LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

2.02/1.60's on an LT1..do they work?

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Old 01-19-2004 | 03:52 PM
  #16  
N2OpwrdTA's Avatar
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Joined: May 2003
Posts: 503
From: Washington, PA
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.
Old 01-19-2004 | 07:10 PM
  #17  
NightTrain66's Avatar
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Joined: Aug 2002
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From: Red Oak Texas
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
Old 01-19-2004 | 07:11 PM
  #18  
BamaZ28's Avatar
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Joined: Sep 2001
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From: Scott AFB, IL
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
Amen Brotha
Old 01-20-2004 | 12:51 PM
  #19  
mongse_1's Avatar
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Joined: Feb 2001
Posts: 1,450
From: Belleville, IL
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.
No flames, good information though. I knew the 2.02/1.60s were the on the fringe, but didn't know there was no additional gains from a 2.00/1.56. Makes sense once you consider the throat diameter, valve seat diameter, etc.
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