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Old 05-05-2013, 10:17 PM
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oldsmobile 403 help

im looking at a 70 trans am its a automatic so i know it not a 400 poncho but i havent popped the hood yet but im willing to say it a 403 olds


i wanna get like 300 ponies out of it or more if possible

what do i need to do first im on a fairly tight budget so the heads and stuff will have to wait for awhile


what can be done to a 403 to wake it up as best as possible before i get 350 olds heads 5,6,7 7as?

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Old 05-05-2013, 10:21 PM
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can someone give me a idea what this list of parts would cost for a 403

decent olds 350 heads
dual exhaust
headers
carb
intake
and i heard i need to machine the block and some stuff to make the heads fit
and a decent oil pump ?


can it be done for under 2500 or should i look for a poncho?

no chevys allowed
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Old 05-05-2013, 11:25 PM
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403 responds well to bolt on speed equipment.Make the exhaust a full 3 inch dual with x/H
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Old 05-06-2013, 10:10 AM
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i wanna do like 2 1/2 to 3 inches back to the 2 dual tips
im trying to think of a way i can open up the shaker but retain the would be flap or should i just cut it

what else can be done before i hit the heads? heads i figure be the most expensive
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Old 05-06-2013, 11:49 AM
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No 1970 t/a came with the 403 or any olds engine for that matter. Typo maybe?
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Old 05-06-2013, 01:03 PM
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The 350 heads bolt on. If you get the early small chamber heads (numbers 4, 5, 6, or 7) you need to open the bolt holes in the heads from 7/16" to 1/2", which is the head bolt size on the 403. You should also install the W-31-sized valves in the heads (2.000/1.625). The Performer RPM is a good intake choice, but I don't know if it will work with your shaker scoop. You didn't mention a cam swap, but this will likely be your best bang for the buck.
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Old 05-07-2013, 10:12 AM
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79 i meant but whats a set of heads cost? i know to make any real good power i need heads but problem is where to get them and how much it cost on average to heave the heads done and block fitted to them.

is 300 feasible without heads or will i def. need heads for that much
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Old 05-07-2013, 12:45 PM
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403 can easily make more than 300 HP without changing the heads. I echo the question, though, what is an Olds doing in a '70 T/A? A handful of late '76s and '77-'79 got 403 in the "emmissions" cars. All the others were Pontiac powered until '80. I MAY have seen a '79 with a 305, can't recall for sure.

One of my customers just picked up a "numbers" '70 and he's real excited about it. Ram Air III and a 4-speed.... The auto-trans cars had 400s (RA III and IV), too. The trans would be an M-40 (TH400).

Is there an oil "spout" in the front sticking straight up? Or do you pour the oil into the valve cover?

Jim
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Old 05-07-2013, 01:47 PM
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Quote:
Originally Posted by Mr. P-Body View Post
I echo the question, though, what is an Olds doing in a '70 T/A? A handful of late '76s and '77-'79 got 403 in the "emmissions" cars. All the others were Pontiac powered until '80. I MAY have seen a '79 with a 305, can't recall for sure.

Is there an oil "spout" in the front sticking straight up? Or do you pour the oil into the valve cover?

Jim
He corrected his mis type in the last post. Said it should hav been '79.
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Old 05-07-2013, 04:53 PM
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Quote:
Originally Posted by strokermax View Post
79 i meant but whats a set of heads cost? i know to make any real good power i need heads but problem is where to get them and how much it cost on average to heave the heads done and block fitted to them.

is 300 feasible without heads or will i def. need heads for that much
The reason why folks change heads on the 403 is that it's an easy way to raise the compression. Early small block Olds heads are easy to find on ebay or in the classifieds sections of Olds-specific online forums. Cores run $100-$150 a pair.

It sounds like you want bolt-on parts, but if you want to do a little work to that 403, get some aftermarket aluminum Olds heads like the ProComps prepped by Bernard Mondello (yes, Joe's son). Unfortunately these castings are designed for the big block Olds and have chambers around 72cc (vs about 64cc for the small block Olds iron heads). The valves and ports are larger and the only small block Olds intake with enough meat to port match the big block heads is the Performer RPM.

Keep in mind that these heads work great on a big block Olds 400 and should work even better on the large bore, short stroke small block 403. Unfortunately you really want new pistons to get the CR back where it needs to be.
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Old 05-08-2013, 08:32 AM
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Sorry, I missed the '79 thing. Same "rule" applies. Filler "spout" = Olds, valve cover oil fill = Pontiac.

Milling .030" off the heads, adding a Comp XE268H cam, Comp roller-tipped rockers (nice kit, comes with stiuds, guideplates, rockers and pushrods), Performer, and a decent pair of headers will wake it right up. No trouble "roasting" tires after this simple mod.

Jim
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Old 05-10-2013, 04:32 PM
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