Thanks Larry. I should have said if one was to do a rebuild, just based on blocks alone - am I better off using the 73 versus the 70 block ? I have both now, and plan to build a 455 for my GS350, so may as well use the best of the 2. Thanks
I see you are relatively new here. Let me give you some reading to do. http://www.v8buick.com/index.php?threads/what-year-big-block-buick-to-build.120037/ http://www.v8buick.com/index.php?th...ck-why-sonic-checking-is-so-important.171953/ If you are contemplating building a 455 short block, do not buy the current off the shelf pistons. Spend a bit more and get custom pistons. They offer a lot of advantages. Read this, http://www.trishieldperformance.com/470--what-and-why-.html Some info on Piston availability, http://www.v8buick.com/index.php?threads/470-vs-482-differences-similarities.327964/
The quad on the intake is 7044....so I know the quad is a 1974. I can’t find a vin code on the block at front below drover’s head....pad appears blank. Here is a pic by the dip stick tube. The build date is k23 - so November 23rd. Assume year is 1973?
When you say rebuild are you staying stock or are you going to go for serious power? For just a rebuild it shouldn't make much difference which block you use. Bob H.
Thanks Larry - I found the vin...its 44H434803......so a 1974 block The turbo 400 that came with it is a 70-PA The goal for the build is 500 plus hp, low 12's....Thanks for the reading material! Look forward to it.
PA came behind the 1970 Pontiac 455 HO. Should be a good Transmission. That will be no problem with a set of TA Stage1SE aluminum heads with entry level porting, 10:1 compression, and a cam with 230* of intake duration.
In good air it should run high 11s. Ive gone 12:30 109 9.3/1. 230/236 comp cam small valve 73 heads bowls opened only. Performer and 850 annular. Junk t400 trans which is now on floor of garage and 342 gears.
I'm surprised. P = Pontiac, A = specific model. Typically the "A" is a very popular, high-production, lower-torque capacity "grandma/grocery-getter transmission". I'd have expected that the HO would get a "higher" letter ID--lower production volume, extra torque capacity. FIFY Always a good idea with a quench-style combustion chamber.
Cliff Ruggles told me that the pre 72 turbo 400s - at least 69 and 1970 are very similar cores for performance rebuilds. Thanks everyone for the zero decking recommendations - I’ve got that requirement logged.
I have a 1969 turbo 400 PX code from a Pontiac 400 4bbl gto or firebird ...or the 1970 PA code .......which would you rebuild?
I'd expect the PA to have a medium-length tailshaft, and the PX to have a short shaft. Which length works better for you? Somewhere, there's a guide to the number of clutch discs in the various clutch packs. The "A" is likely to have fewer than the "X", so you might want to give preference to the "X" if the tailshaft works for you.
