[Tigers] FW: motorsport x 302 crate motor

[Mark Rense]

Nick, as an engine builder I have seen a general deterioration of component
quality in the after market as more manufacturers outsource. Lifters are
one of those components, I stopped using CompCams because I've had bad
hydraulic lifters from them more than once. You could have a bad hyd.
lifter or bad roller rocker.

Piston scuffing at low miles is caused by clearance issues combined with
heat and/or lack of lube.  I would be very suspicious of the pan clearance
and your oil pickup location/screen since you have had two separate
incidents. Scuff marks on the piston's edges or corners of the thrust side
is probably bore distortion. If it is scuffed on both sides then lube is
the main suspect, check the piston wrist pin as it may have seized.

The Ford 302 you bought is a rebuild, not a fresh block or rotating
assembly, and you are not the the first to have issues with one of these.
Their strokers and race engines are built in-house, I'll bet the 340hp 302
is not.

I've got three 5-bolt 289 blocks left. How about a nice drop-in 331?

Bugz

On Tuesday, April 14, 2015, Nick via Tigers <tigers at autox.team.net> wrote:

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> *From:* Nick [mailto:scattt at verizon.net
> <javascript:_e(%7B%7D,'cvml','scattt at verizon.net');>]
> *Sent:* Monday, April 13, 2015 8:03 PM
> *To:* 'Andy Walker'
> *Subject:* motorsport x 302 crate motor
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> I am helping a friend with a Tiger we are reassembling after 10+ years of
> being off the road. We purchased a 302/340hp engine from Ford Motorsport to
> install in this application. We installed the engine without difficulties
> with a front sump oil pan, new pickup and right angle oil filter from
> motorsports.  It has a air gap manifold, 600cfm Edelbrock  and a pertronix
> dizzy. The engine started and  broke in without issues but after about
> seven miles on the road it developed a knock. Dropping the oil pan we
> discovered the #2 piston was scuffed around the skirt. Sent it back and
> Ford replaced with another block claiming they couldn’t determine what the
> cause was.  The new engine we had broken in by a local speed shop and
> dynoed.  It put out 320 Hp which we expected.  Reinstalled the engine and
> after about 20 miles on the road it developed what sounds like a lifter
> tapping. With great difficulty we removed the valve covers and started the
> engine.  Everything on the top end looks and feels perfect but we still
> have the tapping. Put the engine back together and installed another set of
> exhaust headers with copper gaskets and the proper sealer thinking we
> possibly could have a cracked header or leak. The problem persists and I am
> afraid we may find another scuffed piston. The oil pressure has never
> dropped below 20# even at idle.
>
> Has anyone out there experienced a similar problem with these engines of
> have a suggestion as to what our issues may be. ? The people at Ford
> Motorsports are scratching their heads!
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> Thanks,
>
> Nick Kintner
>
> Florida
>
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