[blue71ta]

anyone know how many '70 GPs came with the 455 engine?

[Held for Ransom]

There were 68,750 GP's produced for 1970. Of those, 12.5% came with the 455 engine. I don't know if there is an actual number.

[blue71ta]

So approx 8,600 with the 455 then.

[PONTIAC LARRY]

Used to have a 4 speed coded 70 GP HO block..pretty rare

[Old Goat Racer]

I have a '70 455 HO block. But the car is long gone.

[428ho4spd]

Originally Posted by blue71ta

anyone know how many '70 GPs came with the 455 engine?

1970
Given the success of the '69 Grand Prix, Pontiac would have been foolish to change much for 1970. With that in mind, exterior updates were limited to smaller details such as grille and taillight textures, and the repositioning of exterior trim. The interior was essentially carried over, but a bench seat was now available as a credit option, and only with the Turbo 400.
The 350hp 400 four-barrel was again the standard engine in the Model J, while the low-compression 400 two-barrel remained a no-cost option. The 428 engine from 1969 grew even larger for 1970. An increase in crankshaft stroke from 4.00-inches to 4.21 caused displacement to jump nearly 30 ci to 455. Although referred to in sales literature as "455 H.O.," the new 455 was similar to the 428 H.O. it replaced, but lacked the high-flow exhaust manifolds, and was subsequently rated at 370 hp. Transmission usage remained the same for each application.
An economic recession during this time had many new-car buyers searching for less-expensive models. And since most Pontiac offerings were slightly higher priced, Pontiac had fallen as far back as sixth in sales during the '70 model year. Grand Prix production not only reflected this, but it was also impacted by the competitive models being offered by other manufacturers. Total production fell to nearly half that in 1969 with just 65,750 units produced. The Model J represented 60,165 of that total while the remaining 5,585 units were SJs. Pontiac's 455 four-barrel engine was installed in 2,665 Grand Prix Model Js at a cost of $58. And manual transmission-equipped Grand Prixs totaled just 500 units.

[blue71ta]

Great, thanks for the info

[Pontiyak]

Grant, do you know the breakdown for J and SJ in 1969 ?
Thanx Dave

[428ho4spd]

Dave, here's a link to the full article with more production numbers for '69 to '72 GP's.

http://www.highperformancepontiac.co...ac_grand_prix/

Grant

[Held for Ransom]

Didn't even notice I typed in the wrong total. Thanks for the updates.

['ol Pinion head]

Know where there is a secluded yard with several builder '69 & 70 GP's. All have been in the sell as a whole vehicle area for nearly 30 years & the hail storms have pretty much done their damage. One of the long setting '70's has SJ trim, yet it has a 400 2bbl with an 8.2 Pontiac 10 bolt. I've popped the hood & jacked up under the rear & its stock. Have had a bunch of '69-71 SJ GP's, a few '70 455 J's, & own a 428HO '69 model J. Have looked at thousand more, & have never ran across such a deal on a '69 or 70 SJ. Do not have access to '70 GP order sheets, was there a economy engine choice, like in previous years, an engine option that would have been a credit on the invoice? TIA

[428ho4spd]

WOW, I'd like to see that yard! Any stick shift cars in the bunch?

Maybe someone put the SJ emblems on it, or swapped out the 455 and 12 bolt rear. Yes, in '69 & '70 you could opt for the 400 2bbl, but I believe it was only available on the Model J as no extra cost option. All of the 2bbl GP's I've seen (a handful) were Model J's.

I'd like to hear more about your '69 HO car, colors... options? Photos!

Grant

[Pontiyak]

I too would like to hear of this yard.

As well on info on your HO cars.

Dave