Engine block options

Paulcovy

Paulcovy

Member
Hi all it appears my block is too worn and requires a re bore ..... can I use 9.75 pistons over sized .020 .... with my 10.5 block crank and rods?? Or do I need a block crank rods the lot ?
im fitting sd1 heads with the machines valve guides ect .... I would like to use my original block but the 10.5 pistons oversized seem impossible to get hold of
Thanks all
 
Your actual 'block' wont be worn, it will be the iron liners inside the alloy that are worn. You will need to know what size the liner bores clean up at , then the mechanic who does that can advise what oversize pistons are needed. As long as your crank is OK,you should be able to fit any of the available compression ration pistons. IMHO 9.25 (or 9.35) produce the sweetest engine for everyday road use, where the 10.5 produce a peaky engine lacking in low end torque. Assuming its a 3.5L version, fitting a 3.9L camshaft is a worthwhile upgrade.
 
jp928 said:
Your actual 'block' wont be worn, it will be the iron liners inside the alloy that are worn. You will need to know what size the liner bores clean up at , then the mechanic who does that can advise what oversize pistons are needed. As long as your crank is OK,you should be able to fit any of the available compression ration pistons. IMHO 9.25 (or 9.35) produce the sweetest engine for everyday road use, where the 10.5 produce a peaky engine lacking in low end torque. Assuming its a 3.5L version, fitting a 3.9L camshaft is a worthwhile upgrade.
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Not to mention higher priced and harder to find petrol when running with the 10.5:1 setup.

If you are missing the extra HP (on paper anyway) that the 10.5 ratio gives you could get some 3500S exhaust headers which should more than make up for the difference.

Graeme
 
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