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marstang92 · 03-13-2003, 02:44 AM

Hi, I lucked out and found a roller 351w from a 95 lightning that I'm having rebuilt for my Mustang. The guys at the local parts store told me that in their books for the pistons it only goes up to 93. And even on the pre 93 pistons there is a side note that says except lightning. So, My question is. Is there a difference between lightning pistons and regular 351 windsor pistons? If there is a difference what is it? Could I use regular 351w forged pistons in my lightning block? Thanks....Marc

JT Racin · 03-13-2003, 11:18 AM

The 1st Gen. Lightnings 351W used a dished piston and had a Comp. Ratio of only 8.8:1. w/ the GT40 Iron heads.
Really depends on what you had plan to do with the engine and what CR.

Being a parts store most of them usually sell a TRW/Sealed Power type piston, which are OK, but they are heavy slugs.

JT

marstang92 · 03-13-2003, 12:15 PM

So, I guess I could put any 351w piston in there as long as it's the compression ratio that I want? The lighter the better i'm guessing. Thanks...Marc

mercoug302 · 03-13-2003, 03:20 PM

Yes they do. All roller 5.8 blocks have the same pistons. My 1997 F-250 shortblock has the same pistons in a 1994 lightning motor. They have huge valve reliefs.

I had to mill my TFS heads down to 43cc's per chamber just to get a 10:1 CR.

marstang92 · 03-14-2003, 01:07 AM

So when I order pistons do I have to tell them it's a roller block? Or could I just get TRW 351w pistons for any year? ....Marc

JT Racin · 03-14-2003, 01:19 AM

Roller block/ Non roller block doesn't matter. They still have same bore and stroke. Use same pistons

You will need a 351W piston for the later block with the 9.503 deck height. Are you planning on a cast replacement piston or going with a forged???

Let me know I have a Federal Mogul (TRW)/Speed Pro performance catalog for part #'s. What head is going to be used?

JT

marstang92 · 03-14-2003, 02:33 AM

I have Edelbrock Performer heads. With 202 valves. Let me know the part number or specs on the pistons. Thanks....Marc

marstang92 · 03-14-2003, 02:34 AM

Also....I'm going with the forged pistons. I need a 30 over. ....Marc

JT Racin · 03-14-2003, 09:50 AM

The L2446F30 would yield ya about 9.3:1 CR with that Edelbrock head. It consist of a .110 dish.

What CR did you want to be at. Is this N/A, blower etc....
I see you have used DSS shortblock in past. Have you considered there piston only kits. They would be somewhat lighter and more custom to your needs.

03-13-2003, 02:44 AM	#1
marstang92 Registered User Trader Feedback: (1) Join Date: Oct 2000 Location: Northeastern Pa Posts: 28	Lightning pistons same as reg 351w pistons?? Hi, I lucked out and found a roller 351w from a 95 lightning that I'm having rebuilt for my Mustang. The guys at the local parts store told me that in their books for the pistons it only goes up to 93. And even on the pre 93 pistons there is a side note that says except lightning. So, My question is. Is there a difference between lightning pistons and regular 351 windsor pistons? If there is a difference what is it? Could I use regular 351w forged pistons in my lightning block? Thanks....Marc __________________ 95 Lightning 351w 30 over, H beams, Probe pistons, balanced assy. Edelbrock heads 2.02/1.60 valves, Crower 15512 cam, GT-40 intake, 75mm T/B, 42 lbers, 80 mm C&L, BBK 1 3/4 L/Ts, Novi 2K, center force d/f clutch, 3.73s and a factory T-5. All in a 92 vert.

03-13-2003, 11:18 AM	#2
JT Racin Registered User Trader Feedback: (0) Join Date: Aug 2001 Location: Harrod,OH usa Posts: 408	The 1st Gen. Lightnings 351W used a dished piston and had a Comp. Ratio of only 8.8:1. w/ the GT40 Iron heads. Really depends on what you had plan to do with the engine and what CR. Being a parts store most of them usually sell a TRW/Sealed Power type piston, which are OK, but they are heavy slugs. JT __________________ Stock short block, AFR 185's,XE274HR... "Tons of Suspension"... 11.69 @ 116mph on "Nothing but Atsmophere"...PRICELESS "Live Fast...Die Young...Leave a Good Looking Corpse"

03-13-2003, 12:15 PM	#3
marstang92 Registered User Trader Feedback: (1) Join Date: Oct 2000 Location: Northeastern Pa Posts: 28	So, I guess I could put any 351w piston in there as long as it's the compression ratio that I want? The lighter the better i'm guessing. Thanks...Marc __________________ 95 Lightning 351w 30 over, H beams, Probe pistons, balanced assy. Edelbrock heads 2.02/1.60 valves, Crower 15512 cam, GT-40 intake, 75mm T/B, 42 lbers, 80 mm C&L, BBK 1 3/4 L/Ts, Novi 2K, center force d/f clutch, 3.73s and a factory T-5. All in a 92 vert.

