FAQ |
Members List |
Social Groups |
Calendar |
Search |
Today's Posts |
#101
|
||||
|
||||
Dennis. Congrats on getting the car out. You and your brother really do some top notch work, and it shows. The car is beautiful and those are great et's for what all your working with. I think now its time for you to and Dan to go head to head. Tempest vs lemans 455ho post coupe war! Have a good one.
__________________
1970 Formula 400 4 speed 2006 Gto. Ls2/m6 1972 Gto 455ho/th400 post coupe 1973 Grand Am 400 4 speed |
#102
|
||||
|
||||
Dennis , beautiful car and great performance . Love the color and being a post car what's not to like . What compression and casting number heads were on the 70 400 T37 ? Number 12 being the ram 3 head . Thanks Mike K
__________________
505 CID, 3560 lbs,Tiger heads, NA. 8.99@149.8 mph, 1.29 60', stock suspension |
#103
|
|||
|
|||
Quote:
Dennis |
#104
|
|||
|
|||
Quote:
Dennis |
#105
|
|||
|
|||
Quote:
Dennis |
#106
|
|||
|
|||
Quote:
|
#107
|
|||
|
|||
Quote:
Dennis |
#108
|
|||
|
|||
Quote:
My 72 Lemans with 400 .030 over, 068 cam, cast iron intake, log manifolds, HO racing carb and distributor kits, dual snorkel, crush bent quiet exhaust, 3.55 12 bolt, 200 4R does a best 1/4 mile on my dragy of 14.59 at 95. Going to upgrade to a 2.5" Pypes mandrel system, which sounds like a huge improvement. What would I gain by going to ram air manifolds over logs? Wondering if its worth it. Kent |
#109
|
|||
|
|||
Quote:
Your 400 will be quicker by 0.1 to 0.2 seconds (I think Ccass mentioned this earlier in this thread) quicker with just the manifold change and you'll get another .0.2 to 0.3 second drop with the full mandrel bent Pypes exhaust system. Dennis |
#110
|
|||
|
|||
Quote:
My goal is to be faster than my wife's Mach E in the 1/4(13.8)! Fun! What is the next step without just going to a stroker? From reading posts maybe 2801 or 2802 cam? Worth it over the 068? 3.73s might be nice over the 3.55s since I have overdrive.. But the 200 4R does have a much lower 1st gear than a T350 or T400. Kent |
#111
|
|||
|
|||
Kent, Might as well ante-up for the 2.5" outlet RA manifolds since you are going that route along with the Pypes mandrel 'X' system. Can't go wrong there and it will support more power down the road (up to 500 hp easily). I personally would get the kit without the mufflers and purchase the 18" case DynoMax UltraFlo's or Magnaflow's separately, which are both straight-thru design, yet fairly quiet, but support lots of power. I have both and they both perform very well.
I see you have #16 heads and I'm assuming the '68 large valve variety. I would certainly follow the same recipe we did on the XV 400 engine on yours. With the large valve heads with .040" quench, lower 10's for static compression, the 2802 cam, etc., I would expect an easy 420 hp/480 lb-ft torque. With your new exhaust system and a fuel delivery system to match, you should have no problems running high 12's at 106+ mph. I'd stick with the 3.55's for a while since your first gear multiplication ratio is 9.7625 with the 200R4's 2.75 first gear...that's like having 3.90 gears with a TH400/TH350! You will have a major traction problem with this build...and lots of fun! Dennis |
#112
|
|||
|
|||
Quote:
Would Rhodes lifters make sense with the 2802? Just thinking about retaining the nice Pontiac low end torque and drivability. Kent |
#113
|
|||
|
|||
I don't think you will need Rhoads with the 2802 cam and 10.0 to 1 compression in the 400. So far, we've never had any issues with the lifters that come with the Summit cam kits (supposedly Johnson Hy-Lifts), and I'm not a fan of their 'sound'.
Dennis |
The Following User Says Thank You to SD455DJ For This Useful Post: | ||
#114
|
|||
|
|||
Here is my current exhaust coming off the manifold. Look closely, nice crinkle near the clamp.
|
#115
|
|||
|
|||
Definitely room for improvement! With your new RA manifolds and 2.5" Pypes 'X' system you'll likely need to richen the carb a bit to compensate for the improved flow. Your times should drop to very low 14's and mph jump to 100+ after this...before the engine rebuild that is.
Dennis |
#116
|
|||
|
|||
I should probably add the .030 bore and rebuild was done by my local machine shop roughly 25 years ago. I gave him the specs from my HO racing book when he rebuilt it. It has less than 6000 miles on it since(I know should have been driving it and enjoying it more). Used a rebuild kit from Warrior.
Heads were redone with HO's springs if I remember correctly along with hardened seats. Ran them on the original 350 with the HO HC-01 cam for a while until changing to the 400. Should have kept that cam but sold it along the way. |
The Following User Says Thank You to KSZR For This Useful Post: | ||
#117
|
|||
|
|||
Quote:
|
#118
|
|||
|
|||
Quote:
|
#119
|
||||
|
||||
gosh - can you post a video of racing the mach E after you are done your upgrades...lol
good luck! |
#120
|
|||
|
|||
I did get a set of manifolds. Had to settle for 2.25", so sign of 2.5" available anywhere.
|
Reply |
|
|