I've read on the net a few months ago that the 1975 elite with a 460 was a good distributor to install on a mild 400 because of the weight inside. I can't find where i read this.
Now i want to buy that distributor but one came with single vaccum and the other one double.
What is the difference?
The 400 have dual plane perfomer 400 non egr.600cfm edelbrock 4brl. Manual choke. Aussie head with aussie pistons from Tim Meyer. Which one i need single or double vaccum? Thanks, Serge.

 

Use the single. Have you figured out the exact comp. ratio ?

 

Not exactly. Suppose to have 9.5:1.head were just shave for clean up and the deck also.the zero deck piston are 0.07 above the deck. Head gasket thickness save me.i talk to tim about that.its ok.

 

.007" or .070" positive deck? I figure .007 if head gasket, just one, fixed it OK... I like positive deck, can use cheap rebuilder head gasket and still get good quench effects..

 

sorry .007" past the block without the head gasket. Pistons .030" over. head gaskets are .040".

 

If your pistons are actually sticking out of the cylinder at all I am afraid you are going to have a problem with way too much compression. Like 11:1 ratio! IMHO.

 

i just calculate my cr with head gasket 4.08 bore, 0.038 compress, 4.03 bore, 4 stroke, dish piston 30cc, head volume 60 cc and piston to deck height -.007 .Give me 9.65:1 static comp with gtsparkplugs and 9.67:1 with summit racing calculator. i also calculate my dynamic comp of 8.29
i understand how to calculate compression but the dynamic compression # dont tell me anything. good or no good?

 

i used Compression Ratio Calculator | GTSparkplugs or http://www.summitracing.com/popup/ca...ion-calculator for static and http://www.wallaceracing.com/dynamic-cr.php for dynamic

 

I have a 435hp 400 with 9.5:1 compression. My flattop pistons were significantly down in the bore. I have to use water/meth injection to run decent timing. .080 is also not reasonable for boring. .050 is about it. Something doesn't add up. I don't mean to criticize, it just don't sound right. Stock 2v heads run 78/82 cc's as I recall. You would need a deep dish in the piston.

 

. ReRead please. OK, 4.080" is the hole size in his head gasket, not the bore size, which is 4.030".

. You have to use water/alcohol injection to control pinging/spark knock partly because you ended up with poor quench/squish with your pistons way down in the bore. Positive deck/near -0- deck is way preferable to that and the reason we use TMI/KB 351C pistons with their higher 'compression heights' instead of the poorly designed general 'rebuilder' pistons. He using Australian 2V 302" Cleveland heads with 60cc chambers and the TMI dished pistons recommended for those heads on a 400"/402"/408" engine...

http://www.crankshaftcoalition.com/wiki/Quench

. Personally, I am aiming for about 11:1 compression ratio and good quench distances with my next 400 build... will use an ounce or two of kerosene per tank of gas to control pinging if necessary... rather than H20/alky injection...

 

Well I hope that works out for him. Your not gonna run 11:1 compression on street gas even with aluminum heads and good quench.. Hopefully he will let us know. I've tried the "kerosene" solution, up to a quart. It doesn't help at all. The Snow injection system is tried and true.

 

. I'm already using a bit of kerosene in a couple engines, and it works perfectly, with just an ounce or two... most new performance cars are already running 11:1 compression ratio with aluminum heads and proper quench on pump gas premium right from the factory...:

http://www.corvettemuseum.org/specs/...S7_Drawing.jpg

. The kerosene may not work in engines with just plain horrible quench setup, I don't know...

 

You might be interested in the first couple of paragraphs on this web page.
Knock Knock

also no offense but modern engine are computer controlled, all aluminum and bear little resemblence to 335 series engines.

Don't get me wrong, I'd love to build a Tim Myers based 400 but my engine is much too new to replace.

 

Tim piston have better quench than original piston and flat top 351c. Compression height is down the hole too far compare to zéro deck Tim. The pistons i'm using(Tim for aussie head) have a triangular shape the same way the aussie heads have(like the 4v head). I couldn't find better pistons for my application.