my delapitated 429 mtr arrived today. so now it is time to put together this monster.the bore is std so the first step has been positive.my plans of attack is to have the block cleaned and bored to +30 dummy fit up the crank and pistons and check the piston to deck height, pistons are a probe forged 26cc dish and the heads are cj series alloys with a chamber of 72cc i want to gain maximum comp but be able to run on premium.should i just have the block skimmed during the bore process. or dummy it up and spend the extra time getting it spot on. these pistons with this combustion chamber are supposed to give a comp/ratio of 10.5 -1. what are your thoughts. i am running a solid roller as well but have left the specs at work. it is a comp cams custom grind from animal jim racing in the u.s. he is renowned for his work with these engines and has been very helpful thus far. your thoughts and criticisms needed and appreciated riest:
You need to do the dummy up,but fit a piston to each corner and measure.I was told the blocks aren't always square so different amounts may need to be taken off the block ,if that makes sense.The 2 i did recently were pretty square but it pays to check. Take the time and you'll be much happier with the results.
As Greg said, When i had my block bored i got them to check the line bore (fine) and the decks for square so i wouldn't have to deal with any more block machining , both sides ended up needing a light skim to correct.I can just see the original surface at one end of the decks due to to them not being parallel originaly ,its also a nice new surface for the head gaskets to seal on.
MAX comp on PULP?
Reese Since your going to spend the time doing it right try Reading THIS ARTICLE on dynamic compression ratio and how to calculate it riest:
hers a snip it.
Pat Kelly said:
Dynamic Compression Ratio (DCR) is an important concept in high performance engines. Determining what the compression ratio is after the intake valve closes provides valuable information about how the engine will perform with a particular cam and octane.
You need to do the dummy up,but fit a piston to each corner and measure.I was told the blocks aren't always square so different amounts may need to be taken off the block ,if that makes sense.The 2 i did recently were pretty square but it pays to check. Take the time and you'll be much happier with the results.
gregaust that does make alot of sense, i did not even give that a thought.
302 i am off to look at that now cheers.
dodge i have the cam specs here 744i 727e 260/270@050 110 degree jim feuer in the u.s supplied it for me. these engines are his forte. and has been quite helpful he is a retired pro drag racer (what a job).he has supplied this cam after i painstakingly gave him every last detail of what i had and wanted.as for fuel costs that will be the cheapest part of the car. i know ive gone a bit overboard on this engine but itll be fun to hang onto. i still have my original engine 460 so i may as well. im off to the w.s.i.d bracket meet today i bought a carb off a guy last week who has his capri 514 bb ford entered today. he switched to injection. runs consistent 9.01 he is hoping to break into the 8 barrier with his new setup. i will be happy to run in mid 11 consistently that is what im aiming for. riest:
As Greg said, When i had my block bored i got them to check the line bore (fine) and the decks for square so i wouldn't have to deal with any more block machining , both sides ended up needing a light skim to correct.I can just see the original surface at one end of the decks due to to them not being parallel originaly ,its also a nice new surface for the head gaskets to seal on.
MAX comp on PULP?
Reese Since your going to spend the time doing it right try Reading THIS ARTICLE on dynamic compression ratio and how to calculate it riest:
hers a snip it.
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