1.90 Valves
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Joined: Sep 2009
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From: The Internet (& Dyer, Indiana)
I agree with thedonthere, the pistons are easy to relieve.
You have gone this far, do it right and be happy later.
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Outstanding HDF Member
Joined: May 2008
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From: la
I have the 37's, I think being happy later would be getting the bigger pistons now, it will save me the time and cost of gaskets later. I was tempted to leave it 96 for now and slap on a set of heads but after that settled in I would be looking for more cubes anyway. I do have an extra set of heads and jugs already so my down time would be minimal.
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From: san antonio
It's not so much the lift and you should be looking at TDC lift anyway, not total lift. It's the location of the valve reliefs which are deep enough but often not exactly where they should be. You are probably OK but measuring is always the best bet and it will give you a baseline for future cam changes as well. As Faast points out, cam base circle fits into these measurements as well. Just a little "kiss" and you have a bent valve.
If you are careful, you can expand the reliefs with the pistons in the jugs. It you increase displacement, you still have to deal with the valve reliefs if you are running 1.90" intakes unless you buy aftermarket pistons that have already been machined.
Have you considered keeping your stock valves? The larger valves are really not going to help much in the rpm range where most of us ride. For a run of the mill BB build, it's not worth the money IMHO. Having said that, even with stock valves, I would clay and measure.
If you are careful, you can expand the reliefs with the pistons in the jugs. It you increase displacement, you still have to deal with the valve reliefs if you are running 1.90" intakes unless you buy aftermarket pistons that have already been machined.
Have you considered keeping your stock valves? The larger valves are really not going to help much in the rpm range where most of us ride. For a run of the mill BB build, it's not worth the money IMHO. Having said that, even with stock valves, I would clay and measure.
Last edited by djl; Nov 22, 2009 at 11:12 AM.
Banned
Joined: Sep 2009
Posts: 7,580
Likes: 7
From: The Internet (& Dyer, Indiana)
I have the 37's, I think being happy later would be getting the bigger pistons now, it will save me the time and cost of gaskets later. I was tempted to leave it 96 for now and slap on a set of heads but after that settled in I would be looking for more cubes anyway. I do have an extra set of heads and jugs already so my down time would be minimal.
My original plan was for cams only,........
It's called "one more itis". LOL (No regrets).
.
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Outstanding HDF Member
Joined: May 2008
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From: la
My original plan was intake, exhaust and a tuner but we know how that goes, I wasn't really looking for larger valves but the heads in stock already have the 1.90's and I was thinking I could speed up the process with them. What I'm looking for is a bump in compression and mild port job, having mine done with stock valve sizes is starting to look good.
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a 96 ci motor is only 1 ci more then a 95 and for yrs we have made kits for th e95 in motors to scream.
with a little work to the pistons and a set of good heads and a cam these 96ci motors will rock remember they already have a longer stroke then the 88-95in motors.
to save time and money do a hot 96 with a stock pistons and lower end ,have those heads sent out (i prefer Baisley) have them bump the comp and do a nice cam with a good tune and you would be right along the lines onlty a few less then a 103 with money in your pocket.
now theres a reason i say this next yr most will want to do another build so why nott wait till next yur and do a bigger 117,120 or 124.
doing a hot 96 now and doing a good bigger cubic motor makes sense financially also.
if you have a great set of heads you dont even have to send them out to be ported just freshened up.
l
with a little work to the pistons and a set of good heads and a cam these 96ci motors will rock remember they already have a longer stroke then the 88-95in motors.
to save time and money do a hot 96 with a stock pistons and lower end ,have those heads sent out (i prefer Baisley) have them bump the comp and do a nice cam with a good tune and you would be right along the lines onlty a few less then a 103 with money in your pocket.
now theres a reason i say this next yr most will want to do another build so why nott wait till next yur and do a bigger 117,120 or 124.
doing a hot 96 now and doing a good bigger cubic motor makes sense financially also.
if you have a great set of heads you dont even have to send them out to be ported just freshened up.
l
Banned
Joined: Sep 2009
Posts: 7,580
Likes: 7
From: The Internet (& Dyer, Indiana)
a 96 ci motor is only 1 ci more then a 95 and for yrs we have made kits for th e95 in motors to scream.
with a little work to the pistons and a set of good heads and a cam these 96ci motors will rock remember they already have a longer stroke then the 88-95in motors.
to save time and money do a hot 96 with a stock pistons and lower end ,have those heads sent out (i prefer Baisley) have them bump the comp and do a nice cam with a good tune and you would be right along the lines onlty a few less then a 103 with money in your pocket.
now theres a reason i say this next yr most will want to do another build so why nott wait till next yur and do a bigger 117,120 or 124.
doing a hot 96 now and doing a good bigger cubic motor makes sense financially also.
if you have a great set of heads you dont even have to send them out to be ported just freshened up.
l
with a little work to the pistons and a set of good heads and a cam these 96ci motors will rock remember they already have a longer stroke then the 88-95in motors.
to save time and money do a hot 96 with a stock pistons and lower end ,have those heads sent out (i prefer Baisley) have them bump the comp and do a nice cam with a good tune and you would be right along the lines onlty a few less then a 103 with money in your pocket.
now theres a reason i say this next yr most will want to do another build so why nott wait till next yur and do a bigger 117,120 or 124.
doing a hot 96 now and doing a good bigger cubic motor makes sense financially also.
if you have a great set of heads you dont even have to send them out to be ported just freshened up.
l
Then it came to "Heads are off, might as well port them", then came "Wow, zero more bolts to pull the jugs".
Point being that he will have to totally tear apart a motor to do the 103 later, as opposed to doing it now while the heads are off and the added labor will be so minimal.
.