What piston manufacture has the best approach to address a domed piston to fit 4.165" bore, an effective volume of approximatlly +5 cc (dome volume - valve pocket volume = effective volume (?))and will fit the Edelbrock 6005?



Dave.

n/m

http://www.fquick.com/garages/viewvehicle.php?id=8822 Streetcar 90 Coupe. Stock 69 351W C6 trans 8.8 rear with 3.73, Strange 31 spline axles and spool



http://www.fquick.com/garages/viewvehicle.php?id=8820 Racecar 68 Falcon. Full Cage and FE 487ci PowerGlide trans. 9'rear with 4.56 with 33 spline axles and spool

X

68 Cougar XR7 street and strip car, 428 4-speed, 3560# of fun, new best 10.43@131.2 1.47 60 ft

Looks very close! I assume that's a Diamond piece! Has the dome been modified or is that Diamond's configuration? Can you offer details as to the job or part number?

Thanks,
Dave.

it is a Diamond piston and they have several FE chambers digitized for domes and reverse dome machining. I don't a job number, I would contact BarryR as he is just down the street from them and has worked with Diamond on the mapping of FE chambers.

This piston is a 4.270 bore but for the 428 "style" Edelbrock chamber. The domes are a custom add on to the "shelf" price but cheap, something like 10 bucks extra per piston.

Diamond has more bore diameters and pin heights for FE than any other manufacturer. For your 428 they have 4.155 4.165 4.175 4.185 bores with pins heights for 3.78 3.98 4.125 4.250 strokes available in every bore. Same with 390 and 427 diameter bores.

68 Cougar XR7 street and strip car, 428 4-speed, 3560# of fun, new best 10.43@131.2 1.47 60 ft

Diamond has a pretty usable domed 427 piston that we can tweak for other uses. The dome just barely tags a factory MR chamber in the two spots where it closes in around the deep side - just a couple inward facing points in the gasket face shape - most chambers that have been worked over will not have any issue at all. It works OK on Ed heads, and can work on most anything within ten minutes with a grinder and a light touch. I'll often test assemble without a head gasket and painting the piston dome with a magic marker - any contact will show up instantly as a bright silver mark. guarantees at least .040 clearance everywhere that way.

Barry Rabotnick
Survivalmotorsports.com

custom pistons in about a week and they almost look as if they were jewelry. You might call Chris @ 310 536 0100.

for my .030 (and then some) over 427. Will need a dome, but also cut for 428 CJ heads and valve spacing. This will depend on what I buy for a crank though. If I keep the 3.98 stroke, I could just get 2 replacement Arias and be done.

Any idea on who makes the lightest piston? If I change, don't want to be going heavier (608 grams). Dreaming out loud here once again..

If you want domes done right, get some moulding compound and pull a mould of head bolted to block, up side down. Send pistons with a blob and mold to Ronnie Baxter at Rebco Machine in Augusta Kansas. They will machine 'em so they fit and lighten 'em. On my new 542,I took head with valves to Arias and they machined pistons to match chambers with a small dome. Heads were BT Hi risers ported by Brian Hanson at R&R Performance and the guys at Arias were really impressed with the craftsmanship of the porting. It's expensive, but beats screwing around with a die grinder.( No offense to Barry R.)To check final clearance level head and block with piston at TDC and pour hot wax thru. plug hole.Take head off and you can see/measure thickness of wax. My thanks to Jay Brown for making me aware of R&R. Good luck.

I've had them all, and just can't get any better service, capability, or ring land tolerance than I get from CP. I'm sure the other stuff is okay, just giving my opinion. I don't use anything else anymore. Rick can make just about anything I can supply the info for. No matter who makes it, a guy should do like Barry mentioned and test fit it. If you don't have that .040 of clearance, it can beat the bearings out of the engine and you won't ever know until it really tells you.

Diamond (and others) can take a head or a mold and CMM it to generate an exact mirror of the chamber. I've had that done on my CNC stuff - Blue Thunder and Edelbrock. But a true custom piston costs more money (+/-200 extra) than a tweaked catalog part - for those that are counting their nickels on a modest build its a safe place to save.

Barry Rabotnick
Survivalmotorsports.com

.... Thanks to all. It seems XR7 has a dome that is interesting. I will call Diamond this morning and talk to Eric, assuming he's there!

Thanks again,
Dave.