Compression Ratio with 317 heads on a LS1?
TECH Fanatic
Joined: May 2016
Posts: 1,292
Likes: 436
From: St. Louis
That being said there is a big thread on here by cammotion that you should read through with all the cam testing. It's really funny to me some of the tests because when they start testing the rectangular port stuff versus the cathedral port on the ly6 short block with the valve relief Pistons The compression ratio goes in the toilet, however with the same big cam the bigger port heads still Make the most top end power despite the crappy compression difference and the losses on the low end versus the 243 or the 706 simply because the engine is just not trapping enough air at low speed but the trade-off in that test then is the ability of the engine to flow air at high speed So what I'm actually wondering is on an engine dyno is it possible that the 317s could out horsepower the 241s on a 5.7L short block If you revved it high enough to take advantage of the larger intake ports despite the lower compression and possible turbulence incurred by the larger chamber? That's the only benefit I could see if one at all? Then again this website has pretty much gone in the toilet as far as actual tech goes and I'm just rambling here while everyone regurgitates the same crap so whatever. I'm also named Steve and I have two A4 Camaros so there buddy.
TECH Enthusiast
Joined: Sep 2019
Posts: 532
Likes: 630
Im doing a stroker kit and I'm looking at 317s with 72CC chambers it'll give me 10.8:1 on a final 392 stroker with a 4.100 crank and punching the bore out to a 3.905. I talked to the guys at AI, they did my 243s back in the day and they said that port and polished 317s will out flow a set of port and polished 241s.
Back in the day (99 to 01), some folks would put a 4.1 crank in a LS1/LS6 block with varying degrees of success based on the builder.
Depending on piston etc some ran for a while and some burned oil at alarming rates etc.
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Verdad Gallardo Im doing a stroker kit and I'm looking at 317s with 72CC chambers it'll give me 10.8:1 on a final 392 stroker with a 4.100 crank and punching the bore out to a 3.905. I talked to the guys at AI, they did my 243s back in the day and they said that port and polished 317s will out flow a set of port and polished 241s.