craigcounty

Hey guys I'm new here on this forum. I am wanting to see if anyone else is using this size of valve on a 5.7 .I am trying to get an idea of what type of lift and duration I will be able to get away with using stock flattops without fly cutting .I have ordered a dial indicator and will check valve drop when it comes in .my heads are ported 853 casting milled .005 with ferrea 2.20 intake and 1.65 exhaust and my rockers are yella terra 1.80

3rdCoastPowerSports

iTrader: (5)

I wasn't aware you could run a 2.20 on stock seats. i thought max was 2.05

JS01

iTrader: (10)

You can't.

OP, I don't believe I've ever heard of running 2.200/1.650 valve setup on a 3.900 bore. you may way to verify cylinder wall to intake valve clearance.

BuckaroooZ28

iTrader: (1)

I believe he means 2.02

3rdCoastPowerSports

iTrader: (5)

ahhhhh......

ABQ99TA

iTrader: (17)

I has to be this ^^^^

KCS

iTrader: (20)

2.02" is the max, that's the OD of the seat itself. Any larger and the valve will seat on aluminum.

You could probably fit a 2.20"/1.65" combination in the head, but I really don't think they would fit in a 3.90" bore.

bww3588

iTrader: (49)

I don't think it would even fit in the chamber. Look at the ls3 heads, they had to move the intake guide over to fit the 2.165 valve. So a 2.2 valve won't fit in an ls1 head without sitting on aluminum or the exhaust valve.

studderin

iTrader: (28)

post a pic
its not getting a seat cut on the stock seat, I want to see the valve(s) that tight.... you have 3.85 of valve to fit

JS01

iTrader: (10)

I put a 2-3/16" seat to run a 2.125 valve in a 5.3L head a while back. You have to lay over the some chamber at that size, on the 706 head at least.. Seat was about .100" from the plug hole at that size. I think a 2.200 could maybe be done with a smaller exh valve but it would be alot of work.

JS01

iTrader: (10)

Just now came to me to even check the numbers. 2.200 intake and 1.650 exh will not fit in a stock valve spacing head. There is .010" interference between the valves at 1.915 valve spacing. Doh.

3rdCoastPowerSports

iTrader: (5)

thank you for the correction

craigcounty

It is 2.20 and 1.65 not 2.02 .if someone can tell me how I will post pics .and they do fit very tight clearance between valves .not sure if the valve seats have been changed or not but if helps previous owner of the heads said trevin lindsey did all the work and they were on a 5.7

craigcounty

When I hit "choose file" in the attachment nothing happens
Im doing this from my phone. I don't have a home computer does that matter

studderin

iTrader: (28)

https://ls1tech.com/forums/texas-mem...n-lindsay.html

Maybe call and see, If trevin set these up he would know best

craigcounty

Does anyone know how I can contact him

craigcounty

Just to let yall know I took the heads to trevin on Saturday and they are 2.02 valves. I guess the guy I bought them from was misinformed.I would now like to know what the biggest cam people are running with 1.8 rockers and 2.02 intake valve again I have stock bottom and flattops

ScottyBG

Why would you want to use valves that large anyway? They will be so shrouded, in a chamber that size, smaller ones would probably flow more. This would like putting headers with 2.5" primaries on a 346. It would be so over kill it would actually hurt performance. Its only going to flow what the runner can carry, that big of a valve is just a waste, and a mechanical challenge.

craigcounty

Are you saying the 2.02's are too big aswell? Also the intake runners are very large on these heads I compared them to some cnc ported afr 215's and they are considerably larger unless the guy I got them from lied they are supposed to flow 319cfm at .500 lift which I know is very high .I don't know if you read my last post but the guy I bought them from misinformed me about the 2.20 it is 2.02

ausls1

2.02 will be good, im getting 2.02 and 1.57 on my 241 casting heads, mine are getting hand ported, costs a little more but the guy that's doing them has a good rep and i know guys that have had heads and mates heads done through him and been more than impressed with the performance, if you find the right place go for it, they will be able to get the best and advise you on the best choice with out shrouding the valves.

mine are going on a 383 setup so iv gone with extreme street/race porting on top, not costing me much more (trade deal and manager knows the owner very well), good luck with it all.