| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
09-04-2020, 04:40 PM
|
|||
|
|||
building another 428
I am going to be building another 428 for a stripped down Tempest custom. planning on suspension upgrades. I want to build it a little more stout than the previous build which was a stock build. I have a 2 bolt standard bore 428 block. I am looking at 2 rotating assemblies from Butler to go along with a set of 16 heads with RA4 OEM valves installed, 7/16 studs and port matched to a RA4 gasket and performer rpm intake that I have. I have no crank therefore the reasoning of the complete rotating assemblies. I want to build a nice streetable engine. looking for the pros and cons of these rotating assemblies.
https://butlerperformance.com/i-3164...-4-250str.html https://butlerperformance.com/i-2445...-4-000str.html 433 assembly has forged crank which is probably overkill but is a 4" stroke Thanks in advance! |
|
#2
09-04-2020, 05:13 PM
|
||||
|
||||
|
I would pick a factory crank if you can find one over any offshore cast crank. If I could not find a factory crank I would go forged. I have seen too many chinese cast cranks fail.
You could run a factory 455 crank with a STD bore (4.151) 455 piston in the 428 I am a fan of the 4.00 stroke engines. I have never built one that did not run well. Depending on how much HP you want to make the build can vary. I have a combo in my dads 67 that runs great on the street. 428 .030 with forged flat top pistons. ARP main studs Super Duty Rods (Engine was built in 1996 so not as many options as today) Now I would go H Beams for the money. Factory 428 Crank prepped, polished throws and counter weights. Ultradyne Cam 238/244@.050 with a .480 lift, 110LSA 106ICL #62 heads ports cleaned up 1.5 Roller Rockers 1966 Tri Power Flowtech headers Engine made 475 HP and is very mild to drive. What area are you in?
__________________
66 GTO Nostalgia Super Stock/Street Legal Car 421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99 Multiple NSCA/NMCA World Champion 66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles 67 GTO 2dr Post, 428, Tri Power, 3.55 Gears 80 Trans Am Black SE Y84 W72 WS6 |
|
#3
09-04-2020, 05:17 PM
|
|||
|
|||
|
428
The Tax capital of the world New Jersey!
|
|
#4
09-04-2020, 06:04 PM
|
||||
|
||||
|
Factory O.E.M. RAIV valves are 2 piece, Never heard a good word about them. Thinking you won't have a problem with them, won't make it better....
Just trying to help...
__________________
1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
|
|
#5
09-05-2020, 05:42 AM
|
||||
|
||||
|
Do not spend the money on buying and then stuffing RA4 Intake valves into your D port 16 heads!
While they show a low lift flow gain on a steady state flow bench test they cut down on power in a running motor with D port heads. They also have have a big dish on there face that cuts into compression!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#6
09-05-2020, 08:22 AM
|
|||
|
|||
|
valves
Thanks guys point taken. I'm learning as I go. My stock 428 was built with the help of all you folks on the forum. I couldn't be more appreciative of the advice.
That's why I'm back asking questions |
|
#7
09-10-2020, 05:57 PM
|
||||
|
||||
|
I am very biased towards the 4" stroke. It gives you power at RPM without having overwhelming torque on the bottom end. I also like the forged crank - as a matter of fact that's what I have, but I put it in a 400 block. The only time I ever used RAIV valves was to help drop my compression ratio down, and to get a longer stem to accommodate springs with a higher installed height.. They performed just fine, and none of them came apart. I still have quite a few of them, but not in my engine anymore.
|
|
#8
09-10-2020, 06:42 PM
|
||||
|
||||
|
I do have a fresh turned 428 crank if you can use. It's turned .040 on the rods and .030 on the mains. The late Greg Merrick had it machined for me years ago.
__________________
 Johnny US Army Retired1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
|
#9
09-10-2020, 06:46 PM
|
|||
|
|||
|
428
Thanks OMT, I am definitely leaning towards the 4" stroke with the forged crank.
Would there be any reason to believe the 4" would run cooler than a 4.25 stroke? A buddy of mine is having all kinds of heat issues running his fuel injected 462. I certainly don't want to go down the road he's on and get it run cool $$$. Thanks In advance |
|
#10
09-10-2020, 07:28 PM
|
||||
|
||||
|
I don't think it would be significant. I have a 505 in my racecar (same stroke as the 462), and it cools just fine.
|
|
#11
09-11-2020, 03:31 AM
|
|||
|
|||
|
crank
Thanks Johnny but I don't think it would be cost effective with the shipping.
Much appreciate the offer though |
|
#12
09-11-2020, 05:48 AM
|
||||
|
||||
|
Granted if your comparing Apples to Apples in regards to the ring width used a longer stroke motor will have more fiction.
I have confirmed that the oil temp does come up faster in such, but if your cooling system is up to snuff I have never seen more then a 5 degree temp increase in water temps up at steady high rev's above 5500.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
|
#13
09-11-2020, 10:00 AM
|
||||
|
||||
|
If you go with a 4.21 or 4.25 stroke, just know you'll need upgrades to trans & a stronger rear end. Even a near stock 455 will trash a stock TH400 & the 8.2 BOP rear end, if you get any traction.
A strong 428 will probably do the same. So, I'd just go ahead & plan for trans & rear end upgrades. |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
