Rally 350 engine specs??
March 25th, 2018, 01:26 PM
#1
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Rally 350 engine specs??
Looking at buying a 75 Omega for my son.
My son is turning 16 this year and am thinking would be a perfect car for him for his birthday.
Car is in awesome shape but have stuck a 305 Chubby engine in it. So I have a spare 76 olds 350 i can rebuild and put it in. But like any father would do, more power!!!Lol
Looking to build the engine to specs of the 350 rally.
Numbers be awesome
Thanks guys
My son is turning 16 this year and am thinking would be a perfect car for him for his birthday.
Car is in awesome shape but have stuck a 305 Chubby engine in it. So I have a spare 76 olds 350 i can rebuild and put it in. But like any father would do, more power!!!Lol
Looking to build the engine to specs of the 350 rally.
Numbers be awesome
Thanks guys
March 25th, 2018, 02:44 PM
#2
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A Rallye 350 engine is just a 4 bbl 310 HP engine. Nothing special. I would just build it with 10:1 compression with good pistons and a roller cam that cutlassefi would recommend for your goals...
March 25th, 2018, 06:37 PM
#3
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Go for more like 9 to 1 compression, so he can run 87 octane. I run 9 to 1 with a 214/214 custom cam from Cutlassefi. I would get a converter as well, the Jeggs 2000 to 2300 stall has good reviews and is cheap. I went from a 2300 flash stall in my 2004R to the stock stall in a TH350C. It went from a tire burner to it won't even spin the tires. Of course the 2.78 gears don't help, your Omega will have similar gearing.
March 26th, 2018, 07:17 AM
#4
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March 26th, 2018, 11:39 AM
#5
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Go for more like 9 to 1 compression, so he can run 87 octane. I run 9 to 1 with a 214/214 custom cam from Cutlassefi. I would get a converter as well, the Jeggs 2000 to 2300 stall has good reviews and is cheap. I went from a 2300 flash stall in my 2004R to the stock stall in a TH350C. It went from a tire burner to it won't even spin the tires. Of course the 2.78 gears don't help, your Omega will have similar gearing.
Why run 87 Octane? All 87 & 89 Octane fuels in Alberta & BC contain Ethanol. Why not build an engine to run on Ethanol free 91 or the 93/94 Octane Ethanol fuel that is available at most pumps? I know those fuel cost more... I am looking for other reasons. Compression makes power. I have no issues running my iron head engines with true 10:1 on the pump 93/94 or my Aluminum headed 11.2:1 engines on the same.
Last edited by oldsmobiledave; March 26th, 2018 at 11:41 AM.
March 26th, 2018, 04:40 PM
#6
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Why run 87 Octane? All 87 & 89 Octane fuels in Alberta & BC contain Ethanol. Why not build an engine to run on Ethanol free 91 or the 93/94 Octane Ethanol fuel that is available at most pumps? I know those fuel cost more... I am looking for other reasons. Compression makes power. I have no issues running my iron head engines with true 10:1 on the pump 93/94 or my Aluminum headed 11.2:1 engines on the same.
March 26th, 2018, 06:15 PM
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March 26th, 2018, 06:18 PM
#9
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Go for more like 9 to 1 compression, so he can run 87 octane. I run 9 to 1 with a 214/214 custom cam from Cutlassefi. I would get a converter as well, the Jeggs 2000 to 2300 stall has good reviews and is cheap. I went from a 2300 flash stall in my 2004R to the stock stall in a TH350C. It went from a tire burner to it won't even spin the tires. Of course the 2.78 gears don't help, your Omega will have similar gearing.
Not what was done to fit a 305 Chubby in it tho.
Gears I would change out, mid 3 I think.
Cause of course dad needs to drive it too. Lol
March 26th, 2018, 06:21 PM
#10
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All 70 350's had 6 heads and all the 4 bbl 70 350 engines had the same cam other than the W-31. All 4bbl engines even had the same distributor including the W-31. You will be best off by going to a more modern cam for the same money.
March 26th, 2018, 06:22 PM
#11
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Why run 87 Octane? All 87 & 89 Octane fuels in Alberta & BC contain Ethanol. Why not build an engine to run on Ethanol free 91 or the 93/94 Octane Ethanol fuel that is available at most pumps? I know those fuel cost more... I am looking for other reasons. Compression makes power. I have no issues running my iron head engines with true 10:1 on the pump 93/94 or my Aluminum headed 11.2:1 engines on the same.
maybe flat tops in it.
Going to use iron heads on it. I have a set of 7s but also found a 1970 350 with 6 heads.
More compression, better burn.
March 26th, 2018, 06:24 PM
#12
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Yes was just looking for a comparable cam to the rally 350
March 26th, 2018, 06:27 PM
#13
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I only run 91 octane, same rule here as well, premium is non ethanol. My next motor will be 9.6 to 1, I wouldn't push 10 to 1 with 91. There is no 93/94 locally that I know of. But this is for a 16 year old kid and some states have ethanol across the board and he may not look or care what goes in the car.
So maybe tune down mid 9's then
March 26th, 2018, 06:30 PM
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March 27th, 2018, 05:51 AM
#19
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Nice Omega. I leaned on the carb on my 70 on purpose so my daughter and her boyfriend wouldn't have as much fun with my 70S. I would go mid 9's with 91, you definitely want a better cam than the under 200 duration .400/.402 stock cam that came in the automatic Ralleye 350's. The standard trans cam was better but still not radical something like 210/210 .472/.472 I believe. Get the new Mahle 10cc dish pistons that Cutlassefi brought to the market, it will give you low to mid 9's for compression and get a cam from him as well.
March 27th, 2018, 12:39 PM
#20
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As stated above, that is a pathetic cam for performance.
.400"/.400" lift, 186º/202º duration @ .050" lift, 250º/264º advertised duration
Get a generic "RV" cam and it will be much better than the factory 350-4bbl cam.
.400"/.400" lift, 186º/202º duration @ .050" lift, 250º/264º advertised duration
Get a generic "RV" cam and it will be much better than the factory 350-4bbl cam.
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