460 with 8:1 compression
#1
460 with 8:1 compression
Well I looked up the specs for my '77 460. Turns out it only has a 8:1 compression ratio. Ouch! I was hoping for something around 9 or 9:1. It has the stock D3VE-A2A heads.
Is there any way to bump up the comp ratio to give me a little more torque other than milling the heads? I'd rather not mess with the valvetrain angles. I could find some D0VE heads?...Domed pistons?...
This 460 will be an occasional tow/hauler and needs to run on pump gas. I'll throw in an RV cam, but I've read from a few posts that I might not be able to fully utilize a higher performance cam due to the lower comp ratio.
Exhaust porting and headers will also be additions.
Thanks for any advice.
Is there any way to bump up the comp ratio to give me a little more torque other than milling the heads? I'd rather not mess with the valvetrain angles. I could find some D0VE heads?...Domed pistons?...
This 460 will be an occasional tow/hauler and needs to run on pump gas. I'll throw in an RV cam, but I've read from a few posts that I might not be able to fully utilize a higher performance cam due to the lower comp ratio.
Exhaust porting and headers will also be additions.
Thanks for any advice.
#2
Milling D3 heads won't raise it enough to make a difference and putting DOVE heads on without zero decking it will probably make it a pinger. One real problen with big blocks is the pistons are way too far in the hole. I used the 6cc dished 88-93 pistons, took .032 off the blocks deck, that put the pistons at around .005-.008 in the hole and milled my D3's to 95cc that made it close to 9.5:1
#3
mark is right. Im working on a build and already went through all these numbers my self.
I have a set of D0VE heads in my truck now. The engine is from a '70 Lincoln. I run 91 octane in it just fine with no pings except up steep hills. I would imagine this would be more pronounced if I were towing.
Anyways, the problem with the D0VE heads is that the difference is so drastic. It doesnt just bump the compression a little. My new engine will use the 95cc heads but my pistons are what will get me into the 9.5:1 neighborhood that I am after.
I have a set of D0VE heads in my truck now. The engine is from a '70 Lincoln. I run 91 octane in it just fine with no pings except up steep hills. I would imagine this would be more pronounced if I were towing.
Anyways, the problem with the D0VE heads is that the difference is so drastic. It doesnt just bump the compression a little. My new engine will use the 95cc heads but my pistons are what will get me into the 9.5:1 neighborhood that I am after.
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