My '68 GTO

unburt · Guru

RE: My '68 GTO

455gto · Poncho Master!

Nice 1968
I put in a comp cam to my yellow 400 GTO
It's a 51-232-3
                                           2008262

Cam spes---- int exh
adv dur         268 268
dur@.050     215 215
valve lift      .454 .454            lobe sep 110.0
I love this cam with #13 heads and headers.
As for the hole .....Drain the oil and see if you have any peices on the plug and look at the filter. SD Performance aslo sells a valley pan brace.

427carl · A Poncho Legend!

dualquadpete · Canadian Poncho Superstar!

Thats definatly not the way that block should look!!! You can see the broken edges around the bottom of lifter bore, oil return hole is now a broken piece of block & you usually can't see that much of the cam & lifters??? Think you have a "MAJOR" problem here, no STRENGH IN THE VALLEY AREA!!!!!!!!!!!!!!!

davelacourse · Poncho Master!

I have never had a Pontiac motor apart so I am no expert for sure, but the few pics I was able to find on the internet looks like you have more damage than just that one jagged hole in the front wall:

This is a blowup (2X, sorry it is a little blurry) of the above photo, same area as your picture

Agree with Pete - hope you can repair but I would want a real expert to look at it first, as costly and time-consuming as it is to replace a block, better that than have it blow up on you, is my opinion.

Sorry,
Dave

68sd · Canadian Poncho Superstar!

68sd · Canadian Poncho Superstar!

unclebernie · Guru

I recieved a message from a guy on another forum he stated that he has had the same casting break at the back of his block for 30yrs, and he is still beating the crap out of it. The hole is in the rear wall near the distributor, and as per 68SD's pics that is how much of the lifters and cam you see on a Pontiac motor. I am not able to get back at it until fter the weekend, so I will finish ripping it apart then and see if I come across any more damage.

Thanks guys.......

87 player bird · Poncho Master!

I swapped my block out with less damage so if i wanted to rebuild the #'s engine I could. If you rebuild, and then bag on it the next time could be terminal. In my experiance, The pontiac's are really torquey, but DON"T rev 'em above 5-5500 rpm at the highest. They dont like high rev's unless you spend a TON of dough. My camshaft broke in 3 pieces, and took out cyl# 5 when it let go. Just trying to save you some heartache later. I used a 70 400 out of a t/a. Had to modify the pass motor mount as the blocks changed in 70. P.m me if you want any idea's.