fastbird02

iTrader: (4)

so i just picked up a set of 317 heads. in good shape, but need a good cleaning. now i also picked up a cam specs : 228/230 .585"/.585" 112 lsa. i will also eventually have a 100 shot to add to the mix. should i have work done to them or sell them and pick up 243s or something else? My thought was since i already have these to just have them milled and p/p to get closer to the 243s (so i have read, i think). but as you can probably tell im kind of a noob at head machining and matching heads with a cam(or vise versa).

thanks everyone for all the help,
Bruce

Blk98Vert

iTrader: (2)

Having them milled and ported will cost less than buying 243s and having them ported. Head milling isnt that expensive. What did you pay for them.

PREDATOR-Z

317 runners are very similar to 243/799 (internally). Milling a bit is the cheapest way BUT then you have to watch for PTV clearance. 317 are 71cc and .006/.007 off for every cc you loose that much in PTV distance.
Another way of doing this is to find a good aluminum welder and filling the chamber to desired compression. Critical is GOOD welder. Then PTV remains constant while chamber gets smaller.
You'll need to mill chamber 6.5cc to get to 64.5 (243/799 size). That translates in .040 mill at least and that reduces your PTV distance by that much.
Measure PTV on your cam with stock 317 chambers and based on that you will be able to determine if removing .040 keeps you in the .080/.100 safe distance or not.

fastbird02

iTrader: (4)

could i just give a sponsor that machines heads the cam specs and ship them my heads? sounds like a job not for me lol.

fastbird02

iTrader: (4)

i payed $50. for them. lol

MPFD

iTrader: (5)

That's about all their worth...

PREDATOR-Z

You could sell them for much more in the forced induction section.

fastbird02

iTrader: (4)

even if i sold them, would i get enough to make it worth it? Rather than having them milled and p/p. It seems more cost effective to me to just send out the 317s...

garygnu

send them to AI .

fastbird02

iTrader: (4)

i am between AI and texas speed. any other good machine shops, hopefully in MA or RI... does Slowhawk do machine work? he is only 10 mins away...

A.R. Shale Targa

iTrader: (2)

Some shops charge 60-70 to surface heads to make them flat(.008-.010)mill
Many shops charge shop time after that since they can only mill .003-.005
per pass after that. Again you'ld have more PTV clearance if you sold those
317s for $100-$200 then secured some 243s for $300-$400 which would only
need a .008" to seal, rather than .040" to get compression back.

conan

iTrader: (5)

Keep the combustion chambers as big as possible, drop your compression and go Forced Induction

PREDATOR-Z

That is what I did 3 or 4 years ago when Bo White ported them. They ended up about 72cc when I measured. I kept stock valves.
Hand ported and pretty well done, they flowed very similar (average 297cfm intake with very little variance). Darn good for hand porting. The guy that bought my 05 C6 (procharged), ended up slapping 2 hair dryers on it and is still running them today.

01ssreda4

iTrader: (96)

I'd personally call some sponsors and go over your options with your intended goals. I chose AI and have been please so far.

Camaro99SS

iTrader: (4)

Send them to AI (advanced induction). The ports are the same as the LS6/243 heads and AI will weld some metal in to them to reshape the chamber that will be as good or better than LS6's. They do the same to regular 241/LS1 heads with the "High Compression" option, and I got great results. No problems at all running on today's crap gas with 11.5:1 and a mild cam.

Jason

PREDATOR-Z

Bingo..

Advanced Induction

iTrader: (2)

Thanks for the kind words.

We do convert them to the 243 style chamber for +$200, and are then able to apply the 243/799 CNC work.

Bruce Pittman

iTrader: (2)

this is good to know since i got a set sitting around & was wondering what to do with them as well...