Thread: P76 conversion yet again

Originally Posted by rovarat

G,day im in the middle of a p76 conversion and need some expert advice. I going to run 3.9 heads and water pump etc and need to know about drilling the hole to oil the top end eg depth size and where , and can I use the p76 push rods and any other info on this engine swap . please I know you have probably been through this before but please once more

Make a jig off a 3.5 block to guide you with a hand drill. I can't remember the size May be 6.5mm

Use rover or holden lifters with P76 rods.

Either step the dowels or drill out holes to make a Rover timing case fit.

Redrill the fly wheel

Make a ring adapter for rangie or disco V8 starter . Forget useing P76 starter as the solinoid will get a knock.

Alter engine mounts.

Rangie Sump and oil pick up fit.

EFI manifolds work well... P76 carby does not

Some changes to ancillery brackets as block deck height is 1" taller.

If it's a late classic you will have to run full gas or EFI set upto get certified. To run efi will need manifold spacers and a small body lift to do a neat job.

If you run p76 manifold you may need to change the thermostat housing so points to radiater. Not sure what I used now but was a common type found at Repco etc.

Hope this helps.

Tony

Thanks rangier rover I might attack the block with a drill tomorrow. At the moment Im still working out wether to use the rangey inlet manifold or make an adapter to run the p76 manifold with the rangey carbies .can you still get the spacer plates to run the rangey manifolds.
cheers rovarat

Originally Posted by rovarat

Thanks rangier rover I might attack the block with a drill tomorrow. At the moment Im still working out wether to use the rangey inlet manifold or make an adapter to run the p76 manifold with the rangey carbies .can you still get the spacer plates to run the rangey manifolds.
cheers rovarat

Sure can get spacers but if useing the CDs it is possible and cheaper to graft them onto the P76 manifold by cutting a rangie manifold up if you have a way of weilding it on

Tony

G,day tony I think I will adapt the cds to p76 mani probably
less drama sealing .I drilled the oil ways in the block today .
I made a jig with flat bar and tube but it was still nervy work
just have to drill the xtra engine mount holes then she is ready
for a rebore.

Originally Posted by rovarat

G,day tony I think I will adapt the cds to p76 mani probably
less drama sealing .I drilled the oil ways in the block today .
I made a jig with flat bar and tube but it was still nervy work
just have to drill the xtra engine mount holes then she is ready
for a rebore.

Rebore..... So you need new pistons? If you find P76 to dear as I have in the past . 2 sets of Holden starfire will work with a pin hole hone. They are flat tops but have a lower compression height and seem to work very well. Strong as

Tony

Thanks Tony i ended up buying 3.5 rover pistons , i worked out by the time ibought new pins and payed to get pistons honed it would be
6 of 1 and half a dozen of the other,i did track down a 2 sets of starfire pistons + 20thou very rare ,but mechanic said 30s would clean bore up better
Cheers Chris

Originally Posted by rovarat

Thanks Tony i ended up buying 3.5 rover pistons , i worked out by the time ibought new pins and payed to get pistons honed it would be
6 of 1 and half a dozen of the other,i did track down a 2 sets of starfire pistons + 20thou very rare ,but mechanic said 30s would clean bore up better
Cheers Chris

I hope you don't plan to run ULP as rover 3.5 pistons may be around 12:1 If you cc them to stroke and head chamber. They don't have enough meat to machine out to lessen compression. Put a Rover next to a P76 and dish of P76 is a lot deeper to compensate for stroke.


By the way Holden starfire 4cyl has same pistons as Holden 173... They are cheap and easy to get.
Tony

Yep sure are , the pistons i bought are only 8.13.1 and are nearly
identical to the p76 ones ,should run that crud they call fuel these days.The 3.5 i was running was 10.5.1 and the only fuel it liked was
98 v power , my dad has a 77 rangie with a p76 and it only likes v power, anything else and plays up.

Cheers Chris