JBA 351W headers on a 289 - Vintage Mustang Forums
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post #1 of 3 (permalink) Old 01-30-2002, 06:24 PM Thread Starter
Join Date: Dec 2001
Location: SF Bay Area, CA
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Does anyone know if the JBA headers for a 351W swap (pt # 1653) will fit in a '65 with a 289/302? I NEED to get headers now since my old ones are shot, but I'd rather get the 351W set in case I decide to go ahead with that swap down the road.

I suspect that the 1653's are designed the hug the 351 block, which since it's taller would push the collector INTO a small block, and thus not fit. Though, it might alleviate the gear box clearance issue.

Also, any info/stories on the motor mount swap (read: fiasco) would be appreciated.
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post #2 of 3 (permalink) Old 01-30-2002, 06:36 PM
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Join Date: Mar 2001
Location: Southeast Texas
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I had a similar situation where I used '70-351C headers on the Boss 302 in my '65. The shorter block deck made them hit the tie rod ends when the wheel was turned almost to lock. Nothing critical, but very annoying. I ended up shimming the block up on the motor mounts about 3/8" to stop the rub. They cleared everything else okay.

Dave J

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post #3 of 3 (permalink) Old 01-31-2002, 12:02 AM
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Location: Central California
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I can scrutinize the JBA's on my D-coder and see if anything pops to mind as a clearance issue...

As the W's deck is merely 1" taller, one problem I could see is a possible interference with the engine mount on a 289/302. The W's crankcase is wider so the headers can't suck back against the block too much... and, since both engines utilize the same bank angle and have the same bore and bore spacing, the headers will mount in the same plane on both.
Another possibility might be idler arm or starter clearance problems...hmmm

Interesting question....

I think it would be worthwhile contacting JBA on this one....they'll know best.

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