Piston recomendations for a 4.1 "291" block

RATROASTER

RATROASTER

Davey
Joined
Jun 9, 2003
I scored a complete 4.1 291 block. ;)

I'm not going to go to crazy with this build. I'm going to use what stock 3.8 parts I can find, port the heads & intake and bore it 60 over for a big cube 6-banger. What pistons do you guys recomend. I want to stay under $500 for the set.

Also do the 4.1's use a different water pump from a 3.8?

Thanks,

Dave
 
You can get sealed power .030" over for a 3.995" bore and leave enough for a 4.00" build next time-i believe the water pumps are the same some covers have bolt holes for a 14 bolt oil pan,some for 20 bolt oil pans and some aftermarket ones have for both bolt provisions.
 
pistons

The machinist that checked my block said the max is 60 over. He likes to stay below that or 40 as max. He also recomends Silvolite which are made by kieth black and are used in differant race classes or the speed pro. Both are hypers. I'm going to use which ever is cheaper.
 
I checked out Summit and I saw I can get Federal Mogul Speed-Pro Hypers for $43 a piece. I'm not a track star and I usually only look to make moderate power increases, but never the less I salivate over the opportunity to drop a punched out 4.1 in my last NA Regal. :) See if this link works for the Summit pistons:

REGAL, 4.1L/252, BUICK, 1983 - summitracing.com
 
better tag along for this. thinking about doing a 4.1 or maybe even a stroker:cool: if I ever get the car back together;)
 
RATROASTER said:
I checked out Summit and I saw I can get Federal Mogul Speed-Pro Hypers for $43 a piece. I'm not a track star and I usually only look to make moderate power increases, but never the less I salivate over the opportunity to drop a punched out 4.1 in my last NA Regal. :) See if this link works for the Summit pistons:

REGAL, 4.1L/252, BUICK, 1983 - summitracing.com
Click to expand...

i believe the pistons you want to use are the STL-H471P part numbers and those are $32.00 each.
 
I've done an extreemly thorugh search for pistons for my 4.1 project and currently no manufacture makes a forged piston except by paid request. only custom work and it's around $1200 to $3000 to get what I'm looking for. I looked for about 6 months so if you find some TELL ME PLEASE!!!!
 
charlief1 said:
I've done an extreemly thorugh search for pistons for my 4.1 project and currently no manufacture makes a forged piston except by paid request. only custom work and it's around $1200 to $3000 to get what I'm looking for. I looked for about 6 months so if you find some TELL ME PLEASE!!!!
Click to expand...

We can supply you with pistons custom built for your application for much
less than that giive me a call if you are interested .
 
KB Forged Pistons

After researching Keith Black website, all I find available for the 4.1 is the hyper pistons. RATROASTER, maybe your machine shop can shed some light on these KB forged pistons for the 4.1 they say are available.
 
I had JE make me a set of forged pistons for my 4.1 with a stroker crank. I filled out the custom piston form, and 2 months and
$900.00 later, my pistons were finally done and delivered with pins, spirol locks, friction coating, and file fit Moly rings. A long wait and a lot of money, but worth it.
 
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