03-13-2003, 03:20 PM	#4
mercoug302 Registered User Trader Feedback: (0) Join Date: Apr 2002 Location: the west Jersey shore Posts: 310	Yes they do. All roller 5.8 blocks have the same pistons. My 1997 F-250 shortblock has the same pistons in a 1994 lightning motor. They have huge valve reliefs. I had to mill my TFS heads down to 43cc's per chamber just to get a 10:1 CR. __________________ 1988 Mercury Cougar XR7

03-14-2003, 01:07 AM	#5
marstang92 Registered User Trader Feedback: (1) Join Date: Oct 2000 Location: Northeastern Pa Posts: 28	So when I order pistons do I have to tell them it's a roller block? Or could I just get TRW 351w pistons for any year? ....Marc __________________ 95 Lightning 351w 30 over, H beams, Probe pistons, balanced assy. Edelbrock heads 2.02/1.60 valves, Crower 15512 cam, GT-40 intake, 75mm T/B, 42 lbers, 80 mm C&L, BBK 1 3/4 L/Ts, Novi 2K, center force d/f clutch, 3.73s and a factory T-5. All in a 92 vert.

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03-14-2003, 01:19 AM	#6
JT Racin Registered User Trader Feedback: (0) Join Date: Aug 2001 Location: Harrod,OH usa Posts: 408	Roller block/ Non roller block doesn't matter. They still have same bore and stroke. Use same pistons You will need a 351W piston for the later block with the 9.503 deck height. Are you planning on a cast replacement piston or going with a forged??? Let me know I have a Federal Mogul (TRW)/Speed Pro performance catalog for part #'s. What head is going to be used? JT __________________ Stock short block, AFR 185's,XE274HR... "Tons of Suspension"... 11.69 @ 116mph on "Nothing but Atsmophere"...PRICELESS "Live Fast...Die Young...Leave a Good Looking Corpse"

03-14-2003, 02:33 AM	#7
marstang92 Registered User Trader Feedback: (1) Join Date: Oct 2000 Location: Northeastern Pa Posts: 28	I have Edelbrock Performer heads. With 202 valves. Let me know the part number or specs on the pistons. Thanks....Marc __________________ 95 Lightning 351w 30 over, H beams, Probe pistons, balanced assy. Edelbrock heads 2.02/1.60 valves, Crower 15512 cam, GT-40 intake, 75mm T/B, 42 lbers, 80 mm C&L, BBK 1 3/4 L/Ts, Novi 2K, center force d/f clutch, 3.73s and a factory T-5. All in a 92 vert.

03-14-2003, 02:34 AM	#8
marstang92 Registered User Trader Feedback: (1) Join Date: Oct 2000 Location: Northeastern Pa Posts: 28	Also....I'm going with the forged pistons. I need a 30 over. ....Marc __________________ 95 Lightning 351w 30 over, H beams, Probe pistons, balanced assy. Edelbrock heads 2.02/1.60 valves, Crower 15512 cam, GT-40 intake, 75mm T/B, 42 lbers, 80 mm C&L, BBK 1 3/4 L/Ts, Novi 2K, center force d/f clutch, 3.73s and a factory T-5. All in a 92 vert.

03-14-2003, 09:50 AM	#9
JT Racin Registered User Trader Feedback: (0) Join Date: Aug 2001 Location: Harrod,OH usa Posts: 408	The L2446F30 would yield ya about 9.3:1 CR with that Edelbrock head. It consist of a .110 dish. What CR did you want to be at. Is this N/A, blower etc.... I see you have used DSS shortblock in past. Have you considered there piston only kits. They would be somewhat lighter and more custom to your needs. __________________ Stock short block, AFR 185's,XE274HR... "Tons of Suspension"... 11.69 @ 116mph on "Nothing but Atsmophere"...PRICELESS "Live Fast...Die Young...Leave a Good Looking Corpse"

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