624 HP Blown 383 on the Dyno - Lateral-g Forums

**GregWeld** · #1 05-29-2011, 06:50 AM

I'm re-doing my brother in laws Pro Street '69 Camaro... and had this motor built for him - using his blower and some parts I had laying around. It made 581 TQ @ 4500 and 624 HP @ 6300.... and idles like a stocker. Not bad for a pile of spare parts. I had the block and crank... and the Canfield 220 heads with T&D Machine shaft rockers. Roller cam... H beam rods - Mahle pistons.

**Flash68** · #2 05-29-2011, 12:01 PM

How many lbs boost?

If those were your T&D shaft rockers laying around, I wish I knew you had had them!

**GregWeld** · #3 05-29-2011, 12:10 PM

Quote:

Originally Posted by Flash68

How many lbs boost?

If those were your T&D shaft rockers laying around, I wish I knew you had had them!

Yes they have been laying 'round looking for a good use for 4 or more years now... however - they would not fit a standard set of heads - they were 450 offset arms for the big Canfields valves...

**GregWeld** · #4 05-29-2011, 12:13 PM

**GregWeld** · #5 05-29-2011, 03:41 PM

Dave -- You may or may not have read my post about it not being my first goat rodeo ---- and some comments I posted about a motors "rate of RPM"....
My 406 is done NASCAR style - Honda rod journal size - small rod end - with the reduction in reciprocating mass....

So check out the two dyno sheets comparing my longer arm 406 and the blown 383 - the FAR RIGHT column that shows RPM Rate of increase -- and compare it against the 383's.....

MY 406 8 stack:

The Blown 383:

**Flash68** · #6 05-29-2011, 10:19 PM

Quote:

Originally Posted by GregWeld

Yes they have been laying 'round looking for a good use for 4 or more years now... however - they would not fit a standard set of heads - they were 450 offset arms for the big Canfields valves...

That's right.. forgot they are head specific.

Quote:

Originally Posted by GregWeld

Dave -- You may or may not have read my post about it not being my first goat rodeo ---- and some comments I posted about a motors "rate of RPM"....
My 406 is done NASCAR style - Honda rod journal size - small rod end - with the reduction in reciprocating mass....

So check out the two dyno sheets comparing my longer arm 406 and the blown 383 - the FAR RIGHT column that shows RPM Rate of increase -- and compare it against the 383's.....

I read something somewhere about your wishing to use some tools... or something like that.

Did not read about rate of rpm... but am interested? Which thread if you don't mind? I didn't know your 406 was built in such badassedness style.

**GregWeld** · #7 05-30-2011, 05:11 AM

Quote:

Originally Posted by Flash68

Did not read about rate of rpm... but am interested? Which thread if you don't mind? I didn't know your 406 was built in such badassedness style.

I don't remember what thread it was in -- but the gist of the comment was that I spend a fair amount of time hanging around my buddies dyno... and that we "talk" a lot about these various motor builds. One of the things I'd learned was to pay attention to the "rate of rpm increase" -- not just the HP/TQ numbers. Sometimes Rick makes comments about a motor being "lazy" - or about how killer it's going to be so asked him to explain that to me.. and the rate of rpm increase was a 'clue' to the other aspect of an engine build that is important.

That - of course - like most engine building - is based on many factors - reciprocating mass - head/port sizes - and on and on.... The motor in the Nomad was built with this in mind... and the best description of that motor is "snappy". The lightweight reciprocating mass - and the small Dart heads - and the IR intake adds up to a pretty quick rate of increase. Makes it super fun to drive! Torquey and super 'responsive'.

**WSSix** · #8 05-30-2011, 06:57 AM

snappy and responsive is what I want out of my engines

I'd love to build a snappy and responsive LT1. I know I know, it's an outdated engine. I love the LSx engines but I'm tired of seeing them honestly. I'm a huge fan of being different and the LT motors. So I figure I'll build the LT so long as I can do so without breaking the bank. If only money grew on trees.

Good job on the 383 Greg. Those are nice numbers.

**GregWeld** · #9 05-30-2011, 07:32 AM

Quote:

Originally Posted by WSSix

snappy and responsive is what I want out of my engines

I'd love to build a snappy and responsive LT1. I know I know, it's an outdated engine. I love the LSx engines but I'm tired of seeing them honestly. I'm a huge fan of being different and the LT motors. So I figure I'll build the LT so long as I can do so without breaking the bank. If only money grew on trees.

Good job on the 383 Greg. Those are nice numbers.

Thanks! For a 'cobbled' together (somewhat) bunch of parts laying around... it will make a very nice street motor for him. At 7 lbs of boost - it'll live... and it has good stuff for guts. Forged crank - H beam rods - Mahle pistons - special Crane cam (harder core with pressed on gear) - the Canfield heads with the raised port can use the air the blower is pushing down it's throat... and the shaft rockers are stable...

Typical hot rod style -- I had a block and crank.... only planned to buy rods and pistons etc... but the block I had was already .060 over... no good for a blower build... so swapped it for a std block - but then had to clearance etc -- and the crank I had laying around was the typical 383 (EXTERNALLY balanced)... given the blower motors don't use balancers -- I had to buy a crank that was INTERNALLY balanced... then the heads which were ported and 'ready to go' needed to be milled and the valves were too short to use the shaft rockers... so they had to be done over... Then the intake manifold wouldn't cover the raised port heads - so it needed to be "added to" and machined....

SO my "we can do this cheap with all the parts I have" - ended up in typical hot rod style -- $$ Oh well WTF....