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  Mustangsandmore Forum Archive
  Ford Racing
  Long rod 351W

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Author Topic:   Long rod 351W
Buster
Gearhead

Posts: 1821
From: Hurricane alley
Registered: May 2002

posted 06-08-2002 01:27 PM     Click Here to See the Profile for Buster        Reply w/Quote
If anyone is interested in this combo, here it is. I built this engine combo more then once and it was one of the best Street Strip combos that I have ever done for the money.

351W Long rod engine, using 351M / 400M rods.

There was an article on this combo that used forged TRW pistons L2446 I think and fly cut the top .062 or whatever it takes to bring the deck to zero. I used this piston once and all the skirts either cracked or broke away altogether. It didnt do any collateral damage, luckily. Funny thing was, you could take one of the broke off skirts from one piston and put into another, it fit like it was from that piston.

I talked to a friend of mine, about this problem, that built Chevy engines and he had the same problem in two different Chevy engines, which was without fly cutting the tops. I think once you get to the 400 HP mark, thats too much for this piston.

So, I would suggest special ordered JE, Ross, Wiseco ect What piston height ordered would depend on the year of the block. 1969-70 is 9.480 and 1971 and up is 9.503. I set the piston to deck at +.005 above the deck.

The compression ratio would depend on the valve pockets and head gaskets, which is as long as you use the 1969 1970 351W head. If I remember correctly, the chambers are 60cc. Felpro makes at least two head gaskets, one is 8.5cc and the other is 9.5cc.

The cylinder heads I was using were 69 & 70 351Ws. With 1.94 intake & 1.60 exhaust, ported with 1.6 roller rockers.

The rods are 351M/400M. The rod length for a 351W is 5.956 and the Modified rod is 6.580, .624 longer. This changes the rod ratio from 1.70:1 stock 351W to 1.88:1. What happens with a longer rod engine is the piston hangs at TDC longer, more time to burn the fuel. Also, I was able to run 42 to 46 deg total timing on pump gas.

To make the Modified rod work you would need to take .050 off the big end, .025 off each side. There is a boss on the little end that needs to be removed as well, to keep the rod boss from hitting the piston. Its up to the builder whether or not the rods are full floating or pressed fit.

I imbalanced the engine, 48% / 52% lighter reciprocating weight.

The cam used was a Comcams part # 32-000.5

Valve adjustment .020 intake & .022 exhaust
Duration @ .050 244 / 248
Lift .578 intake & exhaust
Lobe separation 112
Seat pressure 145# closed

The compresson ratio was 10.8:1
Through the exhaust, you could hardly hear this cam at idle, it sounded like a stock 5.0 Mustang. With street tires, mufflers and 2 exhaust out the back, the car ran 11.80s and got 19 to 21 mpg on the hwy, 19 with the A/C on. This particular vehicles was a 1988 Mustang with no weight removed, I think it weighted in at 3400 lbs.

I am sure the car with more tuning would run deep into the 11.50s and the street drivability was like a stock 5.0 Mustang. He did me wrong and I stopped working on his car, so I dont really know how much more was in this setup.

If I ever change my 1985 SVO to an eight cylinder, this is the setup I will use. I really like it.

*edit*
Whoops, almost forgot... The rod bearings need to be 351C. I have used King bearings with very good luck.

[This message has been edited by Buster (edited 06-08-2002).]

[This message has been edited by Buster (edited 03-07-2004).]

TomP
Gearhead

Posts: 6376
From: Delta BC Canada
Registered: Dec 99

posted 06-08-2002 02:05 PM     Click Here to See the Profile for TomP        Reply w/Quote
Buster

How much heavier are those rods than stock 351W rods? What rpm are they good for?

I was thinking of offset stroking a 428 with those rods, i have a crank that's .030" under and spun a bearing that seems like a way to make use of it.

Buster
Gearhead

Posts: 1821
From: Hurricane alley
Registered: May 2002

posted 06-08-2002 10:14 PM     Click Here to See the Profile for Buster        Reply w/Quote
From what I understand they are all forged steel spot faced rods and can use the 180,000 psi cleveland rod bolts.
They are .091" longer then the FE rod and .1273 smaller rod journal then the FE. Sounds like you would have something to work with....

Unfortunately, I don't know the weight.

[This message has been edited by Buster (edited 06-08-2002).]

Dave_C
Gearhead

Posts: 1123
From: Gadsden, Al
Registered: Aug 99

posted 06-09-2002 07:28 AM     Click Here to See the Profile for Dave_C        Reply w/Quote
A buddy of mine used to run this same combo. 351W w 351M rods. The rods were polished and had ARP bolts. It had Windsor Sr iron heads and a small-med solid roller. Pistons were Wiseco domes. 12:1 comp.

It was a good runner. Ran 6.30's 1/8 mile in a 2900lb Maverick. All day long. Compare that to another motor of his. 372W, Vic jr heads, almost the same cam specs. Runs 6.50's in the same car.

He still has it, just needs freshened. It's now a backup motor as his primary is a 418W w/C302B heads.

Later,

David Cole

Buster
Gearhead

Posts: 1821
From: Hurricane alley
Registered: May 2002

posted 06-09-2002 11:04 AM     Click Here to See the Profile for Buster        Reply w/Quote
btw, I was using the Weiand Stealth manifold for this setup.

Buster
Gearhead

Posts: 1821
From: Hurricane alley
Registered: May 2002

posted 03-07-2004 06:50 PM     Click Here to See the Profile for Buster        Reply w/Quote
bump

[This message has been edited by Buster (edited 03-07-2004).]

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