can anyone give me the specs on this piston? i know its a .060 forged piston and i think the compression ratio with a 118cc head is 12.82.1
but im not sure. thanks

Originally posted by RIPPERS 67:
can anyone give me the specs on this piston? i know its a .060 forged piston and i think the compression ratio with a 118cc head is 12.82.1
but im not sure. thanks =
It's listed at about 13.0 compression & is a 454 piston
1.645ch, & a 50cc dome.
Replaced by the SpeedPro 7040PA & available in std to .125 over

thanks mike, would you happen to know what the recommended piston to wall clearance would be on this piston?

Originally posted by RIPPERS 67:
thanks mike, would you happen to know what the recommended piston to wall clearance would be on this piston? =
Don't know if the numbers have changed but TRW & the factory forged pistons were .005-.006 for street/strip use.
Been over 20 years since I used TRW pistons of these types.
Too many good aftermarket pistons out there now that won't break your foot if you drop them on it :D
Those pistons are like 700 grams without a pin as I recall :(

i believe those are the same pistons i have in my 468 .......its been some time since i built my motor and lost my paper work that had the part number wrote on them......i called to get some specs on the pistons like in 2000 and they stopped making them in 1991 and and they was calling for .002-.003 clearence on them.....i couldnt believe what they was telling me but they said the material was different then the older forged units and required less piston to wall clearence........

are they 1/16" rings........if so that might be be the same ones i have.......

i would call around like i did till you find someone who can tell you more about them.....

im currently running them at .009 in the best hole and .013 in the worst hole......i figured for used pistons (125 bucks) with rods i would give them a shot......no noise from the motor when cold with that much clearence( i was surprised)

if they are 1/16" rings then be ready for rings being around 130 bucks..the cheapest ring set i could fine was from doug herbert.....

oh i forgot to mention those domes are so huge on there i had to clearence the heads for them to fit......i tried putting my head on without gaskets and the head would not sit down on the block........all day job...uhhgggg......

whats deenis, i have about .007

whats up deenis, i have about .007 piston to wall clearance on them right know. and your right about the dome. mine measures .580. my pistons have a hollow dome which i think they would not be as heavy. they could be th lw series but wouldnt that be stamped on the piston also? i was going to have them flycut to lower the compression but there is not enough material underneath the dome.

All of the 2307's are heavy, 700+ without pin.
As far as I know all of the 2307's are designed to be run between .004 &.007 clearance depending on application.
Rings are 1/16-1/16/3/16
The dome is 50cc .580"
The Speedpro replacement is also 700+ grams but I don't know the clearance for sure on them.

It's fairly easy to tell the nominal clearance of a piston,, just measure it as the minimum clearance is built into the piston with the exception of standard bore stuff.
Yours should measure about 4.305-306 for .004-.005 clearance.

I had mine set at .0045" piston/bore. The dome thickness is .400" (not height which as stated, is .580") and I cut .150" off of mine, leaving a dome thickness of .250" . I'm told I could have taken another .050" off and been safe. The 2307 piston is what was put in the LS-7.

Rip,
The TRW catalog shows the clearance at .005" This is the "minimum" recommended clearance and might need to be more depending on your application, such as NOS or a blower.
By the way, just for education, there are plenty of TRW, and other, forged pistons that are run at much tighter clearances, such as .0015" . It depends on the alloy and the design of the piston so you should never use a general figure for all forged pistons ... ALWAYS go by the manufacturers figures.