The V8 Owners Forum -

Hi
I have these holes in one of my heads that I am fitting, anyone any idea of the bolt sizes I will need to blank them off?

Thanks

Fil

See, told you I was stupid!!!

Thanks

Fil

Hi

"One of the bolt holes at each end of the head is of a larger diameter than the same in the original P6 head."

How do you ovewrcome this? I take it the P6 cylinder head bolts are too small then to fit and the bigger bolts are too big for the block?

FIL

Thanks Kevin

Is that because the 14 head bolts worked with the Buick engine and heads? Just wondering really!!

Fil

So have the blocks always had 14 holes but only 10 were used to start with and then 14 and now back to 10?

Fil

Thank you very much Sidecar. Just as a matter of interest would I have the 4 outer holes in a P6 block if they are a later addition that has now been discontinued?

Fil

Hi Thank you again for all you help, I hadn't realised there was so much to consider! I only do about 1500 miles a year and and rarely rev above 4000 and that would be overtaking! I have a spare set of tin gaskets that came with the car and think I will use them, it sounds a lot easier! I think they...

Hi TC

Any idea of how much I will need to have them skimmed or do I put the heads on and measure the preload? Then see if they need skimming?

Fil



TC

Thank you Sidecar, guess I will know when I take my old ones off.

Fil

Hi
If I get some SD1 or 3.9 heads and they don't have the rockers, pedestals or push rods, can I use the ones off my P6 heads?

Thanks

Fil

Hi Kevin

I do have 10.5/1. Sorry but why is it helpful? Am only asking 'cos i don't have a clue!

Thanks

Fil

Well it seems to make sense, save carrying lead addative around and trying to work out how much to put in!
Fil

Hi Poo Slinger

Have sent you a pm to see if we can get something sorted out.

Fil

Hi

I'm in Billinhay so not far away.
Fil

Thanks for the replies. I should have said that the only reason I am changing the heads rather than putting new valves in is so that I can use unleaded petrol. Also the later heads have bigger valves so I thought I might get a bit extra power as well. The engine is a standard P6, no fancy bits and t...