stg II heads on a 383?
This is a discussion on stg II heads on a 383? within the Internal Engine forums, part of the LSx Technical Help Section category; i got a set of NEW patriot performance stage II ls6 heads with 2.055/1.57 valves and 59cc combustion chambers for ...
02-23-2006, 04:28 PM #1
stg II heads on a 383?
i got a set of NEW patriot performance stage II ls6 heads with 2.055/1.57 valves and 59cc combustion chambers for $900 on ebay. i cant decide on a forged 347 short block or a 383 after my warranty expires. would these heads flow enough for a 383 even with a ported ls6 intake and 80mm bbk t/b? i think a 347 would be just as good but who could resist a stoker?
if i get a 347 i was going to use this cam from vinci high performance with thier accelerated lift rockers:
DUR @ .004" 284* / 290*
DUR @ .050" 222* / 228*
LIFT .551 / .551
02-23-2006, 05:02 PM #2
that's a pretty hefty intake valve for a stock bore 346 motor. more than likey run into valve shrouding due to cylinder bore interference. IMO, they will flow just fine on a 383 motor provided you do it with a larger bore. like the 6.0L block with the 4.00" bore or the LS2 motor.
nice choice on cam btw.
02-23-2006, 05:03 PM #3
- Join Date
- Aug 2005
- Texas Department of Corrections
- Retired Outlaw Sum Bitch
Yup...those are the heads I had on my LS1...hell they flow at over 300cfm @ .600 lift....290ish @ .500....great heads.....they would love that 383
02-23-2006, 06:05 PM #4Originally Posted by mrr23
so i better change the valves to 2.02? or get a 383 ls2 short block???
02-27-2006, 09:22 AM #5adudeGuest
Those heads flow like a banshee. IMO you would almost be wasting them on a 346 due to their flow capacity and the valve shrouding issue as mrr23 pointed out. IMO again you need more cubes mainly from bore (helps unshroud I valve) or more rpm so you are moving more F/A mixture, the later still leaves you with the valve shrouding issue and way more strain on internals. Bore and Stroke for me. By the way it's pretty hard to put a smaller valve in a head that is machined for a big valve (2.02 in a 2.055 seat).
02-27-2006, 10:40 AM #6
i asked nick agnostino at Agostino-Racing engines about the valve shrouding issue and he said: "we use 2.055 intake valves all the time on
the factory bore and they work great. I do not
recomend going any bigger (2.08) as we have tried it
and there are no power gains; actually some small
losses. So in short the heads you have will work great
on the 383 short block."
"Here is quotation on one of our 383's:
Eagle 4.00 stroke crank
Eagle 6.125 rods
Wiseco light weight pistons
FM race series bearings
Childs & Albert file fit ring set
New LS6 block with cam bearings installed
Block square decked, line honed, honed with torque
plates and clearenced for stroker crank
Assembly fully balanced
Engine fully assembled with build sheet attatched
OUTRIGHT PRICE (no core charge required):
$ 3,850.00 usd plus shipping
$ 150.00 Add main studs
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By Fubarredz in forum Parts For Sale / TradeReplies: 2Last Post: 05-25-2006, 12:09 PM
By 95TA383 in forum Internal EngineReplies: 0Last Post: 02-09-2006, 11:09 AM
By onefastss223 in forum Parts For Sale / TradeReplies: 16Last Post: 12-23-2005, 07:01 AM
By Blksilvr in forum Parts For Sale / TradeReplies: 2Last Post: 09-20-2005, 06:36 PM
By Fubarredz in forum Texas MembersReplies: 1Last Post: 09-02-2005, 08:07 PM