[b-man]

What cubic inch displacement or engine size is in your street V8 Pontiac?

If you have a serious Pontiac problem and own several street Pontiacs, just choose your favorite if there is such a thing.

Choices:

455

428

421

400

400 with stroker crank

389

350

326

301

Aftermarket block

[PunchT37]

Iv`e got 3 Pontiac engines. They happen to all be 455`s. Does that mean I`m sick?

[Matt Meaney]

as a believer in better living through cubic inches, they all end up with 455's eventually.

[b-man]

I thought I'd try out a 421 for a change, partly for the sake of nostalgia (it matches the year of my car) and partly because I've already enjoyed some 455s.

Something about that 4" stroke intrigues me, a great mix of RPM ability combined with excellent torque.....

[tom s]

366!

[RocktimusPryme]

Ive got a cookie cutter 400 stroker. But hey when it got damn close to 600/600, I dont mind being generic

[Tom Vaught]

455 WITH E-HEADS CURRENTLY AND BG HOLLEY 6-PACK

Tom V.

[gata79]

3 535's. Yes it's a sickness.

[72LuxuryLeMansLa.]

Originally Posted by PunchT37

Iv`e got 3 Pontiac engines. They happen to all be 455`s. Does that mean I`m sick?

You are sick........But it's got nothing to do with cubic inches!

[Radman]

Gee! It looks like I am the only person running a 389. How is that possible. It is .040 over so it is a little bigger than a 389. Also you do not have the choice for the 195 that fits in the early Tempests.
My list.
1. 62 Tempest with the 389 that I mentioned.
2. 62 Tempest with the 195.
3. 03 Gran Prix GT with the 3.8.
Thinking very hard about pulling the trigger on a 63 Tempest with a 326.

[GRX]

400 std bore built with a virgin 4-bolt 1970 block.

What? No 265 choice option?

[Chicagogoat]

.035 over 455 combo makes it 463" originally built in the very early 2000's

I will go out on a limb and predict that 455's rule the roost on the street by and large despite 400 strokers being all the rage in recent years.

[Jack Gifford]

Hey b-man... how come you left out all the other Pontiac displacements? 195, 265, 287, 303, 316, 336, 347, 366, 370, etc.

For street- I've got a 3.56" stroke 382, and a 4.25" stroke 467.

[b-man]

To everyone asking why their particular engine displacement or why every displacement Pontiac ever produced wasn't included in the poll, please understand that there can only be ten choices in the poll as dictated by the forum software.

I chose the most common and popular V8 engine sizes to try to get a snapshot of what engines are being used by most Pontiac hobbyists. The less common older V8s and race-only V8s as well as four and six cylinder engines weren't included for now obvious reasons.

[Hillard]

Originally Posted by PunchT37

Iv`e got 3 Pontiac engines. They happen to all be 455`s. Does that mean I`m sick?

Yep...why so small?

501 in the making here.
Some day I'd like to have a block made w/ bigger bore spacing and a pair of DCI's RAV or some Visner heads to match. Something close to 650 inches would be nice.

[firechickenman]

455 in mine and my old 400 in the wife's T/A with her numbers matching 400 on a stand in the corner. An IA-II aluminum block in on my wish list!

[craigs69]

469 cubes here.

455 block, 4.19 bore x 4.25 stroke

[Half-Inch Stud]

I came across a TECHNICAL ANALYSES on the 1/4mile calculator of grand folklore. It stated that the analyses is completely keyed to the 60' times and the weight. It mentined caveats on tirbos, nitrous, and similar late come-ons. Then went to prove their matter with math.

The analysis concluded with a prediction list from 16sec ET through 8 second ETs predicated on 60 foots from ~2.4 sec(me thinks) to ~1.15(me thinks).

WELL, if that was it you'd be gypped by this Post. Sooooo,it went to describe a "metric" generated within the analyses that assigned a technical "acceleration metric" essentially based on the vehicle weight/engine HP & drive ratio. Let's say that metric value was "180". then it went to claim that a smaller engine with same HP & more gear could not do better. That it could only do better if the metric was moved to "200", because the gear removed the vehicle acceleration. That which the metric favored a larger engine.

I've moved from 350 CID to 428 to 455 (469 to be precise). Could be a matter of Stroke, then Bore/Stroke ratio..
All the meanwhile, I've found the 400 engine to be the most fun to Street & highway drive. Something about the throttle manners with a Q-JET.

Only my 2-circuit 1050 has come close to Q-JET throttle manners for fun driving.
Heck even the OHC6 is fun with the Q-JET.
Time for a carb type, Fuel-Inj poll HIS

[Old Man Taylor]

I answered the poll wrong. I clicked 428, but I should have clicked 400 with stroker crank.

[Gator67]

I have a couple 400's, one stroked to 462…which I like it a lot. But I have good reasons to believe the 535 going into my '70 Formula will be my favorite.