351 in a 90 LX

eddielugnutz · 10-04-2005, 01:32 AM

Wow man, I'm happy for you, 12.7? Do you have a lot of weight reduction? What's your track weight? I have a nearly stock 351 with a stock cam, just bolt on's and EFI, I had to leave it stock because I didn't know what the hell i'm doing! Can you, or someone answer a few questions for me? I currently have a stock truck intake with all the stock hardware on it from a truck. I thought it made more horsepower, but I found out that it only makes 240hp and it is actually slower than my stock 5.0 with work done. It felt quicker than my Z28 at first (14 seconds), but really not by a long shot, I think it was all my excitment in the swap that got me cocky. OK, here's my questions, I'm a newbie, so please don't make fun of me:

I heard that all 351W motors have the same firing order as the 5.0HO 1-3-7-2-6-5-4-8
Is this true, and , is a 302 and 351W cam interchangeable? I ask because I have a B303 cam for my old 5.0, can I just use it in my 351W?

Also, are 351W and 302 heads interchangeable? I know a 302 has a bore and stroke of 4.00 by 3.00", and a 351W has a bore/stroke of 4.00 by 3.50", so the stock heads from my 351 should fit on my 302 right?

What is a 351M? I'm sorry I don't know what the M stands for. and are 351 windsor and 351M parts interchangeable?

Thanks for the help.

I thought I was all bad ass with my 351 swap, man was I wrong, I have a lot of work ahead of me, luckily I have all the time in the world this winter to build a decent motor for the spring, no rush.

68Falcon · 10-04-2005, 04:43 AM

My car weights 3200 with me in it.

82 GT · 10-04-2005, 06:50 AM

The firing order are thge same.
Your B cam won't work in your 351w unless you convert it to a roller block like the 86-95 5.0 engines.
They will interchange if both blocks are non-roller blocks(pre-86)
In other words, they must both be "roller" blocks to interchange.
The heads will interchange but not wothout modifications to your 302 block. It must be drill out to accept the 1/2 bolts that are used on the 351w. The 302 heads use 7/16 bolts.

I'll let somone else explain the "M" motor cause I gotta go!
Hope this helps

10-04-2005, 01:32 AM	#1
eddielugnutz Registered Member Join Date: Sep 2005 Posts: 41	Re: 351 in a 90 LX Wow man, I'm happy for you, 12.7? Do you have a lot of weight reduction? What's your track weight? I have a nearly stock 351 with a stock cam, just bolt on's and EFI, I had to leave it stock because I didn't know what the hell i'm doing! Can you, or someone answer a few questions for me? I currently have a stock truck intake with all the stock hardware on it from a truck. I thought it made more horsepower, but I found out that it only makes 240hp and it is actually slower than my stock 5.0 with work done. It felt quicker than my Z28 at first (14 seconds), but really not by a long shot, I think it was all my excitment in the swap that got me cocky. OK, here's my questions, I'm a newbie, so please don't make fun of me: I heard that all 351W motors have the same firing order as the 5.0HO 1-3-7-2-6-5-4-8 Is this true, and , is a 302 and 351W cam interchangeable? I ask because I have a B303 cam for my old 5.0, can I just use it in my 351W? Also, are 351W and 302 heads interchangeable? I know a 302 has a bore and stroke of 4.00 by 3.00", and a 351W has a bore/stroke of 4.00 by 3.50", so the stock heads from my 351 should fit on my 302 right? What is a 351M? I'm sorry I don't know what the M stands for. and are 351 windsor and 351M parts interchangeable? Thanks for the help. I thought I was all bad ass with my 351 swap, man was I wrong, I have a lot of work ahead of me, luckily I have all the time in the world this winter to build a decent motor for the spring, no rush. __________________ 88 Lx project. 96 Z28 daily driver.

10-04-2005, 04:43 AM	#2
68Falcon Bracket Racer Join Date: Apr 2003 Location: Loxahatchee, Florida Posts: 210	Re: 351 in a 90 LX My car weights 3200 with me in it. __________________ Streetcar 90 Notch 69 351W .030 over. Untouched 69 351 heads Crane cams duration @050 216in 228ex. valve lift .484in .512ex. Untouched RPM air gap intake with Holley 750 DP. Hooker headers. C6 trans. 8.8 with 3.73, Strange 31spline alxes and spool Racecar 68 Falcon 10 point Cage and FE487ci 13.6:1 compression. .740 lift 276in 284ex duration @.050 in the Works. 428CJ heads. Port O Sonic intake with 1050 Dominator. PowerGlide trans.

10-04-2005, 06:50 AM	#3
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	Re: 351 in a 90 LX The firing order are thge same. Your B cam won't work in your 351w unless you convert it to a roller block like the 86-95 5.0 engines. They will interchange if both blocks are non-roller blocks(pre-86) In other words, they must both be "roller" blocks to interchange. The heads will interchange but not wothout modifications to your 302 block. It must be drill out to accept the 1/2 bolts that are used on the 351w. The 302 heads use 7/16 bolts. I'll let somone else explain the "M" motor cause I gotta go! Hope this helps __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

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