Forced Induction - 317 vs 243's for a 5.3L TC78 setup
09-25-2011, 08:50 PM
I'm building a 5.3L TC78 turbo nissan 240sx. I have a 216/221 .580/.580 cam and I would like to throw some take off heads on it. I will be running E85 all the time so I don't want the compression to low to help the little 5.3L spool.
I was thinking about buying some 317's and having them milled down to 64-66cc.
What would the CR be for a stock 5.3L and 243's compared to 317's?
Any suggestions on budget take off heads for my setup will be appreciated.
09-25-2011, 08:54 PM
I had a similar quandry awhile back, the concensus was that it would be a dog out of boost and unnecessary with e85.
09-26-2011, 12:41 AM
Just go with the 243s, no point in milling 317s and reducing head deck thickness on a boosted LS , just gonna make it easier to push water.
09-26-2011, 02:22 AM
I agree with johnv i just ordered arp head bolts so i can swap out to a set of 243's i have laying around. I believe the comp will end up around 9.1to1 or somewhere there abouts correct me if im wrong.
09-27-2011, 12:11 AM
Thanks, so the 317's are out. It's either buy some take off 243's or keep the 5.3"s for now.
I have some 241's but I'm not sure what cc they are and if they would be any better than the stock 5.3's for my application. I want to keep it around 9.0-9.5 CR with E85 and a TC78.
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