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Re: how effective are performance pistons? #21578
Wed Mar 30 2005 02:31 AM
Wed Mar 30 2005 02:31 AM
R
Richard  Offline
Shop Shark
Joined: Apr 2000
Posts: 487
California
Hotrod lincoln, I think you've had a brain fart and forgotten that the 292 has a 10.875" deck as opposed to the 9.150" of the 250. A 307 or 250 piston would be .370" below the deck in a 292.
Instead of rods that are .250" shorter, find some rods that are 1/4" longer and cheap and you would really have something. 230 pistons also have a 3.875" dia, but they have a compression height of 1.795". That is 2.025" - 1.795" = .230". The 7.00" rods from Sissell's are .240" longer than stock. I'm sure Sissell's steel rods are nice, but $11-1200 rods with stock cast 230 pistons sounds too weird to think about.
The 230 pistons should weigh a lot less than 292 pistons and if I'm not mistaken, have a smaller dish than even a 250. 292 LPG pistons weigh in at 35 grams more than stock 292 and they are not cheap. Prices vary widely, from $45 to $80 each.
You find some cheap 1/4" longer rods and you'll have my attention.


'67 GMC 3/4 292 4spd
Re: how effective are performance pistons? #21579
Wed Mar 30 2005 07:52 AM
Wed Mar 30 2005 07:52 AM
M
Murdoc  Offline OP
Wrench Fetcher
Joined: May 2003
Posts: 224
idaho
mugsy,

yeah ive read through that webpage like three times before!! its funny cause its the first thing that always pops up when i google "chevy 292" its a great source of information tho, thanks for bringing it up on this thread.

Re: how effective are performance pistons? #21580
Wed Mar 30 2005 08:07 AM
Wed Mar 30 2005 08:07 AM
M
mugsy  Offline
Shop Shark
Joined: Mar 2004
Posts: 745
Lockhart, TX
Yeah, it's especially useful for me 'cause it mentions shops here in the San Diego area. I'll be checkin' out the machine shop that did the work when I'm ready to do my 292.
-David


Tradin' up dimes for nickels...
'`'`'`'`'`'`
My \'65 Chevy C-20
Re: how effective are performance pistons? #21581
Wed Mar 30 2005 05:32 PM
Wed Mar 30 2005 05:32 PM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 18,564
Dellrose, TN
OK, Richard, you got me there! I was not considering the difference in deck height! That's what I get for not having a block specification book handy when I start window-shopping piston and rod catalogs! Mea culpa!
:rolleyes: :rolleyes: :rolleyes:
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: how effective are performance pistons? #21582
Wed Mar 30 2005 07:28 PM
Wed Mar 30 2005 07:28 PM
D
DJ  Offline
Member
Joined: Feb 2005
Posts: 60
At Home
I have allways run a forged piston in everthing we ever built on the street. No noise with .005 to .006. No oil cosumption.I sure would never build one for the street if i was going to put a blower turbo or gigle juice to it with out forged pistons.Now some of these motors are run 10 years and over 100000 miles no problems. Every engine builder has a diff way. I know what you mean with a race forged piston but thats a total diff animal.Some of our long rod motors have such a small wist pin and thin piston they would not last on the street.Have you gotten a 6 3/8 rod in a 355 yet? Not many have. Our IMCA motor with a 2 ring coated forged piston only runs a .003 cyl wall clearance. Before we used coatings we up around .008 in the IMCA car but thats all old tech now.Have you seen the 28 lb crank yet LOL. Just a bit more cash but its so pretty you wont want to put it in a motor.
Oh well cant talk to much about the IMCA motor as its 19 grand with a claim of 1500 bucks so we will keep that stuff secret.Never know who reads this stuff LOL
My twist on forged,ask your motor man and piston guy.It changes weekly. Only forged for me. Cast and hype are for ash trays. LOL

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