I just started working on my 67 again and am working on the front suspension. The problem is that all the performance front drop springs are rated for either a small block Chevy or a big block Chevy and the Pontiac engine's weight is somewhere in the midle. So my question is which front spring should I use to give the poncho a 2 inch drop and the firm responsive ride of the performance springs? I feel that the small block springs will be too soft and the car will sit too low and wollow thru turns as stock springs do. But, I feel the big block springs will sit too high and if I were to cut them that the spring rate would be way too high for responsive handling, so what to use> Thanks in advance for any ideas.

i have this feeling that you are looking into hotchkis springs

i called hotchkis when i ordered my springs, both BB and SB are the same spring rate, just BB is about 3/4" taller when installed, in the same car

so i bought SB springs, and BB springs would have been 3/4" taller

i should have bought BB springs, it is very low, and my headers scrape over any bump

and from what i have heard a pontiac motor is not much lighter than a BB chevy

so I would recomend BB springs

I have the Hotchkis (sb) on mine to. It did lower it about 2 inches on my convertible. Unlike bastereo, I have the stock exhaust and don’t have any bottoming out problems. Also no problems with tires rubbing, but that’s due to it being a ’69. I also upgraded the front sway bar to 11/4 inch. Remember if you lower the front end you will have to shorten the sway bar end links.

Tom

From what I've read...

SBC = about 575lbs
BBC = about 675lbs
Pontiac = about 650lbs

Aluminum intake - 40-50lbs
Headers - 20-25lbs

And your looking at roughly the same weight as a SBC... or close enough. Just a thought?

Brett - 67 Drop Top 455 (that weighs the same as a SBC!)

I have Eibach springs on my car with a CHevy 350. They lowered the car about 3/4 an inch. I would think the additional weight of a Pontiac block would make the drop a bit more.

The spring rate is 500 and, coupled with poly T-bar bushings, the car turns very flat. My headers no longer fear railroad tracks or speedbumps.

Ok, thanks for the replys so far. I guess I should have stated that I run an iron intake and exhaust manifolds. The car is pretty stock looking but much better performer.So it looks like the big block springs might be the best?

I have the hotchkiss small block springs in my car, but I recommend you get the hotchkiss big block springs. It looks pretty slammed with the small block springs, as you can see from my photo.

Looks just right to me Dave! Looks good!

(But with the stock components... I'd venture to guess the BB springs would be best)

Brett!