I have a 1968 Le Mans the heads are off can I just measure the bore and tell if it's a 400 small block

Asked by Aug 28, 2012 at 03:16 AM about the 1968 Pontiac Le Mans

Question type: Maintenance & Repair

One of the heads are cracked and I need to get a set but first I need to know what I have that way I know how much I should put into it. I mean if it is a 400 then i may get a set of alumininm heads. or whatever may work best.

6 Answers

2,815

there is a number between the middle cylinders and there are charts on web sites to tell you what kind of head you have

2,815

could also be a leter number combo i know i had (16) heads on my 68 gto, which was right fot the numbers matching wt engine that was in the car giving that 400 engine 10,75 to 1 compression ratio

17,245

You could measure the bore. A 4 in. Bore is going to be a 305-350 and larger could be a 400 but im not sure on the number for the 400.

if its a pontiac engine the size is stamped on the side of the block.

check out www.yearone.com for engine ID numbers.

3,105

if you want a used set of heads or other parts check out www.frankspontiacparts.com

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