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Discussion Starter · #1 ·
Hi, I have a 427" LSX and am wondering how far I can push this thing. Crank is a 4" dragon slayer with compstar ibeam rods and 4.125" wiseco pistons.Trickflow 245 heads are fully studded including the mains. on a DTS engine dyno it made 992hp and 1006 torque at 10psi on pump gas. Car went 9.44 @147 so far with a crappy 60 foot.My concern is the piston design with the wrist pin up so far onto the oil ring that the piston may not be able to handle a ton of pressure. If I had it to do over again I think I would shorten the stroke to 3.875" or less to get a stronger piston. Thank you.
 

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Hi, I have a 427" LSX and am wondering how far I can push this thing. Crank is a 4" dragon slayer with compstar ibeam rods and 4.125" wiseco pistons.Trickflow 245 heads are fully studded including the mains. on a DTS engine dyno it made 992hp and 1006 torque at 10psi on pump gas. Car went 9.44 @147 so far with a crappy 60 foot.My concern is the piston design with the wrist pin up so far onto the oil ring that the piston may not be able to handle a ton of pressure. If I had it to do over again I think I would shorten the stroke to 3.875" or less to get a stronger piston. Thank you.
992hp/1006 tq @ 147, must have been a 2.xx 60' ?
 

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Chupa Cabra
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Yep, the pistons are fine, it’s the block you need to worry about. Thay have known casting shift issues.
Only if it's your machinist would you have to worry.

A competent ls engine builder already knows this and will make sure the block doesn't have this problem, and if it does they will fix it or get a new block.

Screw it, just put a modular in it right? That will fix it.
 

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LSXTTFMF
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Just looking at the torque number looks to me like it's choked up on the turbo. As far as the motor goes you have a good way's to go. I would be more worried about the I-beam rods than I would the Wiseco pistons.
 

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LSXTTFMF
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At that power level no issues, however the compstar I-beam rods aren't really rated for huge power. Now my question is it the Compstar HD rods or just a regular compstar I-beam?
 

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Discussion Starter · #13 ·
Thanks, for the replies. It may be a little choked on the turbo being that all I have on her is a Bullseye comp-r-83 with a t-6 1.32 housing, fun on the street but probably holding me back at the track. The rods are just the regular I-beams. Do you think I could get this thing to go 8.50's without changing anything but boost in a 1965 chevelle that weighs 3640 with me in it? Otherwise should I just hang a 98 on it instead?
 
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