice
« Reply #10 on: November 22, 2016, 08:53:10 AM »
You can help support TAC!