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Re: 426 Wedge Piston
[Re: Maximus_Wedges]
#241293
03/02/09 09:22 PM
03/02/09 09:22 PM
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Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
master
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master
Joined: Nov 2003
Posts: 6,293
Rock Springs
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What pistons? Some of the Older TRW stuff requires diff clearances than the newer CP, Diamond pistons, they don't expand as much, which requires tighter piston/bore clearance.
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: 426 Wedge Piston
[Re: Cab_Burge]
#241297
03/03/09 01:06 AM
03/03/09 01:06 AM
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Joined: Jan 2005
Posts: 1,260 Las Vegas NV
moparmanjames
pro stock
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pro stock
Joined: Jan 2005
Posts: 1,260
Las Vegas NV
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Quote:
Those sound like the OEM ("Thompson Products" which later became TRW) pistons for the low compression 1963 415 HP M.W. motors. Before making a choice on using them check the skirts for collapse very carefully and the ring land clearances, if the pistons where used at all Also make sure the 413 block is thick enough(sonic test it) before having it bored out
Dang Cab you know your stuff
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Re: 426 Wedge Piston
[Re: Maximus_Wedges]
#241300
03/03/09 12:38 PM
03/03/09 12:38 PM
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Joined: Aug 2003
Posts: 43,174 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,174
Bend,OR USA
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I don't remember if the 415 hp was advertised as 11.25 or 11.50, either way they weren't what they advertised, they where lower. Bill Jenkins got NHRA to change the dome height on the 1963 415 HP only to .090 or .093, I can't remember which exactly. I used the stock pistons and ran them that way, some guys would take a set of 1964 415 HP pistons and machine the dome down to the .09? spec and get more compression. If your making a street and strip motor on pump gas with a iron head it will detonate like crazy any where near 11:0 to compression ratio and kill the motor unless you use E85 for fuel I have a 9.4 to 1 compression 446 C.I. that I can make detonate by leaning down the primary part throttle cruise AFR to 14.3 or higher That is on Oregon 92 octane at 2500 ft. above sea level
Last edited by Cab_Burge; 03/03/09 11:28 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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