Displacement for a Ti
My comment wasn’t in reference to you lol.
I am cranky today though. Been dealing with the fact my hr department is incompetent so my family hasn’t been insured. When I got married and changed my insurance they all kept passing the buck and lost my info instead of entering it so we’ve been uninsured.
I am cranky today though. Been dealing with the fact my hr department is incompetent so my family hasn’t been insured. When I got married and changed my insurance they all kept passing the buck and lost my info instead of entering it so we’ve been uninsured.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 222
Likes: 46
From: Dayton, OH
3.622 X 4.125 with untouched LS3 heads/intake is capable of maxing out that blower with room to grow... the bore allows the heads to breath, even when you get them ported with larger valves... crank allows room to increase stroke if you want, but for now the journal overlap is stronger (if we must have a reason)... like I said, the heads can be ported, intake can be likewise ported or replaced...
I personally don't care what you go with. I only stated what I would do if I had a sleeved block. I prefer all bore and stock stroke because bore helps with flow and the short stroke allows more "meat" in the ringland area. A 388 is a stout combo the mains and block flex are probably the weakness at that point. I went with an ls3 block for my 377 which is basically the closest thing I could get to a 388 for way less money. Boost doesn't really care about cubic inches so I don't feel there is an optimum displacement for the little blower. Anything from a 5.3 to a 427 would work fine it would just move the curves around and probably make the same peak power although boost levels would vary depending upon the efficiency of the motor. Your blower will be out of breath on anything over a 388 I would guess. The large bore of the 388 will allow you to run any heads you want and allow them to flow to their potential, but great heads aren't really needed for the amount of power that blower is capable of. I still have 241 heads on my motor LOL. You could make 900 wheel with that blower with 8 pounds of boost or 17 pounds of boost just depends upon the efficiency of the engine and where you want the curves to be.
I assumed that you had a good reason to specify 388 and I wanted to know what it was. Thank you.
I understand what you said about the 4.125 bore allowing it to breathe better. Thanks!
Bigger bore definitely helps with flow and unshrouding the valves, but I also like some meat in the cylinder walls. It's 1 reason why stock 4.8s and 5.3s can make the power they can. Up to a 4 inch stroke doesn't bother me unless you're turning big rpm.
I would think a sleeved block would have no issue with wall thickness even with a 4.125 bore. I have no personal experience with that so I’m only speculating there. My reason for stock stroke is related to the ability to have more material and strength in the ring lands area where with the 4” stroke that area gets shorter.
All of that may be less of a concern then block flex or crank flex effecting the mains at high hp levels though.
the work from home pussies are still putting my family at risk by leaving us uninsured due to their negligence and I’ve yet to get this resolved. 23 years of service here with perfect attendance during a pandemic including working more overtime this past year than ever due to being short handed with no one wanting to work and this is what I get for it.
All of that may be less of a concern then block flex or crank flex effecting the mains at high hp levels though.
the work from home pussies are still putting my family at risk by leaving us uninsured due to their negligence and I’ve yet to get this resolved. 23 years of service here with perfect attendance during a pandemic including working more overtime this past year than ever due to being short handed with no one wanting to work and this is what I get for it.
I'm certainly no piston expert but I believe the ringland concern is a non-issue with today's designs as long as you choose a piston manufacturer design that was done specifically for stroker engines.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 222
Likes: 46
From: Dayton, OH
Thanks for all the great replies.
A short skirt on the piston or have a longer sleeve. The Darton sleeves that will be used in my block are 5.8", same length as the 427 LS7.
I'm looking at JE Pistons Ultra series and billet main caps to try to keep the crank from flexing.
The Ultra series are designed both for boost and stroked applications. Ceramic coating on the top of the piston to reject heat and a special coating on the skirt to reduce slapping when cold (2618 pistons).
9310 wrist pins, .200" diameter
I'm looking at JE Pistons Ultra series and billet main caps to try to keep the crank from flexing.
The Ultra series are designed both for boost and stroked applications. Ceramic coating on the top of the piston to reject heat and a special coating on the skirt to reduce slapping when cold (2618 pistons).
9310 wrist pins, .200" diameter
Last edited by SteveJewels; Jan 7, 2021 at 11:57 AM. Reason: Add detail on the pistons
Thanks for all the great replies.
A short skirt on the piston or have a longer sleeve. The Darton sleeves that will be used in my block are 5.8", same length as the 427 LS7.
I'm looking at JE Pistons Ultra series and billet main caps to try to keep the crank from flexing.
A short skirt on the piston or have a longer sleeve. The Darton sleeves that will be used in my block are 5.8", same length as the 427 LS7.
I'm looking at JE Pistons Ultra series and billet main caps to try to keep the crank from flexing.
