2.02/1.60's on an LT1..do they work?
01-19-2004, 03:52 PM
#16
Registered User
Join Date: May 2003
Location: Washington, PA
Posts: 503
A TRUE machine shop will tell you NOT to use 2.02"/1.60" in LT1 heads with stock seats. They do NOT fit correctly and close on the very top of the valve. Will it work?? Probably, but not by much. Is it working correctly and a proper fit?? NO! Will you see a gain over anything that will fit correctly (ie 2.00/1.56 at the MAX)? No! So why the hell bother.
Now, if you either cut out/and install new seats(costs bucks and is hard to do even for good shops), or Roll the seat edges out...but all that does is screw up flow, but allow the valves to appear to fit. I would just go with good stock size, backcut vavles...or 2.00/1.56. Anything else is overkill.
BTW...many of the guys that every one respects in the head porting world on this board have done lots of flow test and have not seen gains with the oversized 2.02/1.60valves vs the 2.00/1.56. Hope it helps you keep from wasting your time.
I have a feeling im gonna get flamed by the oversized is better crowed now. Please dont, that was not the intention to start flame war. I was just putting out info that I have already come across/and answers to this problem that I have delt with on two sets of LT1 heads already.
Now, if you either cut out/and install new seats(costs bucks and is hard to do even for good shops), or Roll the seat edges out...but all that does is screw up flow, but allow the valves to appear to fit. I would just go with good stock size, backcut vavles...or 2.00/1.56. Anything else is overkill.
BTW...many of the guys that every one respects in the head porting world on this board have done lots of flow test and have not seen gains with the oversized 2.02/1.60valves vs the 2.00/1.56. Hope it helps you keep from wasting your time.
I have a feeling im gonna get flamed by the oversized is better crowed now. Please dont, that was not the intention to start flame war. I was just putting out info that I have already come across/and answers to this problem that I have delt with on two sets of LT1 heads already.
01-19-2004, 07:10 PM
#17
Registered User
Join Date: Aug 2002
Location: Red Oak Texas
Posts: 1,509
If you machine the stock seats as large as possible, a 2.00/1.57 valve will fit perfect and seal at the edge of the valve.
If you use a 2.02/1.60 valve, you are placing a larger valve in front of the same size hole and NOT helping anything but not hurting much either. Ther is NO advantage to a 2.02/1.60 valve over a 2.00/1.57 valve with stock seats.
The 2.02/1.60's will seal a lil farther on the back side of the valve and work fine. The 2.00/1.57's are a better fit.
The ONLY reason to use 2.02/1.60's will be the cost. They are alot more common and can be bought for less $$$ than the "LT1 specific" 2.00/1.57 valves. The 2.02/1.60's are an inexpensive way to put larger valves in the LT1 heads. The 2.00/1.57's are better though.
Lloyd Elliott
Nighttrain66
If you use a 2.02/1.60 valve, you are placing a larger valve in front of the same size hole and NOT helping anything but not hurting much either. Ther is NO advantage to a 2.02/1.60 valve over a 2.00/1.57 valve with stock seats.
The 2.02/1.60's will seal a lil farther on the back side of the valve and work fine. The 2.00/1.57's are a better fit.
The ONLY reason to use 2.02/1.60's will be the cost. They are alot more common and can be bought for less $$$ than the "LT1 specific" 2.00/1.57 valves. The 2.02/1.60's are an inexpensive way to put larger valves in the LT1 heads. The 2.00/1.57's are better though.
Lloyd Elliott
Nighttrain66
01-19-2004, 07:11 PM
#18
Registered User
Thread Starter
Join Date: Sep 2001
Location: Scott AFB, IL
Posts: 465
Originally posted by NightTrain66
The ONLY reason to use 2.02/1.60's will be the cost. They are alot more common and can be bought for less $$$ than the "LT1 specific" 2.00/1.57 valves. The 2.02/1.60's are an inexpensive way to put larger valves in the LT1 heads. The 2.00/1.57's are better though.
Lloyd Elliott
Nighttrain66
The ONLY reason to use 2.02/1.60's will be the cost. They are alot more common and can be bought for less $$$ than the "LT1 specific" 2.00/1.57 valves. The 2.02/1.60's are an inexpensive way to put larger valves in the LT1 heads. The 2.00/1.57's are better though.
Lloyd Elliott
Nighttrain66
01-20-2004, 12:51 PM
#19
Registered User
Join Date: Feb 2001
Location: Belleville, IL
Posts: 1,450
Originally posted by N2OpwrdTA
I have a feeling im gonna get flamed by the oversized is better crowed now. Please dont, that was not the intention to start flame war. I was just putting out info that I have already come across/and answers to this problem that I have delt with on two sets of LT1 heads already.
I have a feeling im gonna get flamed by the oversized is better crowed now. Please dont, that was not the intention to start flame war. I was just putting out info that I have already come across/and answers to this problem that I have delt with on two sets of LT1 heads already.
Thread
Thread Starter
Forum
Replies
Last Post
squarehead
General 1967-2002 F-Body Tech
7
01-15-2015 07:02 PM