mark21742

Don't forget too that with some port and mill work you can make real good power with 241's

OutrunNAScaR14

iTrader: (4)

Even if you port and polish the 317's and mill them some they aren't as good as 241's or 243's on a NA setup?

Fbodyjunkie06

iTrader: (10)

Takes a lot to mill that much off of a 317 when you can take .030-.045 off a 241 or 243 and get higher static compression than you can with nearly twice as much off the 317's. You run out of material to mill and personally I'd like as much material on my heads as possible for deck sealing.

mark21742

Personally I would prefer a smaller chamber combined with a very slightly fished piston to get the exact compression I'm shooting for.

Don't quote me on it, but I think once you mill as much as needed off the 317 heads to get Thursday compression up you lose the combustion chambers desired shape and start shrouding the valves

OutrunNAScaR14

iTrader: (4)

Dang. The reason I asked is bc a buddy of mine has a ported and polished set of 317 with .600 lift springs for $100. But I don't guess they will do my NA ls1 any good.

Fbodyjunkie06

iTrader: (10)

That is a good deal!

If you were boosted or building it for boost they would be IDEAL, but in this case it's just not going to be optimal or even mediocre at best.

OutrunNAScaR14

iTrader: (4)

Thanks for the info. I thought about buying them just to resale since its such a good deal.

Sales4@Texas-Speed

iTrader: (4)

That's not a bad idea. Buy them and sell them or try to trade them for some 243s. that is a smoking deal for a set of ported 317s.

CuekooZ28

i found some 243's from a truck yard off of a chevy tahoe. Price is 175$. i plan on having them ported and polished to get some more flow out of them.

CuekooZ28

im in california, do you have a cam that will still pass smog plus make good power? i heard that a 224/224 581/581 114lsa is the max i could go and still pass smog

Sales4@Texas-Speed

iTrader: (4)

That is the largest cam we have been told by our customers will pass smog in Cali. I would be nervous about going much bigger.

OutrunNAScaR14

iTrader: (4)

The ls1 in my car came from Texas speed. So far it's hasn't missed a lick it runs strong.

Fbodyjunkie06

iTrader: (10)

Sent you a PM.

CuekooZ28

what cam are you running?

omc8

iTrader: (7)

317s are the most underrated heads in LS family . These heads in the hands of of top shelf porter can turn out some great numbers. If your is goal is peak compression go with 243 , but on a budget 317s milled .030 to .040 and hand ported will do the job. The comparison should be milled 317s vs stock 243s .

OutrunNAScaR14

iTrader: (4)

.592 .590 lsa113

JoshuaGrooms83

iTrader: (2)

from what ive been reading around the forum, thats almost if not exactly the same spec as the TU1 lol which is suppose to be a really good off shelf turbo cam lol im looking intot that one for my build lol
aare you running with just heads and cam or do you too have boost? if not hows it pulling compared to stock layout?

spec_j

iTrader: (3)

Im going to bring this back... so what I gather is that if im going power adder later then the 317 heads are worth it with the right cam...?

PREDATOR-Z

And that tells me??? What about durations?/