Are they a replacement for the LT1 lifters? Does any maching have to be done to put LS7 lifters in the LT1 heads?

 

no machining but it would be a good idea to check your pushrod length

 

I have a bad comp r lifter. I also have some new LS7 lifters to replace the comp r lifters. I plan on measuring the depth of the pushrod cup to determine if there is a difference. I have seen the posts/arguing on here so maybe we can put this to rest with an answer.

 

sounds good

 

that would be great i would love to know for sure, like i have said in the past i did not measure the difference but i can tell you they visually "look" different in the cup area, otherwise they are exactly the same. i usually just tell people to measure just to be sure although i believe the difference, if any, will not be large enough to require a difference in pushrod length

 

I have a set on ebay for sale it you are looking

 

LS7 lifters?? Aren't these the ones that let the new Vette rev to 7200-7500 or something like that?? I'll give you a hundred for them.

 

meaning?

 

new from the dealer they cost 100, do your homework before you buy,

 

I have a ton of lifters. Most all of the made. Maybe later I will measure a few.

i CAN tell you that early LS1s used LT1 lifter and then they changed and the cup IS in fact different.

I will check later

 

120 from summit ant 100-130 at dealer depends were you are.....and yes they are diff in the cup size

 

can your current springs handle the extra lift?

 

extra lift from what?