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YES, the 5A heads FROM A 307 can be installed on a 403. The307 heads are a BETERR choice than the 67 to 72 Olds 350 heads. The 307 heads have similar sized intake & exhaust ports to the stock 403 heads. The 307 heads have a much smaller combustions chamber at arounf 67cc. This alone will raise compression to around 9.5:1. The only down side is the 307 heads have much smaller valves. You really must get larger valves installed into the 307 heads. The stock 403 valves will fit with some machining (of course) and you'll have a high compression 403. Get some port work done while you are at it & a little polishing too. Buy a new intake & have it machine & port matched to the intake & a middle of the road Lunati cam. This will result in a 403 producing around 330 HP. I know it works because this is exactly what I did. Enjoy your Olds, Mark
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∙ 13y ago
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Does a 1978 Trans Am 403 V8 use the same engine parts as a 400 V8?
NO. 403 is an Oldsmobile engine 400 is Pontiac engine no it dows not i have a Pontiac 400. uses diff. parts not interchangeable.403 is Oldsmobile
Your 1985 Olds Tornado has a 307 engine can you upgrade to a 350?
Yes you can upgrade to a 350 but only if it is an Oldsmobile 350 and you will need to use small block olds toronado intake from a 307 so you will have hood clearance-you may need to enlarge ports in intake to match 350 head ports but probably not much. You can use your 307 heads on the 350 but I would put bigger valves in those heads before I used them with a 350 and porting would not hurt if you want much performance. The Olds 350 will have a lot more power stock than the 307
Will your Chevy 305 motor out of a 85 Z28 fit in a 1970 Oldsmobile Toronado?
why would you want to? The Chevy bolt patern from block to tranny is different-all olds, Buick, and Pontiac v8's should use same pattern but not Chevy so it will not work-besides the 305 was gutless anyway, a stock 307 olds would make more power. I would not use anything smaller than a 403 to pull a car that heavy and I would just stick to an olds 455 if you have one. If you decide to use a 403 make sure you do everything you can to keep engine cool if you want it to last.
What oil does your 2 liter 307 use?
307 buick engine? 10-30W.
Have a 1984 Chevy Caprice Classic with a 5.0 Liter LG4 engine. I think it could be a 307 because the timing says to set it at 20 degrees BTDC and the Hayes manual lists 20 deg. as the set for 85 307?
307 Chevrolet was phased out in 1973. There was 307 cubic inch Oldsmobile V8, but that motor was not offered in the Caprice. You have a 305 if it's a gas-burning V8. The only other engines offered for that year were the base V6 and the diesel-burning 350. this above answer is wrong. the caprice did indeed use a 307 in the 80s.
What oil for 307?
307 60000oil change what oil do i use peugeot want to sell me a £25 a liter
Can you use e85 in a 2004 Oldsmobile alreo with a v6?
no you cannot use it in 2004 Oldsmobile alero
What type of transmission does a 1984 Oldsmobile delta 88 brougham v8 307 have 3 speed or 4 speed overdrive and what type of oil should be used?
General Motors TH200 (M29) 3 Speed Automatic Transmission Use Dextron II ATF
Chevy 307 bored out to 350?
Well a 307 has a bore of 3.875 and a stroke of 3.25, so to build a 350 out of a 307 you would need to bore out the 307 .125 inch to a 4 inch bore, which in most cases can not be done, and you would have to put a 350 crank which has a stroke of 3.48 inches and use 350 pistons. But if you want more cubes and power out of your 307 you can bore it .03 over, have it decked .025 inches, and use a 350 crank with 400 rods and 307 pistons to make a ground pounding 333 stroker.
What are the answers for Lesson 6.6 practice A?
Lesson 6.6, For use with pages 398-403
How do you change bulb in ashtray on peugeot 307?
hand use pannithan
The trans ams built in the late 70's used two engine choices an Oldsmobile 403 and the Pontiac 400 it is your understanding that the only way to get the 400 Pontiac engine was to also get the 4 speed?
To get a 400 Pontiac Motor in 1979, you had to also get the 4 speed. Pontiac last manufactured 400 motors in 1978 but saved some from 1978 for use in the 1979 model. Those motors were used in the 1979 4 speed cars only. 1979 Automatics had the Oldsmobile 403. You could also get a turbo version too. All of which could come with auto trans. I worked on many of these at the Pontiac dealer.
