Pistons to use with cobra jet rods.

A

Anonymous

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I scored a 425 today for $150 bucks.  its going to see 5 grand once and while its a mud racing truck.
 
A

Anonymous

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You wont have any trouble with the Caddy rods at 5000, I would recommend putting arp rod bolts in it while at the machine shop  :twocents:  :thumbup:   
 
A

Anonymous

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I was reading about the 403, 7 inch rod combo.  Im thinking of going in this direction.
 

dave brode

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The 403s are apx 40 or so thou shorter than optimum. You'll have to whack the heck out of the deck if you want tight quench.
Dave



link=topic=1062.msg11219#msg11219 date=1112644114]
I was reading about the 403, 7 inch rod combo.  Im thinking of going in this direction.
 
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Anonymous

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Yes,if your going to want an open chamber head and pump gas
otherwise its custom pistons and race gas..TI
 

dave brode

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Olds = 7"? If that's what you mean, if you want a longer rod, the 7" rod and 454 pistons deal is an option, but really only for a 120cc head pump gas deal with flat tops, for most apps.

More fyi - There are 8.5cc dish 454 forgings from Speedpro up to 4.310". There are 18 cc dish hypers from KB up to 4.350". There are dished forgings in 4.35" and so on with various dish volumes from JE, Ross, SRP, etc. The dished 454s *may* work for a 10.5-1 to 11-1 compression 76cc combo, but afaik, nobody's tried it yet.

Fwiw, imo, for a good pump gas deal [10-1 or so] with 76cc heads, the caddy rods, or 6.735" olds rods and Caddy KBs [or ebay Caddy Ross] pistons look like the best deal to me.
Dave








link=topic=1062.msg11225#msg11225 date=1112651059]
So the olds, chev piston is still the way to go
 
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