pump gas compression
#1
pump gas compression
im getting a 350 that is 9.5:1 compression. im replacing the cylinder heads with the vortec style heads. my problem is that the way the vortec combustion chambers are designe, they raise compression. does anyone know ho much they raise the compression. and what is the highest compression i can run on pump gas 91 octane, this is goin to be my daily driver. thanks
#2
RE: pump gas compression
Although they may raise the compression, these are fast burn heads and can tolerate higher compression than standard heads. With proper tuning you should be able to handle 10.5:1 on premium fuel.
#4
RE: pump gas compression
thanks, when i have the engine running and in the car, where should i take to get it tuned, a performance shop, or will anyplace be able to do it for me
#5
RE: pump gas compression
I think you could probibly run it on 89 or possibly 87. I had a 396/350hp and it ran fine on 87 octane with 10:25:1 compression. Now i'm building a 350 with 10:25:1 or 10:50:1 compression and it to will be a daily driver.
#7
RE: pump gas compression
What heads are on it now, if they are the stock 76cc heads and you have 9:5:1 you will run abit above 10.5:1 with the 64cc vortecs. As Pete said they are less prone to detonation due to the design(spark plug location) the bad thing is they need a different intake. As far as compression/detonation goes I think the biggest influence really dependsless onstatic compression and more on dynamic compression ratio which is controlled by camshaft selection, which might be a reason some can get away with higher static compression than others. Aluminum heads would also help that.
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